The LEGATO cross-disciplinary integrated ecosystem service research framework: an example of integrating research results from the analysis of global change impacts and the social, cultural and economic system dynamics of irrigated rice production
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In a cross-disciplinary project (LEGATO) combining inter- and transdisciplinary methods, we quantify the dependency of rice-dominated socio-ecological systems on ecosystem functions (ESF) and the ecosystem services (ESS) the integrated system provides. In the collaboration of a large team including geo- and bioscientists, economists, political and cultural scientists, the mutual influences of the biological, climate and soil conditions of the agricultural area and its surrounding natural landscape have been analysed. One focus was on sociocultural and economic backgrounds, another on local as well as regional land use intensity and biodiversity, and the potential impacts of future climate and land use change. LEGATO analysed characteristic elements of three service strands defined by the Millennium Ecosystem Assessment (MA): (a) provisioning services: nutrient cycling and crop production; (b) regulating services: biocontrol and pollination; and (c) cultural services: cultural identity and aesthetics. However, in line with much of the current ESS literature, what the MA called supporting services is treated as ESF within LEGATO. As a core output, LEGATO developed generally applicable principles of ecological engineering (EE), suitable for application in the context of future climate and land use change. EE is an emerging discipline, concerned with the design, monitoring and construction of ecosystems and aims at developing strategies to optimise ecosystem services through exploiting natural regulation mechanisms instead of suppressing them. Along these lines LEGATO also aims to create the knowledge base for decision-making for sustainable land management and livelihoods, including the provision of the corresponding governance and management strategies, technologies and system solutions.
KeywordsEcosystem services Transdisciplinary research Paddy rice agriculture Biodiversity Rural development Culture
Society-nature interaction is a process in which a symbolic, cultural sphere (a system of recursive communication that may be denoted as “culture”) interacts with the biophysical sphere; that is, a system of physical objects that interact through flows of energy, substances or materials (Haberl et al. 2009, p. 1801)
The rapid changes in landscape management and land use in South East Asia (SEA) in recent decades (Fox and Vogler 2005), driven by forces of local and global change such as population growth, urbanisation, technological progress (e.g. mechanisation and high yielding crop varieties) and climate change, provide opportunities for improving livelihoods, but also produce threats, e.g. to food security (Ericksen et al. 2009; Godfray et al. 2010). Exploiting opportunities and establishing early warning systems for emerging risks is a plausible if not mandatory demand in this situation.
The LEGATO project has been designed to provide assessment tools for risks and opportunities in irrigated rice-based production systems. Due to the many and diverse linkages among ecological and social components of agricultural ecosystems, the challenges of developing meaningful system-scale analysis and target setting are amplified and trade-offs are acute. While for many single-sector ecosystem management situations targets and mechanisms for setting them are well established, this is much less the case for entire coupled socio-ecological systems, despite the undisputed urgency of developing appropriate approaches (Levin et al. 2015). To provide decision makers, from farmers to administrators and politicians, with the opportunity to explicitly consider how management options propagate throughout the human and bio-chemo-physical (for short in this paper: biophysical) domains of ecosystems, analyses suitable as basis for policy recommendations have to open the “black box”, revealing the feedback mechanisms, positive and negative, between processes and dynamics in the interacting social, economic, ecological and cultural dimensions establishing the complex evolving socio-environmental metasystem (Spangenberg 2014). This paper is, to the best of our knowledge, the first to describe the functional interactions between key components within the social–ecological system analysed in a harmonised fashion (for a definition of terms see the glossary).
This requires cross-disciplinary research approaches (a summary term for multi-, inter- and transdisciplinary research, see Morton et al. 2015) based on a broad set of disciplines from natural to social and cultural sciences to collaborate among and between each other and with stakeholders within a coherent joint framework. Economics and political science must analyse the processes leading to certain management decisions, human and cultural sciences explain not only if, or why not, such decisions are effectively implemented (Rosenthal et al. 2014), but also describe how modernisation processes, including commodification and urbanisation, erode indigenous knowledge about sustainable, low input agriculture, while natural sciences have to analyse how beneficial such practices could be from an environmental perspective (Seppelt et al. 2012).
Such a joint process requires integrating approaches, methods and knowledge across disciplines that are often based on different world views. The goal here is to demonstrate the benefits of such collaboration and show how progress can be made towards a synthesis by stepwise integration of multi-disciplinary results produced from studying multiple aspects of complex, dynamically changing agricultural landscapes (Förster et al. 2015) within a transdisciplinary project design. We illustrate the process drawing on the example of the transdisciplinary LEGATO project, and its studies of the ecosystem services (ESS) provided by rice agro-ecosystems in SEA (Settele et al. 2013, 2015), their generation and use.
ESS is a boundary concept (Görg and Aicher 2014; Hertz and Schlüter 2015) that is yet to develop as a theory, extending across disciplinary boundaries with so far diverging interpretations of its elements and differing terminology across disciplines and schools of thought (Mollinga 2010; Hauck et al. 2014). Thus, this paper builds upon existing ESS concepts to develop a joint transdisciplinary framework to aid communication, minimise misunderstandings, promote coherent use of terminology and enable synthesis of results—both within large transdisciplinary research projects, such as LEGATO, and in their external communication. Thus, the proposed framework should lead to improved management/stewardship of ESS (Boyd and Banzhaf 2007). It could also serve as a model for knowledge integration within other complex transdisciplinary projects studying ESS and related issues.
To achieve this goal, the paper follows the structure of the “ecosystem service cascade” (Potschin and Haines-Young 2011; Haines-Young et al. 2012), modified to also take human influences into account (Spangenberg et al. 2014a, b); such conceptual models have proven useful for understanding socio-environmental systems and synthesising diverse scientific information (Levin et al. 2015). It describes the co-generation of human benefits, starting with the analysis of biodiversity and ecosystem processes and continuing to biodiversity–ecosystem function (BEF) research, one focus of our work in LEGATO.
The analysis of these links is combined with social science results to understand the factors influencing the ecosystem service potential ESP (the use value potential attributed by society to an ecosystem function ESF) and then the generation of ESS and ecosystem benefits ESB. In summary, human agency and ESF co-determine the potentials identified, the services provided and the benefits enjoyed, and both must be analysed jointly to derive suggestions for improved land management which will lead to enhanced ESB and therefore will be likely to indeed be implemented effectively by stakeholders.
The first step of generating ESS and the benefits they provide is recognising the usability of ecosystem structures, processes and outputs, e.g. attributing a certain use option to a piece of land (Spangenberg et al. 2014a). This use value attribution transforms the ecosystem functions (ESF) into ecosystem service potentials (ESP) like arable land, construction materials and sites, or nature conservation area. By investing physical resources, energy and labour, and frequently money as a means to provide them, agents mobilise (part of) the ESP (in these examples, by ploughing, cutting/harvesting and building, or—less so in wet rice ecosystems—by fencing). Cultural and ethical or social norms, economic and legal constraints, and trade-offs between different ESP limit mobilisation (McShane et al. 2011). In some regions, such norms will be codified by legislation or regulations, while in other instances, norms may not be codified, necessitating additional social science research (Levin et al. 2015).
Many ESS are known to local stakeholders, but while scientists frequently describe ESS are as nature’s free gift to humankind, the beneficiaries often do not perceive them as free gifts, but as a result of co-production of humans and nature (Bengtsson 2015; Scholte et al. 2015; Jones et al. 2016). For both provisioning and cultural ESS, beneficiaries tend not to perceive themselves as passive recipients of “goods” or “benefits”, but as actively searching, and pursuing the generation of such services and their benefits (de Oliveira and Berkes 2014; own observations of several co-authors). Regulating ESS have often been experienced by stakeholders as natural conditions rather than as nature’s services, in so far as they do not require any human action beyond recognition by the beneficiaries, although they can often be enhanced by human intervention. Cultural ESS play a special role as they can be attributed to the objects representing the ESS, to the resulting ESB, but also to the processes of generating them, in the context of rice agriculture from joint decisions on the use of ecosystems to land preparation, harvesting, milling and cooking. Thus, different ESS are used in different ways (e.g. passively appreciated or actively enhanced in the case of regulating services, consumed for the provisioning services, and activated/actively enjoyed for sociocultural ones) to satisfy human needs and/or wants and thus to contribute to human welfare.
The ESS are appropriated to be directly consumed (fruits are picked), exploited to provide other goods and services (grain is harvested and processed, producing bread, rice cake, etc.) or marketed, resulting in (mostly monetary) income. Each of these options provides ecosystem benefits (ESB), albeit different ones (food, income); only in the latter case monetary values do play a decisive role (Spangenberg et al. 2014b; Spangenberg and Settele 2016). Human communities including the LEGATO rice farmers may have lived with (and unknowingly depended on) amenities provided by ecosystems for a long time, without necessarily perceiving them as services.
In the terminology used here, landscape management can be described as a series of anthropogenic interventions managing ecosystem functions, processes and outputs for the benefits of humans; however, it is society (or powerful parts thereof), not scientists, that define what are desired social benefits. So it is no surprise that the attribution, appropriation and the mobilisation phases are the ones when most environmental conflicts arise, be it for the destruction of the local environment, or the exclusion of people from the land they traditionally own or use. Other conflicts arise over the distribution of benefits from the mobilisation. Often these conflicts can be described as power struggles over the rights first to define the ESP on the basis of given ESF and then to mobilise the ESP and appropriate the kinds of ESS the local community or the farm workers wishes to enjoy as ESB, versus the services land owners, investors and/or governments intend to mobilise, appropriate and enjoy.
The complexity of the socio-environmental system makes any attempt to characterise the LEGATO results by cardinal measures of welfare futile. The fact that individuals differ in the values they hold implies that they will also differ in how they value benefits and trade-offs between different options. This demands a different approach, integrating diverse aspects and levels of ecosystem functioning and welfare generation. This is no shortcoming: stakeholders tend to prefer different metrics for different kinds of benefits, like money value for the results of marketing provisioning services and biophysical and social metrics for all other benefits (Ruckelshaus et al. 2015). Unlike welfare quantification, observing market mechanisms and their impacts is important to understand the dynamics of the socio-environmental system. For instance, in the case of undersupply of rice or any other ESB, price will tend to rise, creating a strong incentive to increase the volume available. The usual way of increasing the volume is to manage the ecosystem in a way that the ecosystem functions providing the basis for the service provision are strengthened. This, however, causes biophysical changes and may impinge on other ESS, valued or not. These feedbacks of market demand on landscape management and the state of the environment are one of the reasons why in LEGATO biophysical analyses are combined with sociocultural and economic assessments.
Different Work Packages in LEGATO address different “blind spots” of the processes linking ESF to ESB with different methods and based on different bodies of theory. Due to length restrictions applying even to an extended paper, it is impossible to comprehensively describe the theoretical backgrounds, methods, results and their interpretation for all modules in LEGATO; instead, a choice had to be made. In the fields of cultural and economic analysis, some more conceptual background is provided, as many readers may not be familiar with the respective theoretical background and the methodological approaches. In exemplary cases methods and results from scientific analyses are presented, as illustrations of up-to-date fieldwork, desktop analysis and conceptual developments.
Research approaches: combining ecogenic and anthropogenic factors
A core task of LEGATO (Settele et al. 2013, 2015, this issue) is to analyse and (where possible) quantify ecosystem functions (ESF) in irrigated rice landscapes of South East Asia and the multiple ecosystem services (ESS) dependent on them. The project is unique in analysing (1) provisioning services (harvest, nutrient provision), (2) regulating services (biological pest control and pollination—the latter, as LEGATO is not restricted to study rice fields but deals with rice-dominated landscapes and the impact of land use in rice on ESF/ESS in the landscape) and (3) cultural services such as aesthetics and identity, and their interactions.
The studies conducted within LEGATO combine both natural and social science elements, analysing ecosystem properties, dynamic interactions of ecosystem elements, structures and natural processes, and interactions with anthropogenic influences (e.g. farming practices). These elements and their interactions (for instance, soil composition, natural weathering, the activities of decomposers) bring about the actual ESF, nutrient cycling, as an emergent property of the ecosystem. Recognised as usable/exploitable, nutrient cycling (like such biophysical functions in general) is the basis for the societal use value attribution defining the ESP, in this case “soil fertility”. By analysing system dynamics, natural science is able to identify theoretically sustainable levels and patterns of ESP use, understood here as modes of use not overburdening the ecosystem’s capacity to deliver ESS, e.g. the use intensity permissible in rice terraces without running the risk of degrading them. Different but also effective restrictions in the social system are analysed by social and cultural sciences, like traditions, ownership structures or incentives. All taken together, such an analysis is a complex technical and scientific challenge which to date can only be undertaken with partial success and often with a high level of uncertainty. Society’s institutional system (local or regional administration, farmers’ self-organisation, etc.) is then called upon to decide if the system configuration and its potential changes are concerns serious enough to justify the efforts necessary to avoid it, for instance by investing time, work and resources in maintaining and restoring rice terraces to maintain ecosystem functions and thus the services provided by mobilising the ESP based on the ESF. This can be a very different ESP than the initially cultivated one—in the case of rice terraces the aesthetic value (ESP) attracting tourists (EES) which generate income (ESB).
The scheme shown in Fig. 2 is designed to be general enough to integrate within the Ecosystem Service cascade (Fig. 1), like value attribution or exploitation, which can be described in a similar fashion and be integrated into a coherent overall project description (Fig. 12). In Fig. 2, the arrow from the ecosystem to the services does not imply a direct generation, but to illustrate to which of the services the factors and processes analysed contribute. The constitution of the potential and the socio-political process of defining on how to mobilise it have to take place between the steps, i.e. the steps of use value attribution to ESF, and of ESP mobilisation.
The LEGATO work is region-based but in order to derive solutions potentially transferable to other regions, the research is both cross-regional and cross-national with a total of 7 regions and 70 core sites. The regions, landscapes and sites analysed within LEGATO (see Settele et al. 2015; Klotzbücher et al. 2015a, b) are predominantly shaped by human activities and so are the ecosystems they host. Consequently, when analysing ecosystem structures and processes, and their emerging functions, both the ecogenic factors and anthropogenic inputs and impacts (e.g. land management determined by economic, political and cultural factors) have to be integrated.
LEGATO regions along orographic–climatic gradients and their categorisations reflecting a spectrum of land use intensity, structural diversity and cultural diversity.
Source: qualitative or semi-quantitative assessments by the LEGATO team
Classifications of the land use and land cover patterns in all study regions were carried out using SPOT5-satellite images (spatial resolution 2.5 m × 2.5 m, merged panchromatic and multispectral channel). The initial image classifications with Erdas Imagine were subsequently refined with eCognition (in the study regions with more complex landscape patterns PH_3, VN_3, VN_4) and ground-truth data provided by various project collaborators from all study sites (Burkhard et al. 2015). For the study regions’ locations and for further details on climates, land uses and soils, see Klotzbücher et al. (2015).
Addressing knowledge gaps: LEGATO research foci
Ecosystem properties and ecosystem functions (ESF), and the role of biodiversity
Biodiversity and ESS
Biodiversity features heavily in discussions of ESF/ESS. However, while most ecosystem functions and services which derive from them probably cannot be produced without elements and/or functions of biological systems, the role of diversity itself (the number of different genetic, taxonomic or functional biological units, as opposed to the material elements constituting it like timber or biomass), plays a limited role in assessment and valuation of ESF/ESS so far (Meinard and Grill 2011). Harrison et al. (2014) report from their comprehensive review, integrating a multitude of different, both, aquatic and terrestrial, ecosystems and habitats, that the majority of 530 studies testing for an effect of biodiversity on ESS found an increase in service numbers and/or quantities. Nonetheless, they emphasise that for conservation and management recommendations the understanding of the mechanisms behind these relationships needs to be improved. This is partly due to the lack of data across organisational levels from molecular diversity to the diversity of biomes, and to the constraints on resources for systematic monitoring. Lefcheck et al. (2015: 1) identified another obstacle, concluding that the “importance of biodiversity for the integrated functioning of ecosystems remains unclear because most evidence comes from analyses of biodiversity’s effect on individual functions” and call for broader research approaches as “the effects of biodiversity on ecosystem function become more important as more functions are considered”.
Closing knowledge gaps
As a consequence, the relation between biodiversity and ESS remains rather underexplored: apart from studies demonstrating the biodiversity—ESS/ESB correlation for a few services, a theoretical construct, a more general explanation of the cause for the correlation is missing: the empirical observations lack proper theoretical foundations. The biological evidence is becoming more solid, although most studies to date analyse the relation of certain elements of ecosystems (and not of their diversity) to ESS/ESB generation, while rarely relating them to sociocultural and social–economic aspects (which makes the definition of services problematic); finally, there are few works empirically demonstrating correlations between biodiversity and ESS at the landscape scale. Some attempts to test whether there is a positive link between diversity and ESS by selectively choosing regions with high biodiversity and comparing them to regions chosen at random did not provide evidence of a significant effect (Naidoo et al. 2008). However, large-scale observational and experimental studies have confirmed consistent links between functional group diversity, ecosystem functions and ecosystem services (see, for example, de Vries et al. 2013; Tsiafouli et al. 2015), and recently advanced modelling helped to unravel mechanisms linking productivity and plant species richness (Grace et al. 2016). Moreover, the importance of biodiversity for the stability of ecosystems and ESS above and below ground is increasingly recognised (Ives and Carpenter 2007; Wall and Nielsen 2012). Single ESF or ESS are sometimes found not to be dependent on biodiversity, for example the specialisation in agriculture with genetically homogenous seed and high pesticide demand which decreases all levels of biodiversity is a result of management for maximising just one service, yield, at the expense of others. Lefcheck et al. (2015) therefore emphasise that more attention should be paid to the provision of ecosystem multifunctionality which strongly depends on the biological richness of a system. Soliveres et al. (2016) recently reported that high levels of diversity across nine different trophic groups, including 4600 taxa, jointly affected 14 ecosystem functions and services in grasslands and that multitrophic richness was most beneficial for regulating and cultural services and for multifunctionality of the ecosystems.
In arable ecosystems, overall biodiversity depends mostly on soil organism and plant (incl. weed) diversity. High weed diversity is generally acknowledged as fundamental for, and indicative of, high overall diversity, although correlations of diversity patterns across taxa have been found to be weak in some studies (Billeter et al. 2008). In many European countries, agri-environment schemes (the pro-environment measures in agricultural management eligible for EU funding) have been suggested and implemented attempting to conserve the diversity of arable fields and of the cultural landscapes as a whole.
Rice ecosystems and their biodiversity vary in climate, geomorphology and farming practice. In Southeast Asian rice ecosystems, as studied by LEGATO, weeds may provide various services, including ruminant food and feed resources (Kumalasari et al. 2014), but the spatial and temporal differentiation of weed vegetation is as yet little known.
Differences in plant species numbers and composition have been found particularly between lowland and upland areas (Fried et al. 2017), and there is evidence that traditional multiple and intercropping systems should be promoted to support high plant diversity levels in smallholder landscapes (Kumalasari and Bergmeier 2014). LEGATO contributes to a better understanding of the variation in plant composition through a series of study sites in Vietnam and the Philippines, at different altitudes, and with different human impact on fields and surrounding structures. The focus of the research is at field and landscape scale, and the land use intensity has been found to be much reflected by the weed diversity (Fried et al. 2017).
While it has been shown that landscape complexity can enhance the populations of natural enemies and thus benefit crop production by reducing pests (Rusch et al. 2013), the effects of landscape structure in rice agro-ecosystems have been largely unknown. LEGATO combines extensive field sampling of arthropod communities with the analysis of GIS and remote sensing data to examine the relationship between the metrics of landscape composition and configuration and the structure of arthropod community at 300 m buffers around each study site (Dominik et al. 2017). Landscape complexity, in particular the proportion of rice and non-rice habitat, affects guild composition and species richness of the arthropod community but the responses vary between taxa, especially for the two main pest species the brown planthopper and the white-backed planthopper (Heong and Hardy 2009). A better understanding of the role of landscape complexity in biological control could not only support crop production and efforts to minimise pesticide use (Bengtsson 2015), but can ultimately result in increased economic, social and environmental sustainability of the farming system. In addition, a better protection of non-crop habitats can also enhance a range of cultural services such as the aesthetic value of the landscape, cultural heritage and the opportunities for eco-tourism (Tekken and Settele 2014).
Decomposition and nutrient cycling
The decomposition of organic material is one of the most important functional processes regulating energy flows and nutrient cycles (Lekha et al. 1989; Dungait et al. 2012; García-Palacios et al. 2013). However, the effects of agricultural intensification on decomposers are still poorly investigated, even though a functional decomposer community is an essential part for the development of sustainable agricultural management practices (Beare et al. 1997; Creamer et al. 2016). The decomposer subsystem is therefore an ideal system demonstrating a strong pathway from anthropogenic management via biodiversity, the functioning of ecosystems to an ESS (soil fertility) and an associated benefit (yield). Moreover, given the strong link between decomposers and biocontrol of pests by predatory invertebrates (Settle et al. 1996a, b; Barrios 2007; Birkhofer et al. 2008; Wurst 2010), considering the effects of management practices on soil biota may help to support a diverse and functioning soil microbial and faunal community (Bengtsson 2015), ensuring soil nutrient cycling (van der Heijden et al. 2008), soil stability (in wet rice agriculture not the most important factor) and providing protection of plants against pathogens (Bardgett 2005; Bardgett and van der Putten 2014).
The link between anthropogenic influences on this relationship is complex and may be affected by processes on different scales. For instance, the regional pool of species contributing to a given ESS might be affected by landscape management and the corresponding quantity and quality of habitat structures (Flohre et al. 2011). This is especially relevant for organisms which switch between an aquatic and a terrestrial phase during their life cycle (e.g. chironomids). Further, and on a more local scale, different management practices (e.g. crop residue management, application of agrochemicals) affect the diversity and abundance of the aquatic as well as the soil fauna, including their effects on decomposition dynamics (Paoletti and Bressan 1996; Peters et al. 2013; Schmidt et al. 2015b). In LEGATO, we analysed such practices and their impacts on decomposition and invertebrate diversity on this scale with experimental designs allowing us to integrate specific questions into the large framework of the LEGATO studies.
We could show that decomposer invertebrates can completely compensate for the reduced microbial decay rates under the anaerobic soil conditions prevalent in flooded rice fields (Schmidt et al. 2016). Therefore, invertebrates are of particular importance for the effective decomposition of rice straw litter in this environment (Kögel-Knabner et al. 2010; Schmidt et al. 2015a, b). We could also show that landscape structures next to rice fields accelerate the rice straw decomposition by the invertebrate fauna (Schmidt et al. 2015a). Further, using rice straw as organic fertiliser significantly increased invertebrate abundances, especially in the aquatic phase of the fields (Schmidt et al. 2015b). With our experiments on a local scale, we gained important insights in decomposition dynamics as well as abundances and the diversity of a wide variety of invertebrates inhabiting paddy fields with their different functional roles in regulating energy flows and nutrient cycles and therefore soil fertility. These findings may be transferable to different regions of rice cultivation contributing to an improvement of sustainable agricultural practices to stabilise or even increase yields, reduce water consumption and trace gas emissions while preserving biodiversity and natural landscape structures (Václavík et al. 2016).
Sociocultural processes and ecosystem service potentials (ESP)
ESP are established in a co-production process by human societies defining potential uses of ecosystem structures and functions (Fig. 1); this cultural appropriation of a natural space as a basis for livelihood intersects with the sociocultural evolution of a society. It is this socio-ecological system which has to be analysed to gain understanding of the processes the generation of ESS depends on.
Some of these ESP may be independent of each other, while others are mutually dependent, co-produced or building upon each other. According to our definition elaborated earlier, out of many and partly mutually exclusive service potentials, a part is selected by society to be mobilised, and the ESS to be realised. Others are not mobilised due to economic (e.g. because they are unprofitable), social (e.g. uneven distribution of impacts between social groups), cultural (e.g. taboos), legal (e.g. regulations or laws) or power reasons (e.g. competing interests) (see Fig. 3). In order to mobilise the service supply potential attributed to an ESF, and to mitigate potential disservices (Förster et al. 2015), at least for provisioning and cultural ESS, the (conscious) investment of time, labour, physical resources and often money as a means to mobilise them is required to produce ecosystem services in order to gain a benefit, as depicted in Fig. 10.
Recognising a space or a landscape and its use potentials requires an act of abstraction from and an interpretation of the mere biophysical entities, based on a long-term sociocultural evolution, related socialisation-dependent codes and milieus (Kühne 2013; Hokema 2012). This societal construction of a space (or “geographical imagination”) (Werlen 2000) implies the central role of individuals who create the linkages between the social and material dimensions of a landscape (Kühne 2013). In the context of the ESS framework as shown in Fig. 1, by the recognition of ESF, value attribution to constitute ESP and the mobilisation of ESS, ESB are generated and allocated (see Fig. 3). The process is complex with an inherent dynamic and influenced by sociocultural development and natural processes.
Ecosystems services (ESS)
Following the flow of events down the ecosystem service cascade after a societal decision which ESP is attributed to an ecosystem and its functions, the chosen bundle of ESPs has to be mobilised (Fig. 1). Providing the energy, material and human resources (skills, time, labour) to be invested to achieve this is another socio-economic contribution to ESS provision. Money is often, but no way exclusively, a means to mobilise these inputs. Benefits (ESB) gained from nature but not recognised as such are not considered to be the result of ESS; they have no economic value as economic valuation is based on subjective preferences and requires recognition of benefits and their origins (Spangenberg et al. 2014b).
While for provisioning services the recognition of benefits is usually no problem (grain is sown, trees are cut, etc.), and cultural services often require mobilisation by societal/community processes (e.g. travels, rituals), regulating services are not easily recognised as such. Only few of them, such as pollination, are well known to the beneficiaries and the public at large, as our interviews in LEGATO have shown; for others like biocontrol the knowledge is vague or—for instance regarding climate regulation—almost completely absent amongst the local stakeholders, although the vast majority of them was ranking climate change as one of the two most important threats of the coming decade. However, when in a screening study of ESS in all LEGATO study regions (Burkhard et al. 2015) local stakeholders were asked to identify land cover types’ capacities to supply ESS within “their” region (after Burkhard et al. 2012), the results revealed, among others, a high relevance of provisioning and regulating ESS for rice agriculture.
Many regulating services are public goods, i.e. nobody can be excluded for enjoying them and the gains of one beneficiary do not diminish those of another (think of flood protection which serves all people in a region protecting their lives, and—to a varying degree—their assets). For LEGATO this implies that the three kinds of ESS analysed require different communication strategies, adapted to the respective cultural context.
Provisioning services provide individuals or groups with goods which can be consumed, sold or used for further production. Within LEGATO nutrient cycling was analysed as an ESF generating nutrient provision as a provisioning ESS in its own right, which at the same time is an important component of the food production system and thus closely linked to other provisioning ESS. Water and crops are consumer goods investigated in LEGATO, while nutrients are “invested” in future agricultural production.
Nutrient and water provision
Some soil properties such as soil organic matter and the content of plant-available nutrients are much more “manageable” than other inherent properties such as temperature, texture and clay mineral composition. Understanding their interactions and the impacts on fertility supporting processes like nutrient provision, water cycling and biological activity and the influence of external drivers, natural (climate, natural hazards) as much as anthropogenic (land use, farming practices), is important for deriving sustainable agriculture concepts (Brady et al. 2015). Such concepts are needed to prevent soil degradation processes like erosion, sealing, compaction, pollution, loss of organic matter and declining biodiversity (Dominati et al. 2014).
In irrigated rice ecosystems, two otherwise unusual soil properties play a key role. Firstly, the practice of “puddling” (tillage of flooded soil) usually leads to the formation of a dense soil layer (“plough pan”) which reduces leaching of the flood water to deeper layers of soil. The high water demand is an important characteristic of irrigated rice production systems, and unless water is abundant, any water-saving factors are of great economic and ecological importance. The soil assessments within LEGATO showed that at some sites in the mountains, plough pans are hardly developed, which makes a permanent water supply throughout the growth season indispensable. Secondly, rice—like other grasses—contains an unusually high concentration of silicon (Si), indeed more than most other plants. Recent research suggests that a sufficient Si availability is beneficial for rice growth (Guntzer et al. 2009). The factors controlling Si cycling and availability in rice soils are, still, understudied. Within the LEGATO project, it was shown that plant-available Si is low in Vietnamese, and high in Philippine paddy soils. This finding can be explained by differences in geologic and pedogenic conditions between the countries (Klotzbücher et al. 2015a, 2016). In Vietnam, the low Si availability might limit rice production. However, farmers might be able to increase Si supply to rice by fertilising Si and recycling Si-rich rice straw (Marxen et al. 2016). Also changes in water management may affect Si availability (Klotzbücher et al. 2015b).
Soil and plant analyses together with the experiments analysing the role of microbes and invertebrates in rice straw decomposition (described in the “Ecosystem properties and ecosystem functions (ESF), and the role of biodiversity” section) contribute to clarifying the functioning of this compartment. Understanding this module of the overall system is indispensable for getting to grasp with the rice production system as a whole, as it is with any other agricultural system.
For this purpose, not only natural science analyses of biomass growth on individual fields provide important information, but also interviews with farmers, a contribution from social science. The farmers provide information regarding the inputs they use (seed, fertiliser, pesticides, machinery, work, water) and the outputs they appropriate (mainly rice, some intermediate or by-products from the fields, plus fruit and vegetables mainly from the gardens, and cultural ecosystem services). Combining the analysis of cultural conditions, contributions and constraints with an economic analysis helps to understand the prevailing land management system and to assess the opportunities for improving livelihoods. Natural science analyses help to understand the effectiveness of the measures reported by the farmers and can serve for their validation.
Regarding the ecosystem service benefits (ESBs), their definition and realisation (appropriation and commercialisation) always depend on the local situation including tradition, culture and habits. This is also obvious within LEGATO, where the situation differs substantially between research regions. In the mountain regions in both Vietnam and the Philippines, subsistence economy structures dominate, while in South Vietnam and parts of the Philippines the production is fully commercial, market integrated (Pingali et al. 1997; David and Ostuka 1994). Other regions (the lowlands of Northern Vietnam with an average farm size < 1 ha) show a mixture—farmers plant an “aromatic” but lower yielding variety for personal and family consumption (use value generation), while growing high yielding varieties for the market on the rest of his/her land (exchange value generation: monetary income). Market production in Southern Vietnam and much of the Philippines draws on larger fields and knows no such set-aside land used to produce for family consumption.
Good examples for these interactions are dragonflies: their aquatic larvae predate on mosquitoes and invasive snails in the water bodies of the paddies and the adults on pests, like leaf- and planthoppers (Ott 2015). Their general diversity in the paddies and their surroundings is influenced by the habitat heterogeneity of this area. As a consequence, their diversity could be used as an easy and quick indicator of the landscape quality.
As agricultural systems are early succession stages permanently set back to the same dynamic and productive starting phase by human steering and intervention; they are not stable states but can be in a state close to system discontinuities. Far from equilibrium (left alone they would disappear through succession) they can be described as dissipative structures in need of a continuously high throughput of resources (energy and materials) to maintain their structure (Prigogine and Stengers 1984). The limited resilience resulting from suppressing natural regulation processes renders further intensification (i.e. increasing input levels) risky; it may push many systems over the threshold of system stability, not least by negatively influencing biodiversity (Hautier et al. 2015). In those cases not only the provisioning services like harvest and soil fertility would be at risk, but also essential regulating services which are the base of drinking water quality, food security and human health, in particular in Vietnam (Hoai et al. 2011). Instead management strategies should move the system further away from potential tipping points and enhance resilience, in particular by strengthening natural regulation processes such as the biocontrol of herbivores (pests).
Herbivore populations are naturally regulated by a range of interacting natural enemies that respond to herbivore population changes, brought about for instance by climatic and other environmental conditions (Schmidt et al. 2003). In rice ecosystems (like in most other agro-ecosystems), two main functional groups or guilds stand out, predators and parasitoids (Heong et al. 1991). The effectiveness of such natural enemies is influenced not only by natural (if anthropogenically modified) pressure factors, but also by management decisions including the choice of the rice varieties used and farming practices like the kinds and amounts of fertiliser and pesticides applied (Bengtsson 2015). Landscape management decisions like the choice of surrounding crops or the floristic composition of set-aside habitat, including the management of plants on rice bunds influence the functionality of the cropping system in general, and the effectiveness of the natural pest control in particular (Dominik et al. 2017; Tylianakis et al. 2007). As biodiversity is a decisive factor in this respect (Way and Heong 1994), LEGATO has monitored and inventoried the invertebrate fauna of rice fields and the responses of some of these, particularly egg parasitoids, to variations of herbivore populations. Thus, LEGATO has analysed the predator and parasitoid components as the first step, but also compiled the names of rice varieties used in the fields, documented management practices (Sattler et al., this issue) and defined surrounding habitats as factors influencing biocontrol effectiveness (Rusch et al. 2013; Tscharntke et al. 2007). One recommendation derived from these analyses is, for instance, the proposal to maintain throughout the year small natural water bodies in the vicinity of the fields for a faster recolonisation of the paddies by dragonflies as beneficial insects.
Beyond insects, other pesticides such as molluscicides can also have severe impacts on non-target organism, as many insecticides or molluscicides are not specific to certain pests. For instance, golden apple snail (Pomacea spp.), a widespread invasive pest in rice, is mainly controlled by synthetic molluscicides by farmers, due to their effectivity and despite of the awareness of farmers for the impairment of the environment and their own health by these chemicals. This kind of pest snail management and presumably to some extent the snails themselves have led to a strong decline in native molluscs in rice fields (Horgan et al. 2014). Native molluscs, however, serve as food for predacious species and humans and might contribute to the ESS of nutrient cycling by their activity as decomposers.
Socio-economic synergies emerge not only through the reduction of costly inputs, but also through the additional production opportunities emerging from ecological engineering (Westphal et al. 2015), in particular from planting vegetables in addition to rice, increases in honey production, and from having more time for raising livestock (e.g. ducks or chicken). Obviously, for biocontrol analysis as for all agricultural management activities, ecogenic and anthropogenic factors, both potentially positive and negative, have to be taken into account.
Despite the fact that rice is actually wind-pollinated (but see Pu et al. 2014), organism-based pollination is crucial for insect pollinated crops and wild and ornamental plant species, which are often grown close to the fields in adjacent villages (Kremen et al. 2002; Garibaldi et al. 2014). For a balanced and sufficient nutrition in areas specialised on rice production, such additional plants are an indispensable part of the menu. Also honey and other products (including wax, propolis and larvae) from mainly native wild bee colonies are welcome, and a bee hive in the backyard of a farm, although not frequent, is not unusual. Limiting insecticide spraying in rice fields supports pollination in neighbouring non-rice areas (gardens, fruit tree plantations) and thus the nutritional situation of smallholder farmers (Brittain and Potts 2012).
In LEGATO, a diversity of experiments has been conducted to analyse the frequency of wild bees, bumble bees, honey bees and other pollinators, and their dependence on landscape management. Particular emphasis has been given to the question how the known positive effect of ecological engineering on pollination (and biocontrol) can be maximised. To assess the current health status of bee communities, the interactions (in particular competition and pathogens transmission) between non-native and native bee species have been evaluated.
Broad-scale effects of climate and land use change
Investigation of the interactions between broad-scale climate and land use change and their combined effects on current and future ESS provision in the region was undertaken in LEGATO in order to complement the picture of factors influencing the kind and volume of ESS and ESB generated, by accounting for drivers that operate at larger spatial scales. This required scenarios of potential future climate and land use conditions in all seven study areas. The climate scenarios, provided by five general circulation models (GCMs) applying three SRES emission scenarios (A1B, A2, B1; climate scenarios developed for the IPCC, see Nakićenović et al. 2000), have been downscaled to match the 30-m resolution of the analysis. The land use scenarios, covering the years until 2030, were built upon experts’ knowledge (including questionnaires and interviews with both scientists and local stakeholders) and the DART model of the world economy (Calzadilla et al. 2014; Delzeit et al. 2017). The land use scenarios focused on changes in the area covered by settlements, rice fields, gardens, pasture/grassland and natural vegetation, based on observations by the SPOT satellite.
In order to simulate potential changes in the provisioning ESS of crop production, and in regulating ESS such as water balance and carbon sequestration of natural vegetation, the vegetation and hydrology model LPJmL (Sitch et al. 2003; Gerten et al. 2004; Bondeau et al. 2007; Rost et al. 2008) was applied to quantify the bundles of and trade-offs between competing ESS under these different scenarios until the end of the twenty-first century (Langerwisch et al. 2017). Our projections indicate that under the current land use pattern climate change will lead to a decrease in rice yields as well as fruit and vegetable production towards the end of the century. However, changes in land management strategies have the potential to offset the negative effects of climate change on rice production in the LEGATO landscapes (not necessarily on the national scale) either by increasing the extent of crop area (although mostly at the expense of forest habitats, with corresponding environmental downsides) or by applying optimal amounts of fertiliser, preferably organic fertiliser such as rice straw and manure, to allow for sustainable rice production. Water provisioning for irrigated rice fields is likely to be increased, additionally climate change might shift the months of high water availability. In the natural vegetation, climate change induces a decrease in net primary production and an increase in heterotrophic respiration for most of the study areas, leading to lower carbon sequestration in the region. Under severe climate change conditions (SRES-A2), forest composition in mountainous areas will shift from the dominance of temperate trees to a more heterogenic structure including tropical trees. Under moderate climate change (SRES-A1B), forest composition is likely to maintain the structure required for pest control in rice fields and for preserving the quality of freshwater habitats for fish, an additional food source for local communities (Langerwisch et al. 2017).
Attributed immaterial values of rice landscapes: cultural services and their role for sustainable land management
The landscapes assessed are more than functional production sites, they are parts of livelihoods and in this respect social constructs. Community plays a major role. In many interviews farmers emphasised sociocultural aspects as main motivation to accept difficult living conditions, e.g. social structures, cultural traditions, social norms and values and a “feeling of home” (sense of place), or institutionalised mutual help systems during the rice cultivation stages. Confidence in sufficient production capacity based on local expert knowledge, prospective thinking and the wish for social stability and security for the next generation, and as well the interest in the production of “clean food” support openness for the safer production techniques associated with ecological engineering. In areas where the use of pesticides and mineral fertilisers has been replacing traditional pest control and organic fertilisers, important knowledge inventories are being lost to present and succeeding generations. This applies in particular the cultivation of traditional crops, leading to a substantial change of traditional agro-biodiversity. However, the use of high yielding varieties (HYVs) has substantially contributed to food security and the reduction of hunger in all regions. The question rises, if the replacement of traditional varieties is necessary to ensure food security, at the expense of reduced agro-biodiversity and disturbances in the rice field food web, or if a management system is biologically, technically and culturally possible, preserving a fully functional, adapted agro-biodiversity.
The strong link between nature and man in rice cultivation, inter alia the handling of risks, the development of adaptation strategies, the division of labour and tasks in field work, food processing and trade, has emerged in the evolution of sociocultural milieus, cultural traditions, social norms and values with many common elements, but also with regional differences (Tekken et al. 2017). Identity includes social interaction and the physical material environment. Thus, human activities are an essential part of the processes and structures that produce those cultural services and benefits farmers associate with their rice landscape: identity values (e.g. language, apparel, farmers milieu), heritage values (history and tradition, e.g. folk songs and ancient customs), and educational values (e.g. cultural roles and attitudes). As farm workers and managers cultivating other people’s land often feel less bound to that heritage, a history of working on one’s own land seems to strengthen the link to local or regional culture and identity (Tekken et al. 2017) as does the increasing relevance of ethno- and eco-tourism, enhancing farmers’ awareness of the value of their heritage as a source of income, in particular in the financially poor but culturally rich mountain areas.
Landscapes connect nature and culture. However, the respective sociocultural context determines what is selected or perceived as aesthetic landscape elements, not individual processes (Backhaus 2011; Coeterier 1996). For example, in central Europe, the productive use of agricultural landscapes has been perceived as aesthetically appealing, up to a certain point when the changes brought about by intensive production systems began to undermine landscape aesthetics (Wöbse 2002). In the LEGATO sites, the way rice farmers describe their landscapes often equates production values and other forms of usefulness with landscape elements (e.g. rice field or terrace, street) having aesthetic value. Despite an often difficult living situation in most cases a strong and positive emotional attachment to the rural landscape and its familiar structures could be found, even for a better income they would not give up farming (although they often recommend their children to do so). Landscape aesthetics as service category includes characteristic functional landscape elements associated with cultivation (e.g. farmhouses and gardens, stonewalls or rice terraces), characteristic sociocultural landscape elements (e.g. spiritual areas such as cemeteries or shrines close to or in the fields, traditional village structures) and intangible landscape values (e.g. aesthetic emotional contemplation of rice field; bequest and spiritual values, like mountain and bamboo forests, endemic flora and fauna, migratory birds as symbols of “good luck” (Tekken et al. 2017).
Related to the agricultural specification, production patterns, farming methods, and along with socio-economic and sociocultural developments, different forms of knowledge have evolved and are associated with rice production and sociocultural characteristics: scientific knowledge, intellectual and artistic inspiration, collective expert knowledge and implicit or tacit knowledge (Tekken et al. 2017).
The forming of nature into a human living space is a complex and dynamic interplay comprising a multitude of ESP identification and ESS mobilisation processes. Learning processes in connection with food production are reflected in practical and specialist knowledge (expert knowledge) in the field of agriculture. In the case of the LEGATO landscapes this agricultural expertise, as a cultural service, includes food production on marginal soils, knowledge on climatic conditions, local flora and fauna (beneficial and pest species; rice fish system), handling of risks, problem solving, knowledge and use of local food diversity, adequacy of crops for local soil and climate, production steps (rice cycle), natural medicine and much more. However, this knowledge is not evenly distributed but differentiated by region and social group—traditional priests (mumbaki) in the Philippine mountains pass their knowledge on to their sons, not to the public, and farm workers are often less informed than farm managers.
Indirect effects of agricultural and sociocultural habits on the functionality of ESS in rice cultivation
The indirect effects comprise the linkages between landscape, settlements, traditional architecture, cultural practices and traditional land use practices on the one hand, and agro-biodiversity on the other. Besides aesthetics, they include knowledge systems and cultural identity.
Linkages between landscape, settlements, traditional architecture and agro-biodiversity (Landscape Aesthetics)
The structural diversity of landscape patterns is connected with habitat diversity and the occurrence of species (Syrbe and Michel 2013). A richly structured landscape matrix meets the habitat requirements of a wider range of species and provides more ecological resources (Walz and Syrbe 2013; Syrbe and Michel 2013). Also settlement structures can affect agro-biodiversity: traditional villages surrounded by rice paddy fields, private gardens, fish ponds, livestock keeping, irrigation systems, agroforestry, etc., create a specialised biodiversity. Part of this can also be the traditional architecture (e.g. houses and hedges); if, for example, a house is constructed with natural materials (straw, grass, wood, and bamboo), it has the potential to provide man-made habitats for wildlife (e.g. bee hives). The replacement of natural with more comfortable, durable construction material (cement, concrete, or iron/tin roofs) can reduce habitat opportunities. The increasing amount of land used for settlements, transport or other infrastructures affects landscape functions, e.g. it can lead to habitat fragmentation or interrupt wildlife corridors. However, the hypothesis that in those LEGATO landscapes with still high structural diversity of landscapes (mostly mountainous subsistence farming in Ifugao/Philippines and Sapa/Vietnam) farmers are less often affected by the impacts of rice pests could not be empirically confirmed, at least not based on the qualitative interviews. The expected higher species abundance in regions with slow agricultural modernisation processes and often traditional settlement patterns did not lead to unambiguously less perceived risk than what farmers in regions with low structural landscape diversity and intensive rice production described. In the latter, insect pests are perceived as a constant threat (e.g. Nueva Ecija/Philippines, Tien Giang/Vietnam).
Linkages between traditional land use practices and agro-biodiversity (Knowledge Systems)
Due to the very limited external inputs available, traditional subsistence farming has to take advantage of all available natural nutrient cycling mechanisms, in particular at marginal locations. Rice production traditionally was an integrated system, with other species or crops grown concurrently or with intermediate cropping, e.g. rice fish farming. To achieve optimal results, resources were used as efficiently as possible and created specialist knowledge, e.g. efficient livestock management, water management of paddies, production of organic fertiliser and nutrient management, erosion control, or synchronisation of farming activities for risk distribution. This has produced sensible interrelations between nature and human activities, particularly in areas with poor soils. Meanwhile, in all LEGATO landscapes except the in the Philippine mountains, farmers have exchanged traditional crops with HYVs, apply pesticides, and use mineral fertilisers, at least as an addition to manufactured organic fertiliser. Many (older) farmers stated that with the loss of traditional farming systems—due to several reasons—also species diversity has changed, in and around the fields. However, many interviewed farmers did not actually have deeper agro-ecological knowledge on rice field food webs and the functional relationships of pest and beneficial species. Even if at least fragments of such specialist knowledge were preserved by older generations, it has been fallen into oblivion under the influence of modern production practices.
Traditional cultural practices linked to agro-biodiversity (Cultural Identity)
In all LEGATO landscapes, festivals and to some degree rituals are traditional components of the rice cultivation cycle. Until today, they have a social bonding force and are important social events. Parts of these festivals are also regional culinary specialties, in particular sticky rice made from traditional rice varieties (e.g. heirloom varieties in the Philippines). Some of the interviewed farmers in Vietnam provide areas for the cultivation of old varieties, either for the purpose of celebrations or worshipping events, or as monetary reserve for times of short budgets, as the market price is higher than that of HYVs. Farmers who stated that they reserve areas for the cultivation of these traditional varieties also mentioned the excellent adaptation ability of these crops to the marginal conditions. However, the production volumes are low compared to the harvest results of new varieties. The increasing awareness of these cultivars as cultural heritage (e.g. in the Philippines: Manila Bulletin, May 14, 2015, see http://www.mb.com.ph/rare-rice-art-honored-as-national-treasures/) increases the opportunity to save old and regional varieties from extinction, and with this to preserve centuries-old expertise. A further aspect is the conservation of specific agro-biodiversity in areas where these old crops are still cultivated. Most farmers who grow old varieties stated that compared to their conventional fields they do not apply pesticides, but invest more time for the manual pest control and field maintenance (e.g. hand weeding instead of using herbicides, picking of invasive snails instead of using molluscicides). However, this might as well correlate with the financial situation of farmers, in order to save expenses needed for conventional rice production. Essential parameters for the cultivation of old varieties are the age and income situation of farmers: older farmers are able to refer to inherited knowledge and long-term experiences with requirements of the old crops, younger farmers with families must take advantage of every space available to grow rice to ensure food security. Increasing livelihood pressures and economic constraints thus inevitably lead to the reduction of areas and share of traditional rice varieties, and with this of traditional agro-biodiversity.
From ecosystem services ESS to ecosystem service benefits ESB
Commodification and urbanisation erode indigenous knowledge about sustainable, low input agriculture, which is potentially valuable for sustainable agriculture in both the mountain areas and the lowland (Spangenberg et al. 2014a). The resulting target conflicts of development policy is one of the main reason why unforeseen environment conflicts might arise in Vietnam; recognising increasing ESB from ecological engineering as a valuable contribution to sustainable development is considered to support a shift of the development paradigm towards government support for a policy reducing the negative impacts to environment and ecological systems in rice cultivation areas.
LEGATO analyses the pathways for preserving knowledge and cultures pursued by the Philippine and Vietnamese governments, which are different not least due to the different political systems in both countries. In both Banaue and Sapa stakeholders hope that sustainable agriculture plus eco-tourism branding will offer opportunities to create additional income and sustain living cultures. This is the reason why LEGATO has become engaged in eco-tourism development in both Vietnam and the Philippines.
ESBs in LEGATO
ESS are not yet benefits—in the case of LEGATO, imagine a field full of rice. It represents a provisioning ESS, generated from ecosystem functions (ESF) such as nutrient cycling and water availability. First an ecosystem service potential (ESP) for rice paddy construction and use must be identified, and effort invested in mobilising it (field preparation, sowing and transplanting). To activate the ESS flow and to reap the benefits by appropriating the ESS, the rice must be harvested, dried, threshed, purified, milled, polished and further processed. Then benefits (food or income) accrue—albeit to different degrees—not only to the farmer but to all who are involved in these processes, either commercially or based on mutual support and social obligations.
For research projects this is an important insight as when coming as external agent with a certain reputation and credibility, a project and its staff will immediately become part of existing conflicts, not as a matter of choice but because they and their results are at risk of being instrumentalised by conflicting parties (Falck and Spangenberg 2014; Förster et al. 2015).
The method promoted by LEGATO to generate win–win situations of mobilising ESP with less agricultural inputs while safeguarding or even improving ESB is ecological engineering. It includes measures such as appropriate application of (preferably organic) fertiliser, realising the yield potential of the rice crop but avoiding water pollution and eutrophication by the runoff from the rice fields. Demand for fertiliser can be reduced by avoiding over-fertilisation, by transplanting seedlings early (within 2 weeks) and carefully (single seedlings rather than clumps), with increased distance between seedlings (but also requiring more work). Due to higher tillering rates this does not decrease the harvest but the number of seedlings required, thus saving work and cost (Prasad 2006). Another measure is to refrain from insecticide spraying for at least the first 40 days of the growth cycle (plants recover from damages in this early growth stage). Furthermore, damages can be reduced by the fact that limiting fertiliser application to the physiologically necessary quantum also reduces herbivore population growth rates and can promote effective population regulation or prevent localised herbivore outbreaks through the actions of natural enemies (Huan et al. 2005). Each of these steps saves money for the farmer—significant income improvements are possible at the same selling price for rice. Such measures have been widely promoted among farmers in South Vietnam as the Vietnamese government introduced the “3 reductions, 3 gains” programme as a means to increase the profitability of rice farming, focussing on reducing excessive use of seeds, inorganic fertiliser and insecticides, except for nitrogenous fertiliser use which is to be enhanced (Heong et al. 2010). Through these reductions the programme contributed to improved natural biocontrol of rice pests (Huan et al. 2005; Heong et al. 2010). Some of these steps, plus a changed water management keeping the soil not permanently flooded have been incorporated into what is called the “system of rice intensification” (SRI), developed by farmers and spread by grassroots networks, long ignored by research institutions but currently under scientific analysis (see, for example, Basu and Leeuwis 2012; Noltze et al. 2013; for “ecological intensification”1 more general see Pywell et al. 2015). The case of SRI highlights the importance of farmers’ knowledge and is an additional motivation for the participatory approach to a co-production of knowledge pursued by LEGATO.
Auxiliary management measures can include the synchronising of crop establishment, the provision of resources and refugia for other beneficial species including birds, spiders and predatory wasps, and improved bund management in terms of size and by planting nectar rich plants. Synchronous planting of rice crops has been show to effectively reduce the spread of viruses (such as tungro virus) because the plants and the leafhoppers that transmit the viruses must build up numbers before the rice ages and becomes less suitable as a food source (Norton et al. 2015). Thus, a higher local-scale synchrony of seeding/transplanting reduces the vulnerability, embedded in asynchronous seeding on a higher geographical level, while higher landscape diversity can reduce biocontrol effectiveness (Martin et al. 2013). Planting bunds with plants that benefit natural enemies, particularly during early crop stages, can theoretically improve regulation by providing alternative food sources when prey densities are low, or by providing food and refuges for specific life stages of important natural enemies such as parasitic wasps (Lu et al. 2014). An additional measure might be the provision of good living conditions to generalist predators like dragon flies in neighbouring waters. Ratoons (interim rice growth between the main harvests) remain reservoirs of some plant diseases, particularly insect borne virus diseases, like tungro, grassy stunt and ragged stunt (Holt et al. 1996), and also often sustain a small population of hoppers (Chakravarthy 1987) among other insects. This makes the ratoon rice fields a very attractive habitat for predatory arthropods, like spiders and more specialised natural enemies like parasitoids and predatory bugs while it does not promote high hopper populations in the post fallow crop (Schoenly et al. 2010) but might help reducing pest infestation by sustaining natural enemy populations between rice crops. This and the influence of synchrony or asynchrony are analysed in the Philippines by LEGATO research teams.
In a nutshell, ecological engineering offers a way to sustain (non-excessive) agricultural surplus while avoiding contamination and sustaining or restoring natural productivity, not least by enhancing biocontrol. A diversity of natural enemy species will be required for biocontrol to be successful, given the high diversity of potential pest species and need for resilience in the face of changing climate and management practices (Islam et al. 2012; Heong et al. 2013). The most serious obstacle to such behavioural adaptations, despite the economic gains associated with them, are established habits and routines, a mental lock-in with partly devastating results (Heong 2009; Heong et al. 2015; Spangenberg et al. 2015a). Scientists from China, Vietnam, Thailand and the International Rice Research Institute IRRI have begun evaluating the use of ecological engineering as a concept to restore biodiversity and biological control services to sustain pest management (Gurr et al. 2016), including the use of repellent plants to reduce damage by rats, and substitute for the use of rodenticides.
Ecosystem services’ monetary valuation, and subsequently their optimisation/preservation by being traded on markets, have been promoted for more than 20 years as core means for protecting biodiversity (see, for example, Costanza and Farber 2002; Barkman et al. 2008; Fisher et al. 2009); the approach has found supporters (as well as critics) among economists and natural scientists alike (e.g. Daily 1997; Adams 2014; Tallis et al. 2014). It is argued that monetary values allow going beyond the established perception of biodiversity conservation as nature protection for ethical reasons, which has largely been the justification for conservation efforts, be it in the form of wilderness areas disconnected from the everyday environment (e.g. in the USA) or as extensified areas with use restrictions like the Natura 2000 network in Europe; Asia, while trailing that development, is rapidly catching up, supported, e.g. by the World Bank and its WAVES programme. Furthermore, it is hoped that monetisation can generate new funding for nature conservation, for instance by defining a business case for conservation (Bayon and Jenkins 2010; Daily and Matson 2008; Sukhdev 2009).
However, valuing ecosystem services in monetary terms and trading them on markets has become contested over the last half decade for several reasons: it is argued that monetary valuation cannot measure all kind of services due to methodological limits (Gómez-Baggethun et al. 2010; Norgaard 2010; Spangenberg and Settele 2010; Gómez-Baggethun and Ruiz-Pérez 2011) and has to dissemble individual services from the complex ecological networks sustaining them and of which they are constituted (Rees 1998). Furthermore, doubts have been raised about the approach for ethical and value theory reasons (Spash 2008; Muraca 2011; Potschin and Haines-Young 2011; Haines-Young et al. 2012; Rozzi et al. 2012; Spangenberg and Settele 2016). As far as economic valuation is to provide information about “the difference something makes”, e.g. in ex ante impact assessments, marginal value analysis is only possible far from a discontinuity. Close to thresholds or tipping points, the justification of interventions must be political or ethical rather than economic (von Haaren and Albert 2011).
LEGATO partners, working in a transdisciplinary project, are well aware that preserving ecosystem services does not necessarily safeguard biodiversity (Mumby et al. 2008) while vice versa biodiversity loss impinges on productivity and ecosystem service provision as much as major environmental changes like climate change (Hooper et al. 2012). Thus, the economic assessments undertaken do not aim at valuing ecosystems or their functions as such, but are limited to first exploring the values held by stakeholders, and secondly to assess the economic value of the ESB gains and potential losses as manifested in markets. With this limitation we try to avoid the main category errors which have been widely discussed in the ecological economics literature (Spangenberg and Settele 2010), such as confusing the non-existence of a market price for traditional varies which are not offered on markets with an existing market price of zero, or neglecting the divergence of results if the same object is valued using different methods. In LEGATO we understand ecosystem management as including the improvement of human livelihoods as promoted by the IUCN Commission on Ecosystem Management (IUCN CEM 2006) and the Millennium Ecosystem Assessment (MA 2003). In these concepts the value of nature and biodiversity is a metaphor, not a price.
Discussion and conclusions
The ESS concept has been praised as causing a “renaissance in the conservation community” (Daily and Matson 2008: 9455). The claim that ecosystem services preservation is necessarily supportive to biodiversity conservation (Daily 1997; Costanza and Farber 2002; Barkman et al. 2008; Tallis et al. 2014; Deliège and Neuteleers 2015) turns the biologically founded assumption “biodiversity supports ecosystem service provision” on its head (prominently for instance Daily et al. 2009). Although reading a supposed causality in the opposite direction is of questionable logic, a positive correlation could be shown to exist in a number of cases for the specific situation of restoring degraded ecosystems (Polasky et al. 2012; Rey Benayas et al. 2009).
In other cases, however, while biodiversity conservation safeguarding ESS provision could be shown, preserving ecosystem services was found not to safeguard biodiversity (Mumby et al. 2008). This resembles the situation we found in the LEGATO agricultural landscapes, and in rice monocultures in particular, where high biodiversity in the immediate vicinity of the fields has an important regulatory function in relation to pest outbreaks (Heong et al. 2015; Gurr et al. 2011; Heong 2009), while human interventions (especially insecticides) replace or at least suppress natural regulation mechanisms and in the course tend to reduce biodiversity. While maximising one ecosystem service (harvest), this strategy impinges on other service potentials and undermines the resilience of the system, paving the way for later infestations coming at significant monetary and social cost. Reliance on pesticides then often turns into a reality blinder; consequently, not less but more insecticides are used aggravating the problem (Spangenberg et al. 2015a).
Although ESS and biodiversity conservation are not identical, the ESS concept, in particular the ESS cascade including human agency, turned out to be a bridge concept providing a heuristics helpful in integrating the results from a wide range of disciplines in natural, social and cultural sciences. However, it took an extended discourse steered by the project coordination to arrive at a joint understanding of terms and concepts—for economists it is no way self-explaining that ESF are not defined as the biophysical base of ESS but as entities analysed by natural sciences for their functions irrespective of any utility criterion. For natural scientists it was not obvious that ESP are not natural phenomena but defined by human intervention, reflecting societal power structures. However, the social and political conflicts over their definition illustrate that indeed, ESP are culture-dependent anthropogenic constructs. ESS are thus generated in a co-production process of ecosystems and society; they are by no means free gifts of nature. How their value is defined, whether they are individually or collectively enjoyed, or commodified and traded depends on the preferences, habits and routines of the respective society and its economic system.
According to Reed et al. (2014), five steps need to be taken to assure lasting impact of a project. The first three steps (design, representation, engagement) have been part of the LEGATO project design from the outset (Görg et al. 2014). The fourth step “generate impact” has been the identification of land use and landscape features which promote ESF and ESS and the suggestions derived on how management or landscapes could be modified to increase ESF/ESS. Anticipating some of the results, but to a large extent based upon data from previous research, LEGATO initiated a first demonstration activity by establishing field sites under ecological engineering management (which at the first stage is just the planting of flowers near to rice fields, see Normille 2013; Gurr et al. 2016), initiated and accompanied through on-the-ground training. A further impact already generated within LEGATO is the TV series developed in collaboration with the Southern Plant Protection Centre and the Vietnam Long An TV station (Westphal et al. 2015).
It is the fifth step “reflect and sustain” which causes concerns, as it requires long-term relationships and learning processes, monitoring and reflection. This in turn requires sustaining the knowledge exchange even after project funding has ended—a serious challenge, in particular as an increasing share of research is undertaken in the form of fixed term projects which mitigates against such long-term engagement (it would be a misuse of the next project’s funds, unless explicitly included there—which is a generally very rare event). It remains to be seen whether private contacts, meetings at conferences, etc., foreseen as the basis for continued contact can sufficiently substitute for such a permanent exchange and learning process. Ultimately benefits will only be sustained by the ongoing efforts of principle actors incentivised by realised ESB.
Based on the LEGATO experience, but supported by insight from earlier large-scale research projects, a number of conclusions can be drawn. They relate to the way a project is designed and conducted, and in particular to the (often underestimated) role of communication for the success of research projects and their lasting impact.
Science: beyond disciplinary knowledge
The complex nature of the interactions between ecogenic and anthropogenic factors in determining ESS is clearly beyond what any single discipline can apprehend. Thus, multiple disciplines have to collaborate, but in order to do so, they have to find their place in the broader context of the research question. Different disciplinary languages must be recognised as either complementary (shedding light on different aspects of the same issue), redundant (describing the same facts in different terminology) or contradictory (if a disciplinary description includes assumptions in contradiction to the secured body of knowledge of another discipline in charge of the issue). In the latter case, intradisciplinary adjustments are necessary to make disciplinary results “interdisciplinarity-ready” (Spangenberg 2011).
System relationships knowledge is necessary already in the project planning phase, but will be accumulated in the course of a project. It is essential to guide subunits of a larger project towards joint results, but often not adequately published due to the lack of specialised interdisciplinary journals and the trend to ever shorter papers which are hardly suitable to elaborate on complex, multidimensional interactions analysed by a diversity of disciplines. As a result, the integration efforts by interdisciplinary projects and their coordinators go often unrecognised, although they would be essential contributions to the new discipline of sustainability science. Project coordination is no technical task, but a scientific challenge (besides the omnipresent administrative duties).
Stakeholder analysis and the incorporation of stakeholder knowledge are essential for any transdisciplinary project and should best begin in a preproject phase, before the final application for funding is submitted. This can boost the relevance to the research questions for problem solving in the regions of analysis and potentially beyond. However, while stakeholder analysis and discursive knowledge integration may be an important issue in sociological and cultural anthropology journals, they are hard to publish in more natural science- or economics-oriented outlets, and vice versa. This creates a mismatch between the work done and the way the results can be published—which is a problem in particular for young researchers.
Science–policy–society interface: communication and co-operation
Communication is essential from the outset of any major transdisciplinary project: stakeholders have to know in advance what is demanded from them, and what they can expect from a project before they decide to join, or not to. A preproject preparation phase is extremely helpful in familiarising stakeholders with what scientific research can offer, and what are its limits. Already in this phase expectation management has to start: a project and its staff will immediately become part of existing conflicts, not as a matter of choice but because a foreign funded project has a priori a certain reputation and credibility, and conflicting parties will try to benefit from the project in different ways (Falck and Spangenberg 2014; Förster et al. 2015). Understanding such social processes and choosing a position rather than being pushed into a certain corner is important for being able to conduct the work, in particular for the social science parts. In terms of communication it necessitates to first understand the expectations towards the project which the communication about it has been raising, and to sensibly correct them. In LEGATO, potential conflict arenas to be observed include the roles of farmers and farm workers, or the partly complementary, partly competing role of sustained rice agriculture and expanding tourism.
The potentials as well as the limits of what science can contribute should be made clear from the outset. By analysing system dynamics, natural science is able to inform conscious judgements regarding sustainable levels and patterns of ESP use, understood here as modes of use not overburdening the system’s capacity to reliable deliver ESS for an extended period of time, and to point out where the necessity for conscious judgement has been insufficiently realised so far. Then it is up to the society’s institutional systems—not to the scientists—to decide whether the system configuration (and potential changes) is a serious enough concern to justify the efforts necessary to avoid it, for instance due to the loss of ESF and thus the ESS provided by mobilising the ESP based on the ESF. If so, the potential damages are considered societally unacceptable (a consequentialist view), and the institutions are called upon to provide a framework preventing a system flip. The concept of ecological engineering has proven helpful in LEGATO in that is combines a scientific base with normative elements, i.e. the orientation towards sustainable agriculture, which was shared by scientists and stakeholders.
While social and cultural science analyse the interaction of natural and sociocultural, economic and political factors, natural science has to answer “if … then …” questions, trying to assess the future implications of taking certain actions, or not. The permanent underestimation of climate risks by the IPCC (each report referred to previously underestimated or unknown factors) illustrates how difficult this is. Nonetheless it is necessary, but only together the disciplines can provide a realistic conceptual basis for integrating results into an analytical scheme which as far as possible avoids the simplifications dominating the ESS literature so far, providing a basis for land use management decisions as solid as currently possible.
In Vietnam this approach has been complemented by producing a TV series, developed in collaboration with the Southern Plant Protection Centre and the Vietnam Long An TV station, with local actors explaining the benefits of ecological engineering in a sitcom format (Westphal et al. 2015). It was based on the earlier experience that media campaigns can be effective tools to modify farmer behaviour (Escalada et al. 1999).
A specific case is the situation at the end of a research project, not least due to the usually rather limited duration of research projects, while the complexity of the socio-environmental system and its in-built delays suggest that effecting change so as to enhance ESBs and/or their resilience requires sustained engagement with both ecosystems and human society. As research projects last only for a rather short period of time compared for instance with development programmes, national and international alike, preparing for the post-project period is an essential task of projects. Since more often than not it is uncertain if local stakeholders will be able to continue with what has been achieved after a project has ended, communicating clearly and early the future division of responsibility, the stepwise shift towards local stakeholders is a necessary part of the exit strategy each project should develop. The LEGATO exit strategy is based on three key components: (1) the ecological engineering training should enable farmers with the skills to continue the practice after the end of the project (empowerment), in particular given the economic benefits the approach provides them with (2) the support of authorities (in particular in Vietnam) which makes it easier to practice innovative land management methods and (3) the offer of low level, but still continued support from the scientific partners in the host countries, and in cases of emergency from some of the German partners as well (all without being funded for that).
This study was funded by the German Federal Ministry of Education and Research (BMBF) within the BMBF-Funding Measure “Sustainable Land Management” (Grant Number FKZ01LL0917A-01LL0917O, 2010–2016).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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