Provisioning services, such as the production of food, feed, and fiber, have always been the main focus of agriculture. Since the 1950s, intensive cropping systems based on the cultivation of a single crop or a single cultivar, in simplified rotations or monocultures, and relying on extensive use of agrochemical inputs have been preferred to more diverse, self-sustaining cropping systems, regardless of the environmental consequences. However, there is increasing evidence that such intensive agroecosystems have led to a decline in biodiversity as well as threatening the environment and have damaged a number of ecosystem services such as the biogeochemical nutrient cycles and the regulation of climate and water quality. Consequently, the current challenge facing agriculture is to ensure the future of food production while reducing the use of inputs and limiting environmental impacts and the loss of biodiversity. Here, we review examples of multiple cropping systems that aim to use biotic interactions to reduce chemical inputs and provide more ecosystem services than just provisioning. Our main findings are the identification of underlying ecological processes and management strategies related to the provision of pairs of ecosystem services namely food production and a regulation service. We also found gaps between ecological knowledge and the constraints of agricultural practices in taking account of the interactions and possible trade-offs between multiple ecosystem services as well as socioeconomic constraints. We present guidelines for the design of multiple cropping systems combining ecological, agricultural, and genetic concepts and approaches.
2 Plant diversity in multiple cropping systems..........................................................................................................................
3 From biodiversity to ecosystem services.........................................................................................................................
4 Multiple cropping systems and ecosystem services.........................................................................................................................
4.1 Multiple cropping to reduce the consumption of fertilizers and water.........................................................................................................................
4.2 Multiple cropping systems to reduce the use of pesticides.........................................................................................................................
4.3 Multiple cropping systems to reduce environmental impacts.........................................................................................................................
5 Guidelines for designing multiple cropping systems.........................................................................................................................
5.1 Step 1: Identification of a set of services and associated functions.........................................................................................................................
6 Step 2: Selection of species according to the targeted functions .........................................................................................................................
7 Step 3: How can spatiotemporal arrangement and management improve ecosystem functions and the delivery of services?.........................................................................................................................
Over the recent decades, agriculture has focused increasingly on the delivery of provisioning services such as food, fiber, and fuel, paying little attention to other important ecosystem services. This has led to intensive systems relying on the use of massive amounts of agrochemicals with a limited number of genetically improved species and cultivars, thus reducing the cultivated biodiversity. There is increasing evidence worldwide that such intensive agroecosystems have harmful effects, leading to a decline in biodiversity and threatening the environment (Tilman et al. 2001; Cassman et al. 2003). The challenge of agriculture today is to contribute to current and future food security while preserving farmland biodiversity and limiting the adverse effects on the environment or even producing other ecosystem services. Significant changes in practices and policies are needed to support this shift from farming practices aiming to deliver a single provisioning service to practices that deliver a range of services (Robertson and Swinton 2005). One suggestion is to increase the complexity of agroecosystems by increasing cultivated biodiversity (Altieri and Rosset 1995), assuming that biotic interactions could provide the functions required by the systems to enhance soil fertility without external inputs and protect crops against pests and weeds while ensuring adequate crop productivity (Doré et al. 2011; Ekström and Ekbom 2011; Bommarco et al. 2013; Gaba et al. 2014).
In multiple cropping systems, plant diversity is designed and managed to improve crop production and reduce harmful environmental impacts based on the hypothesis that positive interactions between plants for resource acquisition and mobilization of natural regulation can replace agrochemical inputs (Malézieux et al. 2009). Plant diversity can provide a range of ecosystem services based on the type (positive, neutral, or negative) and degree of plant–plant interactions and on the local environmental and management conditions (Tilman 1999; Diaz et al 2006). Attempts have been made to quantify the links between biodiversity and ecosystem services (De Bello et al. 2010; Cardinale et al. 2012; Balvanera et al. 2006), and several conceptual frameworks have been proposed recently to link biodiversity to ecosystem functioning (Diaz et al. 2013). To move forward, we now need to understand and formalize this relationship which is not straightforward (Mace et al. 2012). The delivery of ecosystem services depends largely on the interaction between biodiversity and local environmental conditions, which affect ecosystem functioning, and on socioeconomic conditions which determine the ecosystem services that are targeted and their target values. The main challenge for the transition toward a more sustainable agriculture is to determine the plant diversity and associated management practices that could deliver a set of targeted services in given environmental and socioeconomic conditions.
Multiple cropping systems can produce crops at the same time as providing several ecosystem functions in the same space. Although biodiversity in agroecosystems can be based on a mixture of ligneous and herbaceous species, with life spans varying from a few weeks to several decades, this paper focuses on cropping systems that are based on annual herbaceous plants, which are grown primarily to produce grain (cereals, legumes, oil crops, etc.) for food and feed. It addresses the main ecological processes underlying the functioning of multiple cropping systems based on annual crops and discusses how the selection of appropriate species, the spatiotemporal arrangement, and the associated agricultural practices can ensure and enhance specific functions to provide the ecosystem services targeted. It proposes a classification of multiple cropping systems based on their composition and spatiotemporal arrangement. It then analyzes the ecological processes and management strategies that are fundamental to the functioning of multiple cropping systems based on a literature review. Finally, it suggests how agroecological engineering can link the ecosystem services targeted to multiple cropping systems to provide guidelines for future land management strategies and agricultural policies.
Plant diversity in multiple cropping systems
Multiple cropping systems consist of growing two or more cultivars or species with a spatial and temporal association. Many studies have classified these systems on the basis of their species composition, design, and management (Andrews and Kassam 1976; Poveda et al. 2008; Malézieux et al. 2009; Lithourgidis et al. 2011). This paper focuses on plant diversity in fields and field margins in cropping systems based on annual and herbaceous plants (Figs. 1 and 2) and proposes a classification based on three distinct spatiotemporal arrangements which can be combined (Fig. 3).
In group A, plants are cultivated simultaneously in the field during the growing season, with one crop a year in temperate regions and two or three in humid tropical regions. The cultivar or plant species are totally mixed (mixed intercropping) or arranged in alternate rows or in strips (row intercropping) (Ghaley et al. 2005; Pelzer et al. 2012). The number of associated plant species or cultivars can vary, but there are usually two species, such as a cereal and a legume, or two to four cultivars of the same species (Zhu et al. 2000; Mundt 2002). In group B (relay or sequential cropping), plants are not grown together at the same time but in crop sequences. Sequences may include productive plants (grain, forage) and cover crops. The aim of a “cover crop” is not to produce food, feed fodder, or fiber but to provide a service such as soil protection by ensuring that the soil is not left bare between two crops. The cover crop can share a part of its cycle with the crop as in the case of relay cropping. For example, N-fixing species such as Cajanus cajan can be sown at the end of a maize crop cycle in humid tropical regions to combine maize grain production with a reduction in N fertilizer and better soil cover (Baldé et al. 2011). In group C, crops are surrounded by assemblages of plants such as sown grass strips, hedges, and trap plants that have a specific role. For example, grass strips sown on the edges of arable fields help farmland biodiversity by providing shelter and food (Marshall et al. 2006). Multiple cropping systems can, therefore, combine several species or cultivars simultaneously in the same area (group A) or in the surrounding area (group C) or sequentially in the crop sequence (group B). Apart from differences in their functions, the decision on which multiple cropping system to use depends largely on socioeconomic conditions and access to input, machinery, and labor.
From biodiversity to ecosystem services
Haines-Young and Potschin (2010) proposed a cascade model that describes the relationships between ecosystem structures and processes, ecosystem functions, and human well-being through ecosystem services, including their social and economic evaluations. Biodiversity is central to this cascade: It is not restricted to the number of species but considered in its broadest sense, covering many different aspects of the ecosystem structure and processes such as the composition of populations, communities, functional groups, and types of interactions (Haines-Young and Potschin 2010). This cascade was adapted to cover multiple cropping systems by considering the physical and biological aspects of the agroecosystem structures and processes, their interactions, and the effect of land management (Fig. 4).
Although the primary aim of multiple cropping systems is to provide provisioning services (crop production), farmers and stakeholders expect these agroecosystems to provide other key ecosystem services. These are mainly regulating services that may include pest and disease regulation, erosion control, climate regulation, and maintenance of soil fertility. Associating species or cultivars can provide functions that help to deliver these services. The delivery of services is not only affected by the number of associated species (or cultivars) but also highly dependent on the diversity of functions. The functional diversity is not linearly related to the genetic and taxonomic diversities (Isbell et al. 2011). Moreover, a number of functions can contribute to a given ecosystem service, whereas a single function can provide a range of services (De Bello et al. 2010). Furthermore, there are important interrelationships between ecosystem services: One service can be beneficial to another (synergy), such as pollination for crop production. However, in agroecosystems, relationships between ecosystem services are often antagonistic (giving rise to the requirement for trade-offs). For instance, crop production increases with increasing use of fertilizers or pesticides, which in return causes pollution and ultimately degrades water or air quality and the biogeochemical cycles of nutrients. Land management practices such as fertilization or crop rotation can drive changes in one or several ecosystem services (Bennett et al. 2009).
The following sections focus on the biophysical evaluation of the system (Fig. 4, left box) and detail the ecological processes and management strategies underlying the functioning of multiple cropping systems related to provisioning services (mainly crop production) in low-input cropping systems. A set of examples of multiple cropping systems is given each function, based on a literature review.
Multiple cropping systems and ecosystem services
Multiple cropping systems to reduce the consumption of fertilizers and water
In single-species cropping systems, all individual plants have similar properties and use the same resources. As the use of external inputs, such as fertilizers and water, increases biomass production at a high resource acquisition rate, intraspecific competition can be reduced by the management of plant population density and/or planting design. Whereas single-species cropping systems are intended to increase the production of exported biomass in an optimized environment based on external resources, multiple cropping systems use plant interactions to increase crop production with lower inputs of water and nutrients. Consequently, the spatial and temporal mix of species selected for an association should use separate resources or encourage mutual growth, and/or the sowing densities and spatial arrangements should reduce competition and lessen the detrimental effects on the environment such as nitrate leaching and greenhouse gas emissions (Fig. 5).
Species may coexist when the species use different forms of a resource (complementary niches; Tilman 1990; Leibold 1995). Resource partitioning can occur when species use the same resource at different times or places (Chesson 2000), by physiological or morphological differentiation (e.g., rooting depth: Fargione and Tilman 2005; chemical form of nitrogen used: Jumpponen et al. 2002; Kahmen et al. 2006) or by resource use plasticity (Ashton et al. 2010). Complementary resource usage within a multiple cropping system requires a high functional divergence of traits related to resource use and is often related to overyielding (Hooper and Dukes 2004) and resistance to invasion by additional species (Dukes 2001). Cereal–legume associations are a well-known example of a multiple cropping system based on complementary functioning that optimizes the use of nitrogen at field scale over a growing season (Fig. 3—group A). For instance, in multisite field experiments, Hauggaard-Nielsen et al. (2009) reported that the use of total N resources was 30–40 % more efficient for intercropped pea and barley than for pea and barley grown as sole crop. In such systems, the cereals have a deeper, faster root system than the legume, a higher demand for N at the beginning of the crop cycle, and are more competitive for the soil mineral nitrogen, and so the legumes have to rely on symbiotic fixation of atmospheric nitrogen to a greater extent than when grown as a sole crop (Bedoussac and Justes 2010a, b). Furthermore, as the cereals are sown at a lower density than when grown as a sole crop, each cereal plant has access to more soil nitrogen. With the addition of little or no nitrogen fertilizer, these systems are more productive than monoculture with improved cereal growth, grain yield, and grain quality. For example, Bedoussac and Justes (2010a, b) showed that, when intercropped with winter pea with low nitrogen fertilizer input, durum wheat increased its yield by 19 % and accumulated up to 32 % more nitrogen than when cropped alone. However, with high nitrogen fertilizer input, these systems do not produce more than sole crops and may even produce less, because the mineral nitrogen availability is nonlimiting which changes the competitive interactions and niche differentiation, and the increased growth of the cereal may reduce the growth of the legume (Bedoussac and Justes 2010b). In an experimental system, Pelzer et al. (2012) showed that the yield of fertilized wheat (average 5.4 mg ha−1) was not significantly different from the yield of fertilized intercropped pea/wheat (average 4.5 mg ha−1), when the amount of nitrogen fertilizer applied was 140 kg N ha−1 for wheat as a sole crop and 60 kg N ha−1 for the pea/wheat intercrop. The yield of unfertilized wheat (average 3.9 mg ha−1) was significantly lower than that of unfertilized intercropped pea/wheat (average 4.4 mg ha−1).
Species can also coexist by facilitation where one or several species provide resources or improve the environmental conditions for the other species by modifying their local biotic and/or abiotic environment, and/or the availability of limiting resources (Callaway 1995; Brooker et al. 2008). For instance, the facilitation of water acquisition in drought conditions by hydraulic lift has been reported for species with different root system architectures (Caldwell et al. 1998 and references therein; Pang et al. 2013; Sekiya et al. 2011). Isotope labeling methods demonstrated that species with deep root systems transfer water from deeper wet soil layers to shallow dry layers, which benefits neighboring plants (in particular species with shallow root systems) (Dawson 1993; Sekiya and Yano 2004). Indirect modifications of plant growth resulting in deeper root profiles (Boller and Nösberger 1988), as well as microclimates (Tournebize 1995), can also lead to a more efficient use of water in multispecies systems. For example, when maize is intercropped with pigeon pea, the water use efficiency is double that of maize grown as a sole crop (Baldé et al. 2011). Moreover, positive interactions occurring between species of the same trophic level (i.e., plant species in this case) can be mediated by symbiotic microorganisms such as nitrogen-fixing bacteria, mycorrhizal fungi, and other soil biota. For instance, facilitation has been reported for nutrients such as nitrogen, for which several studies have measured the transfer from one species to the other, using 15N labeling. In cereal–legume associations (Fig. 3—group A), such flows can reach up to 20 % of the nitrogen contained in the cereal derived from the legume (Hauggaard-Nielsen and Jensen 2005), which has itself been obtained by symbiotic fixation of atmospheric nitrogen by rhizobia. Most of these results were obtained in pot experiments, some of which showed that common mycorrhizal networks could contribute to a significant proportion of such plant–plant transfers (Li et al. 2009). However, it is difficult to quantify such transfers in field conditions, and so the effect has not been established in the field. Facilitation may also occur for phosphorus in cereal–legume associations (Fig. 3—group A). In a 4-year field experiment, intercropped maize and faba bean increased their yield by 43 and 26 %, respectively, on a low-phosphorus, high-nitrogen soil, compared to sole crops (Li et al. 2007). Comparing solid barriers with mesh barriers between the root species of intercropped species showed that the beneficial effect of faba bean on maize was not due to seasonality or complementary use of rooting space but due to the release of organic acids and protons. However, such facilitation has mainly been reported for pot experiments (Betencourt et al. 2012). Only a small proportion of soil phosphorus is available to crops, and so legumes with greater capability to mobilize part of the large pool of unavailable phosphorus in the soil might improve the availability of this resource for the benefit of cereals in crop associations (Hinsinger et al. 2011). This relies largely on rhizosphere processes of phosphorus mobilization involving root proximity and intermingling, as shown by theoretical modeling (Raynaud et al. 2008) or proved by the experiment of Li et al. (2007): Depending on the chemical form of the resource, phosphorus uptake by maize increased from 12 to 116 % through the faba bean rhizosphere processes. These were either directly affected by root activities (e.g., exudation of a phosphorus-mobilizing compound) or mediated by rhizosphere microbial activities (e.g., phosphatase activities involved in the mobilization of organic phosphorus). He et al. (2013) have recently shown in field conditions that rhizosphere microbial communities were involved in increasing the performance of cereal–legume associations.
Combining these two processes also explains the performance of multiple cropping systems such as diversified crop sequences (Fig. 3—group B). This is particularly true for systems designed to improve nutrient capture and cycling by symbiotic fixation of atmospheric nitrogen by legumes and subsequent delivery of nitrogen-rich residues to the following cereal (Peoples et al. 2009). In crop sequences including temporal grasslands, relay cropping, or using cover crops (Fig. 3—group B), the performance of the agroecosystems also depends on the priority effect, the effect on the functioning of communities of the order in which the species arrive at a site. This temporal effect is largely related to the use of resources made by the species (Körner et al. 2008), but it has proved difficult to predict this variation. This means that theoretical ecology based on niche theory faces a major challenge in understanding interactions between species and their consequences on community structure and functioning (Vannette and Fukami 2014). The priority effect has been shown to be important by recent experimental studies performed on combinations of grasses, legumes, and nonleguminous broadleaf plants which showed that the order of arrival of species has a disproportionate effect on the biomass production of the communities, compared with the effects of the sowing interval and/or plant density (von Gillhaussen et al. 2014).
In conclusion, crop production and quality in environments with low nutrient/water resource availability can be improved through ecological interactions such as facilitation of resource acquisition—at least for the benefit of one species or cultivar and complementary use of resources. However, species or cultivars must be selected to ensure that their functional traits and strategies for resource acquisition are complementary (group A). Furthermore, to optimize the use of a given resource by crops, the temporal (group B) and spatial (group C) distribution of the resource must be taken into account when selecting the association of species or cultivars.
Multiple cropping systems to reduce the use of pesticides
Multiple cropping systems can regulate pests, in the broadest sense, by preventing their growth, reproduction, or dispersal (Fig. 6). Plant composition and structural organization at field scale during the growing season (group A) or in the crop succession (group B) and at landscape scale (group C) may have direct or indirect effects on crop pests. The basic principle consists in promoting habitats that are unsuitable for pests and/or suitable for pest control auxiliaries. By selecting relevant plant species, multiple cropping systems can modify pest foraging or reproduction directly (i.e., bottom-up control) or increase the abundance of the natural enemies of the pests which are mainly insect herbivores (i.e., top-down control) (Fig. 6).
Pest dispersal and reproduction can be reduced by resource dilution and spatial disruption i.e. habitat fragmentation. Resource dilution of a host plant in the plant mixture potentially makes the pest less efficient in locating and colonizing its host (Trenbath 1993; Ratnadass et al. 2012). Resource dilution has been shown to be an appropriate means of managing many pests, such as aphids (A’Brook 1968; Smith 1976) and other phytophageous insects (Altieri 1999). Multiple cropping systems can also reduce dispersal by creating physical barriers (groups A and C) through the structure and layout of the planting scheme or by modifying the microclimates in plant associations. These physical barriers create habitat fragmentation which can prevent the spread of disease or make it difficult for insects to find food or mating sites (Francis 1990) and has been shown to be efficient at controlling airborne diseases. For instance, cereal crops can disrupt insects in their visual search for smaller crops (Ogenga-Latigo et al. 1992) or prevent dispersal by wind. Resource dilution and habitat fragmentation were both shown to contribute to the efficient control of disease in crop associations in low-input farming, with various success stories for cereals (Zhu et al. 2000; Mundt 2002).
Pests can be reduced by life cycle disruption using crop sequences within a field (group B in Fig. 6). Diversification of crop sequences can lead to pest reduction (Bennett et al. 2012) and is critical for controlling soilborne diseases (Curl 1963; Bullock 1992). Selecting the crops in a sequence should take account of the effect of the preceding crop on the development of pests detrimental to the following crop. For example, fusarium head blight is very severe for wheat sown after maize (Pirgozliev et al. 2003). Moreover, multiple cropping systems may contain species that produce biochemical cues that disrupt the development of diseases, pests, root parasitic nematodes, and weeds (Ratnadass et al. 2012). These allelopathic effects are created mainly by the introduction of particular species into the intercrop (group A) or the crop sequence (group B). For instance, Gomez-Rodriguez et al. (2003) reported the decrease of early blight of tomatoes in tomato–marigold intercropping due to allelopathy as well as the creation of microclimates. Cover cropping or relay cropping can also control diseases (e.g., green manure as a control strategy for soil borne diseases: Motisi et al. 2009) or root nematodes (Yeates 1987; Rodriguez-Cabana and Kloepper 1998) through allelopathy (Fig. 6, group B). Crop sequences including nonhost plants may reduce the inoculum of telluric pathogens such as nematodes as in the rotation of strawberry with oats (Lamondia et al. 2002) or pineapple and sugarcane with banana. Plants may have suppressive effects which lead to the reduction of soil inoculum through the emission of biocides. In Martinique, plants with biocidal properties have been shown to control bacterial wilt caused by Ralstonia solanacearum, responsible for significant losses elsewhere in the world in tomato and other vegetable crops (Deberdt et al. 2012).
Pests (Fig. 6) can be controlled using the pull or push–pull strategies. Push–pull uses repellent “push” plants to discourage pests from settling on crops and “pull” plants to attract them to neighboring plants (Cook et al. 2007; Shelton and Badenes-Perez 2006). The stimuli emitted by plants may be visual, chemical, or trophic. Introducing another plant species can create a new habitat, which may ultimately also modify the populations of predators. One example of a pull strategy is trap cropping. Trap crops are planted to attract or intercept targeted insects or pathogens and prevent them from completing their life cycle, to reduce damage to the main crop (Shelton and Badenes-Perez 2006). For instance, planting alfalfa or sorghum in combination with cotton is a technique that has been widely used in Australia and the USA (Deguine et al. 2008). A pull strategy was developed to combat Chilo sacchariphagus (spotted borer), a significant sugarcane pest. Female borers were pulled to nesting sites on a trap plant, Erianthus arundinaceus, which was planted around the perimeter of the sugarcane plot achieving a 90 % reduction in attacks with a 20 % increase in yield (Ratnadass et al. 2013). The effects were observed up to 40 m from the edge of the plot (Nibouche et al. 2012). Repelling insect pests can be coupled with attracting pest predators in crop associations. Planting sunflowers in an organic vegetable cropping system increased the abundance of, and encouraged greater foraging activity by, native insectivorous birds (Jones and Sieving 2006). Other crops such as pigeon pea (Cajanus cajan), and maize and okra (Abelmoschus esculentus) attract Helicoverpa armigera, which is a pest for cotton and tomato (Pike et al. 1987). Predators such as ground beetles e.g. carabids and spiders are also attracted when fields are surrounded by hedgerows or noncropped areas (Burel and Baudry 1995). Establishing strips of weeds also encourages the development of auxiliary organisms, by increasing the nectar and pollen resources for many species of insect (Wackers et al. 2007 quoted by Deguine et al. 2008).
Multiple cropping systems to reduce environmental impacts
Intensive farming practices associated with monospecies cropping systems have had considerable harmful effects on the environment such as landscape simplification, loss of habitat for many species, increased water consumption, soil erosion and degradation, and pollution due to the extensive use of inputs use such as mineral fertilizers, fossil fuels, and pesticides (Tilman et al. 2002).
Multiple cropping systems can reduce these effects (Fig. 7). They can reduce soil erosion and the associated loss of nutrients (Dabney 1998) and act directly on soil fertility by improving soil organic matter and promoting N2 fixation by legumes. Increasing soil organic matter is also a key to preserving soil fertility (Mann 1986). It is encouraged by systems that minimize soil disturbance and maximize the retention of crop residues (mulching, Fig. 7—group B) and increased efficiency in the use of nutrients (Jarecki and Lal 2003). This can be achieved by efficient management practices such as diversifying crop successions, reducing tillage, and planting cover crops (group B) (West and Post 2002; Jarecki and Lal 2003). Furthermore, legume crops (groups A or B, as green manure) can increase N pools and N use efficiency in rotation (Drinkwater et al. 1998; Dabney et al. 2001). In a recent study in Australia, the successive introduction of no-till, cover crops, and legume breaks in the rotation increased the grain yield of wheat by about 500, 1000, and 900 kg ha−1, respectively, compared to the low-input baseline yield (Kirkegaard et al. 2014).
Multiple cropping systems can also help to preserve the quality of ground and drinking water. Nitrate concentration is a major concern as it is considered harmful to human health and responsible for the eutrophication of aquatic ecosystems. The amount of NO3-nitrate leached from agroecosystems appears to be greatest when there is an accumulation of nitrate in the soil profile that coincides with, or is followed by, a period of high drainage (Di and Cameron 2002). Multiple cropping systems using cover crop or relay intercropping (group B) can mitigate nitrate losses by drainage. A typical winter cover crop can, for instance, decrease NO3− leaching by 25 kg N ha−1 (Dabney et al. 2001; Dinnes et al. 2002). The main advantages of these systems over conventional crop sequences result from a combination of increased plant N capture throughout the year through nutrient cycling and N2 fixation, reduced N fertilizer input, and a gradual release of organic N that is often better synchronized, than fertilizer application with crop demand and microbial population dynamics. They may also have the advantage of reducing pesticide use and transfer to water (Dabney et al. 2001).
Finally, although multiple cropping systems may sometimes foster populations of undesirable organisms (e.g., slugs in cover crops, Walter et al. 1993), they generally help to increase aboveground and belowground biodiversity, improving agroecosystem regulation, and delivering an ecosystem service per se (Mace et al. 2012). Increasing functional diversity in multiple cropping systems (groups A, B, and C) promotes biodiversity in the agroecosystem and increases food web complexity by providing new habitats for a variety of animals and soil organisms that would not be present in a single crop environment (Altieri 1999; Sokos et al. 2013). In particular, spatial diversity (group C) can maximize nesting opportunities for birds and create habitats for a range of invertebrates (Vickery et al. 2009). It can also increase the diversity and abundance of pollinators (Potts et al. 2010), which in turn may increase crop production by up to 40 % (Bretagnolle and Gaba, submitted).
Guidelines for designing multiple cropping systems
Setting up multiple cropping systems to maintain crop production while significantly reducing inputs (mineral fertilizers, water, energy, and pesticides) and providing regulation and cultural services requires much more than an understanding of species coexistence and the identification of species functions. This challenge raises a number of questions: How “different” is “different enough” to allow species to coexist and increase biomass production? What is the planting density for each species to limit competition for resources and/or improve pest regulation? How should species be spatially and temporally organized? Will the delivery of ecosystem services (independently or in synergy) be improved when species are grown at the same time in a field, in sequence or in separate areas in the field and its surrounding? What agricultural practices should be used to improve the provisioning of ecosystem services? Are theoretically designed multiple cropping systems feasible in practice (availability of machinery, work organization, economical sustainability)? How can specific design methods for multiple cropping systems be set up?
These questions can only be answered by multidisciplinary research, combining quantitative genetics, community ecology, functional ecology, landscape ecology, population dynamics and agronomy, etc. Furthermore, although cropping systems share biophysical aspects with natural systems through resources, functions, and services, they also share management aspects with industrial systems as they are set up and managed by farmers (Le Gal et al. 2010) who can act both on their structure and on inputs/outputs, and to some extent on their internal biophysical functions, e.g., by soil tillage. The design and evaluation of multiple cropping systems must take account of this potential for optimizing management practices. Guidelines linking decision-making tools to design approaches for multiple cropping systems must be set up to reconcile the delivery of crop production and other ecosystem services (Fig. 8). The following sections propose guidelines which aim to facilitate the integration of knowledge of the biology and ecology of plant species/communities (and their associated organisms) and knowledge of the effect of farming practices, in order to design and assess multiple cropping systems for given biophysical and socioeconomic environments.
The guidelines (Fig. 8) are presented as an up–down approach using a cascade model for ecosystem services (Fig. 4), starting from the identification of a set of services to be targeted through to the structure and management of a multiple cropping system. This is based on knowledge of individual and combined plant functions, in response to abiotic and biotic conditions in interaction with agricultural practices (Fig. 4). Particular attention should be paid to biophysical relationships within the various ecosystem services, which may be positive (synergy), negative (trade-off), or neutral, and also to trade-offs between the different aims of farmland stakeholders. Given the complexity of the interactions and feedback processes within multiple cropping systems and the difficulty of harnessing them to provide ecosystem services, a three-step design process is proposed in which steps 2 and 3 are interrelated.
Step 1: identification of a set of services and associated functions
Step 1 (Fig. 8) identifies, in consultation with stakeholders, the set of priority services to be provided by the system in the short- and medium-term. These services required of the agroecosystem, together with binding constraints defined by biophysical (e.g., soil texture), social (e.g., labor), and economic (e.g., input and output prices) factors, could be organized as a set of objectives and constraints which will provide further guidance for the design and assessment of the multiple cropping system (Blazy et al. 2009). Each component of this “set of objectives and constraints,” in particular each targeted ecosystem service required of the system, can be identified and evaluated in consultation with stakeholders namely farmers, local residents, industry, environmental organizations, etc. and then translated into assessment indicators, e.g., variables for quantifying the service which can be measured in field experiments (Rapidel et al. 2009) or simulated using appropriate models (Delmotte et al. 2013).
The interactions between services must then be identified. Until now, these interactions have been studied by mapping the various ecosystem services, to identify, for example, “win–win” areas, that are of benefit to both ecosystem services and biodiversity (Naidoo and Ricketts 2006; Lavorel et al. 2011; Eigenbrod et al. 2012). However, these maps are generally built using proxies such as land cover or types of vegetation that are extrapolated from a limited number of data points to large areas (Nagendra et al. 2013). Mapping ecosystem services is not an appropriate approach for multiple cropping systems. Firstly, they are carried out at field scale, which is not relevant for ensuring the delivery of multiple services for the various stakeholders, and secondly, a description of a pattern of ecosystem functions is not sufficient to understand the links between plant diversity, plant functions, and agricultural practices, even at field scale. An ambitious interdisciplinary research effort is needed to give a comprehensive assessment of these links and the synergies and trade-offs in ecosystem functions and their related ecosystem services. It is also necessary to determine the key individual or combined ecosystem functions that deliver these services. Ecological knowledge can be used to assess ecosystem functions (Fig. 4), e.g., the functional traits that underpin different services and their spatial distribution (Lavorel et al. 2011), in order to select species (crops or service plants) or cultivars.
Step 2: selection of species according to the targeted functions
Going further up the cascade in Fig. 4, step 2 (Fig. 8) identifies plant species whose functional characteristics can sustain the services targeted. This can be based on expert knowledge, the literature, or databases as widely proposed for grass and legume mixtures (Louarn et al. 2010 and references therein). However, these approaches are limited given the very large number of combinations of factors which have to be taken into account, as has already been found when considering composite cultivars (Miranda Filho and Chaves 1991). Furthermore, most of the available knowledge concerns the characteristics of a cultivar or a species sown as a sole crop, which is often not sufficient to predict its behavior in a multiple cropping system. It is likely that cultivar and/or species traits targeted for multiple cropping will differ from those required for single cropping systems (Lithourgidis et al. 2011). Moreover, linking plant traits to plant functions in a given multiple cropping system is not straightforward, and breeding crops for multiple cropping systems is a major challenge, as new and complex interactions need to be considered that can be formulated as “f(Species1, Species2,…, Species n ) × (Agricultural practices × Environment)” for species associations and as “f(Genotype1, Genotype2,…, Genotype n ) × (Agricultural practices × Environment)” for cultivar associations, n being the number of interacting species or genotypes and f being the function describing the relationship between them. Two strategies can be suggested in order to design appropriate plant–plant associations.
The first strategy is a classic screening method, assessing how a mixture of crops/varieties can meet a set of targeted ecosystem services at cropping system scale (i.e., rotation). This approach, which is “blind” to traits, is based on the statistical analysis of the ability of the plants to mix using cultivar/species associations in optimized experimental designs. It uses hybrid breeding methods and quantitative genetics and sets out to describe the general mixing ability (GMA, the mean value for all associations) and/or the specific mixing ability (SMA, the interaction between two given species or cultivars). This was first developed for cultivar mixtures (reviewed in Dawson and Goldringer 2012; Gizlice et al. 1989; Knott and Mundt 1990; Lopez and Mundt 2000), but can be extended directly to multiple cropping systems (Gallais 1970; Finckh et al. 2000; Finckh and Wolfe 2006), and temporal successions of crops, even though this has not yet been proposed. Ideotypes can be developed by quantitative trait loci (QTL) detection or genomic selection methodologies, using markers to tag the genomic areas with the greatest positive interactions between genotypes or species (complementation/facilitation). Although this approach is attractive, it has two major limitations: (1) It can be difficult to implement as it requires midterm experiments with several replicates, and (2) only a limited set of factors, such as the effect of tillage or of nitrogen fertilization, and services can be tested.
The second strategy is a trait-based approach, where the species/cultivar assembly relies on the selection of a combination of plant functional traits, i.e., the conception and development of multispecies/cultivar ideotypes. The combination of targeted functional traits can be based on current knowledge of the relationship between traits and functions (Lavorel and Garnier 2002; Suding et al. 2008) or from a mechanistic model (Hammer et al. 2010; Lynch 2013). If a trait value/state (or a combination of trait values) is not found in an available variety/breeding line, a breeding strategy is required specifically for multiple cropping systems. This strategy should combine ecophysiological modeling of multiple cropping systems with quantitative genetics. This approach was shown to be useful for breeding for complex traits, which were broken down into physiologically relevant traits all connected to model parameters that were less sensitive to environmental conditions (Gu et al. 2014). In this second strategy, the development of ideotypes can also benefit from QTL detection or genomic selection methodologies, with markers used to tag the genomic areas controlling targeted traits or parameters in ecophysiological models, e.g., vernalization or photoperiod parameters in models predicting plant earliness (Bogard et al. 2014). In this way, marker-based modeling can be used to predict key parameters of ecophysiological models and then build genotypes with optimum parameter combinations (Letort et al. 2008; Reymond et al. 2003; Prudent et al. 2011) through the selection of the best allelic combinations (Hoogenboom et al. 2004; Chenu et al. 2009). For all these reasons, we believe that a trait-based approach is a promising strategy for building ideotypes for multiple cropping systems, even though the main bottlenecks are still the availability of cultivar trait values and dedicated ecophysiological models.
Step 3: how can spatiotemporal arrangement and management improve ecosystem functions and the delivery of services?
After defining a set of species and conditions in step 2, the agroecosystem functioning can be optimized by management in order to give the expected combination of services defined in step 1. It can first be obtained by adjusting the spatial and temporal combination of species as proposed in the three groups in Fig. 3. Inputs (supply of water at a specific time to limit competition) and outputs (leaving straw on the soil instead of using it for animals) can then be managed, to drive the agroecosystem functions toward delivering the target set of services. The spatial arrangement of species should be planned depending on the traits and functions of the species ranging from “as close as possible” to maximize short distance synergies, e.g., nitrogen transfer between the rhizosphere of legumes and nonlegume plants, and “far enough apart” to avoid competition for resources, e.g., light and water. For example, in intercropped vineyards, the width of the intercrop strip is optimized to reach a trade-off between limiting run-off and limiting grape yield by competition for water (Ripoche et al. 2010). Similarly, the benefits of a temporal succession of species will depend on how the species affect each other and on how the agroecosystem functions. The effect of biodiversity on agroecosystem functioning may not be immediate and can often be observed in the response of species to predation, competition, or parasitism (see Gaba et al. 2014 for further details).
Input management can be adjusted to modify the resource availability, at a specific time and at a specific location in the field, to drive the system functions toward the target. For example, in strip intercropping, a limited amount of nitrogen applied to the cereal component of the association can help to maximize its grain yield without reducing nitrogen fixation by the legume. The output of the system can also be managed to achieve a compromise between exporting biomass of all species to increase the economic efficiency of the agroecosystem and keeping it in the system to provide services such as soil cover to reduce run-off and increase soil organic matter and biodiversity. This is typically the case in conservation agriculture (Giller et al. 2009).
However, the choice of spatiotemporal arrangements depends not only on biological processes but also on labor constraints, on suitable farming equipment, and on the profitability of each species, price generally being a dominant factor. Moreover, adjusting the spatial and temporal combination will affect the choice of species or cultivars which are not all suitable for a given agricultural region because of soil and climate conditions, the location, or market conditions. Decision rules should, therefore, be adapted to local environmental and production conditions and to farmers’ goals in terms of production and other targeted services. Adaptive management of agricultural practices would be a relevant strategy. For instance, sowing cereals and alfalfa in a crop succession in a group B multiple cropping system to reduce nitrogen fertilization and control weeds while maintaining crop yield would only be appropriate if there was a local market for alfalfa hay. Conversely, if no local market is available, a group B multiple cropping system could be selected by sowing a cover crop between two annual crops. In this particular case, the functions relating to nitrogen use and weed control, and the life cycle of the species will be the main criteria for selecting the species. Consequently, ensuring that multiple cropping systems are successful in a wide range of locations, implies rethinking market mechanisms and organization (Horlings and Marsden 2011), and developing local markets (Berthet et al. 2014).
This paper considered how efficient multiple cropping systems could be implemented to provide food production as well as ecosystem services and proposed guidelines for agroecological engineering to link biodiversity of targeted ecosystem services in multiple cropping systems with a set of objectives and constraints. Several ecological processes, including biotic interactions such as facilitation, parasitism, and dilution, are involved in multiple cropping systems. This provides a wide range of opportunities for associating plant species or cultivars to deliver ecosystem functions which can be improved by management using appropriate agricultural practices, e.g., timing of inputs or crop density. However, to achieve this target, a greater understanding is required through a multidisciplinary approach combining genetics, ecology, and agricultural sciences, and market mechanisms and organization need to be reviewed.
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This work was supported by INRA Environment and Agronomy Division. We would like to thank the two anonymous reviewers and the editor for their helpful and constructive comments on the earlier version of our manuscript. The revised manuscript has been corrected by Tony Tebby.
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Gaba, S., Lescourret, F., Boudsocq, S. et al. Multiple cropping systems as drivers for providing multiple ecosystem services: from concepts to design. Agron. Sustain. Dev. 35, 607–623 (2015). https://doi.org/10.1007/s13593-014-0272-z
- Ecosystem services
- Biotic interactions
- Plant associations
- Cropping systems