Urban Ecosystems

, Volume 16, Issue 4, pp 681–702 | Cite as

Ecosystem services of urban green spaces in African countries—perspectives and challenges

  • Sarel Cilliers
  • Juaneé Cilliers
  • Rina Lubbe
  • Stefan Siebert
Article
First Online:

Abstract

The concept of ecosystem goods and services is increasingly used to describe how biodiversity and ecosystems are linked to human well-being and that it should be placed at the core of sustainable urban development. Predictions of a tremendous future increase of urbanization in Africa necessitate an investigation into the research on ecosystem goods and services in the urban green infrastructure of Africa. Ecosystem goods and services (ES) are described as the benefits humans derive directly or indirectly from ecosystem functions and are classified as supporting, provisioning, regulating and cultural services. A literature study focusing on journal papers was conducted. Additionally a case study based on two masters studies was further refined. ES studies in African cities are biased towards South Africa and include assessments and economic valuations in which several different methods were used to determine direct consumptive and non-consumptive and indirect use values. Emphasis was placed on the multifunctional nature of ES. The main objectives of these studies were to sensitize policy makers, planners and the general public about the importance of biodiversity and ES. Ecosystem-based adaptation is discussed as the most appropriate approach in terms of applying knowledge about ES and their values in African cities as many residents still rely on ES from natural areas, but the major ecological, economic and political challenges are acknowledged. A case study focusing on domestic gardens (private green spaces) have indicated that the demand and supply of certain ES differ along a socio-economic gradient due to poor service delivery and smaller plots in the poorer areas mainly due to the legacy of separate development of the past. Where provisioning services are mainly outsourced in cities, it was found that plant species useful as food, medicine, etc. were more frequent in the gardens of poorer residents than in those of more affluent areas. The tendency to pay more for residential properties close to public open spaces, as in Europe, could not be statistically proven in the more affluent areas of a South African city, although the property values in proximity of public open spaces in some of the areas studied were lower than further away.

Keywords

Ecosystem services Urban areas African countries Public green spaces Private green spaces Biodiversity Domestic gardens 
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References

  1. Allsopp MH, De Lange WJ, Veldtman R (2008) Valuing insect pollination services with cost replacement. PLoS One 3(9):e3128. doi: 10.1371/journal.pone.0003128 PubMedGoogle Scholar
  2. Bhatti M, Church A (2004) Cultivating natures: homes and gardens in late modernity. Sociol 35(2):365–383Google Scholar
  3. Bolund P, Hunhammar S (1999) Ecosystem services in urban areas. Ecol Econ 29:293–301Google Scholar
  4. Bromilow C (2001) Problem plants of South Africa. A guide to the identification and control of more than 300 invasive plants and other weeds. Briza Publications, PretoriaGoogle Scholar
  5. Cabe Space (2005) Paying for parks: Eight models for funding urban green space. London: Route: London, p 6 http://www.cabe.org.uk/files/Paying-for-parks-full-report.pdf Accessed 20 Apr 2009
  6. Cho S, Poudyal NC, Roberts RK (2008) Spatial analysis of the amenity value of green open space. Ecol Econ 66:403–416Google Scholar
  7. Cilliers EJ (2009) Bridging the green-value-gap: a South African approach. Int J Soc Human Sc 3:615–620Google Scholar
  8. Cilliers EJ (2010a) Rethinking sustainable development: the economic value of green spaces. Dissertation, North West University, South Africa. (http://hdl.handle.net/10394/4567)
  9. Cilliers SS (2010b) Social aspects of urban biodiversity: An overview. In: Müller N, Werner P, Kelsey JG (eds) Urban biodiversity and design. Wiley-Blackwell, Oxford, pp 81–100Google Scholar
  10. Cilliers SS, Bouwman H, Drewes JE (2009) Comparative urban ecological research in developing countries. In: McDonnell MJ, Hahs AK, Breuste JH (eds) Ecology of cities and towns: A comparative approach. Cambridge University Press, Cambridge, pp 90–111Google Scholar
  11. Cilliers SS, Drewes JE, Du Toit MJ, Cilliers DP (2011) Urban ecology: Policy issues resolved and unresolved. In: Geyer HS (ed) International handbook of urban policy, Volume 3: Issues in the developing world. Edward Elgar Publishing, Cheltenham, pp 225–245Google Scholar
  12. Cilliers SS, Siebert SJ, Davoren E, Lubbe CS (2012) Social aspects of urban ecology in developing countries, with an emphasis on urban domestic gardens. In: Richter M, Weiland U (eds) Applied urban ecology: A global framework. Wiley-Blackwell, Chichester, pp 123–138Google Scholar
  13. Colding J (2007) Ecological land-use complementation for building resilience in urban ecosystems. Landscape Urban Plann 81:46–55Google Scholar
  14. Colding J (2011) The role of ecosystem services in contemporary urban planning. In: Niemelä J, Breuste JH, Elmqvist T, Guntenspergen G, James P, McIntyre N (eds) Urban ecology: Patterns, processes and applications. Oxford University Press, New York, pp 228–237Google Scholar
  15. Costanza R, d’Arge R, de Groot R, Farber S, Grasso M, Hannon B, Limburg K, Naeem S, O’Neill RV, Paruelo J, Raskin RG, Sutton P, van den Belt M (1997) The value of the world’s ecosystem services and natural capital. Nature 387:253–260Google Scholar
  16. Cowling RM, Egoh B, Knight AT, O’Farrell PJ, Reyers B, Rouget M, Roux DJ, Welz A, Wilhelm-Rechmann A (2008) An operational model for mainstreaming ecosystem services for implementation. P Natl Acad Sci USA 105(28):9483–9488Google Scholar
  17. Crane P, Kinzig A (2005) Nature in the metropolis. Science 308:1225–11225PubMedGoogle Scholar
  18. Daniels GD, Kirkpatrick JB (2006) Comparing the characteristics of front and back domestic gardens in Hobart, Tasmania, Australia. Landscape Urban Plan 78:344–352Google Scholar
  19. Davenport NA, Shackleton CM, Gambiza J (2012) The direct use value of municipal commonage goods and servcies to urban households in the eastern cape, South Africa. Land Use Policy 29:548–557Google Scholar
  20. De Groot RS, Wilson MA, Boumans RMJ (2002) A typology for the classification, description and valuation of ecosystem functions, goods and services. Ecol Econ 41:393–408Google Scholar
  21. De Groot RS, Alkemade R, Braat L, Hein L, Willemen L (2010) Challenges in integrating the concept of ecosystem services and values in landscape planning, management and decision making. Ecol Complex 7:260–272Google Scholar
  22. Defrancesco E, Rosato P, Rossetto L (2006) The appraisal approach to valuing environmental resources. In: Valuing complex natural resource systems: The case of the Lagoon of Venice, Cheltenham, UK: Edward Elgar Publishing, pp 40–57Google Scholar
  23. Dobbs C, Escobedo FJ, Zipperer WC (2011) A framework for developing urban forest ecosystem services and goods indicators. Landscape Urban Plan 99:196–206Google Scholar
  24. Drechsel P, Dongus S (2010) Dynamics and sustainability of urban agriculture: examples from sub-Saharan Africa. Sustain Sci 5:69–78Google Scholar
  25. Egoh BN, Reyers B, Rouget M, Richardson DM, Le Maitre DC, Van Jaarsveld AS (2008) Mapping ecosystem services for planning and management. Agric Ecosyst Environ 127:135–140Google Scholar
  26. Egoh BN, Reyers B, Rouget M, Richardson DM (2011) Identifying priority areas for ecosystem service management in South African grasslands. J Environ Manage 92:1642–1650PubMedGoogle Scholar
  27. Elmqvist T (2011) Introduction to Ecosystem services, and social systems in urban landscapes. In: Niemelä J, Breuste JH, Elmqvist T, Guntenspergen G, James P, McIntyre N (eds) Urban ecology: Patterns, processes and applications. Oxford University Press, New York, pp 191–192Google Scholar
  28. Escobedo FJ, Kroeger T, Wagner JE (2011) Urban forests and pollution mitigation: analyzing ecosystem services and disservices. Environ Pollut 159:2078–2087PubMedGoogle Scholar
  29. Farber SC, Costanza R, Wilson MA (2002) Economic and ecological concepts for valuing ecosystem services. Ecol Econ 41:375–392Google Scholar
  30. Fausold CJ, Lilieholm R (1999) The economic value of open space: a review and synthesis. Environ Manage 23(3):307–320PubMedGoogle Scholar
  31. Fisher B, Turner RK, Morling P (2009) Defining and classifying ecosystem services for decision making. Ecol Econ 68:643–653Google Scholar
  32. Gaston KJ, Warren PH, Thompson K, Smith RM (2005) Urban domestic gardens (IV): the extent of the resource and its associated features. Biodivers Conserv 14:3327–3349Google Scholar
  33. Glen HF (2002) Cultivated plants of southern Africa—names, common names, literature. Jacana, JohannesburgGoogle Scholar
  34. Goddard MA, Benton TG, Dougill AJ (2010) Scaling up from gardens: biodiversity conservation in urban environments. Trends Ecol Evol 25:90–98PubMedGoogle Scholar
  35. Head L, Muir P, Hampel E (2004) Australian backyard gardens and the journey of migration. Geogr Rev 94(3):326–347Google Scholar
  36. Hougner C, Colding J, Söderqvist T (2006) Economic valuation of a seed dispersal service in the Stockholm National Urban Park, Sweden. Ecol Econ 59:364–374Google Scholar
  37. Jo H-K, McPherson EG (2001) Indirect carbon reduction by residential vegetation and planting strategies in Chicago, USA. J Environ Manage 61:165–177PubMedGoogle Scholar
  38. Kestermont B, Frendo L, Zaccaï E (2011) Indicators of the impacts of development on environment: a comparison of Africa and Europe. Ecol Indic 11:848–856Google Scholar
  39. Kinzig AP, Warren PS, Martin CA, Hope D, Katti M (2005) The effects of human socioeconomic status and cultural characteristics on urban patterns of biodiversity. Ecol Soc 10(1):23, [online] URL: http://www.ecologyandsociety.org/vol10/iss1/art23/ Google Scholar
  40. Kirkpatrick JB, Daniels GD, Zagorski T (2007) Explaining variation in front gardens between suburbs of Hobart, Tasmania, Australia. Landscape Urban Plan 79:314–322Google Scholar
  41. Kithiia J, Lyth A (2011) Urban wildscapes and green spaces in Mombasa and their potential contribution to climate change adaptation and mitigation. Environ Urban 23(1):251–265Google Scholar
  42. Korsgaard L, Schou JS (2010) Economic valuation of aquatic ecosystem services in developing countries. Water Policy 12:20–31Google Scholar
  43. Kuruneri-Chitepo C, Shackleton CM (2011) The distribution, abundance and composition of street trees in selected towns of the Eastern Cape, South Africa. Urban For Urban Gree 10:247–254Google Scholar
  44. Lannas KSM, Turpie JK (2009) Valuing the provisioning services of wetlands: contrasting a rural wetland with a peri-urban wetland in South Africa. Ecol Soc 14(2):18, [online] URL: http://www.ecologyandsociety.org/vol4/iss2/art18/ Google Scholar
  45. Le Maitre DC, O’Farrell PJ, Reyers B (2007) Ecosystem services in South Africa: a research theme that that can engage environmental, economic and social scientists in the development of sustainability science? S Afr J Sci 103:367–374Google Scholar
  46. Loram A, Tratalos J, Warren PH, Gaston KJ (2007) Urban domestic gardens (X): the extent and structure of the resource in five major cities. Landscape Ecol 22:601–615Google Scholar
  47. Lubbe CS (2011) Comparison of the urban domestic garden flora along a socio-economic gradient in the Tlokwe City Municipality. Dissertation, North West University, South AfricaGoogle Scholar
  48. Lubbe CS, Siebert SJ, Cilliers SS (2010) Political legacy of South Africa affects the plant diversity patterns of urban domestic gardens along a socioeconomic gradient. Sci Res Essays 5(19):2900–2910Google Scholar
  49. Luttik J (2000) The value of trees, water and open space as reflected by house prices in the Netherlands. Landscape Urban Plan 48(3):161–167Google Scholar
  50. Lyytimäki J, Sipilä M (2009) Hopping on one leg – the challenge of ecosystem disservices for urban green management. Urban For Urban Gree 8:309–315Google Scholar
  51. Mathieu R, Freeman C, Aryal J (2007) Mapping private gardens in urban areas using object-oriented techniques and very high-resolution satellite imagery. Landscape Urban Plan 81:179–192Google Scholar
  52. May J, Rogerson CM (1995) Poverty and sustainable cities in South Africa: the role of urban cultivation. Habitat Int 19(2):165–181Google Scholar
  53. McConnachie MM, Shackleton CM (2010) Public green space inequality in small towns in South Africa. Habitat Int 34:244–248Google Scholar
  54. McDonald RI (2009) Ecosystem service demand and supply along the urban-to-rural gradinet. J Conserv Plan 5:1–14Google Scholar
  55. McDonald RI, Marcotullio P (2011) Global effects of urbanization on ecosystem services. In: Niemelä J, Breuste JH, Elmqvist T, Guntenspergen G, James P, McIntyre N (eds) Urban ecology: Patterns, processes and applications. Oxford University Press, New York, pp 193–205Google Scholar
  56. McKinney ML (2006) Urbanisation as a major cause of biotic homogenization. Biol Conserv 127:247–260Google Scholar
  57. Meadows M (1999) The ecological resource base: biodiversity and conservation. The geography of South Africa in a changing world. Oxford University Press South Africa, Cape TownGoogle Scholar
  58. Mertz O, Ravnborg HM, Lövei GL, Nielsen I, Konijnendijk CC (2007) Ecosystem services and biodiversity in developing countries. Biodivers Conserv 16:2729–2737Google Scholar
  59. Millenium Ecosystem Assessment (2003) Ecosystems and human well-being: A framework for assessment. Island Press, Washington DCGoogle Scholar
  60. Millenium Ecosystem Assessment (2005) Millenium ecosystem assessment synthesis report. Island Press, Washington DCGoogle Scholar
  61. Molebatsi LY, Siebert SJ, Cilliers SS (2010) The Tswana tshimo: a homegarden system of useful plants with a particular layout and function. Afr J Agric Res 5(21):2952–2963Google Scholar
  62. Mougeot LJA (ed) (2005) Agropolis, the social, political and environmental dimesnions of urban agriculture. Earthscan, LondonGoogle Scholar
  63. Niemelä J, Saarela S-R, Söderman T, Kopperoinen L, Yli-Pelkonen V, Väre S, Kotze DJ (2010) Using the ecosystem approach for better planning and conservation of urban green spaces: a Finland case study. Biodivers Conserv 19:3225–3243Google Scholar
  64. Nowak D, Crane DE, Stevens JC (2006) Air pollution removal by urban trees and scrubs in the United States. Urban For Urban Gree 4:115–123Google Scholar
  65. O’Farrell PJ, WJ Dl, Le Maitre DC, Reyers B, Blignaut JN, Milton SJ, Atkinson D, Egoh B, Maherry A, Colvin C, Colwing RM (2011) The posibilities and pitfalls presented by a pragmatic approach to ecosystem service valuation in an arid biodiversity hotspot. J Arid Environ 75:612–623Google Scholar
  66. O’Farrell PJ, Andersen PML, Le Maitre D, Holmes PM (2012) Insights and opportunities offered by a rapid ecosystem service assessment in promoting a conservation agenda in an urban biodiversity hotspot. Ecol Soc 17(3):27Google Scholar
  67. Patel Z (2006) Of questionable value: the role of practitioners in building sustainable cities. Geoforum 37:682–694Google Scholar
  68. Pedlowski MA, Carneiro da Silva VA, Corabi Adell JJ, Heynen NC (2002) Urban forest and environmental inequality in Campos dos Goytacazes, Rio de Janeiro, Brazil. Urban Ecosyst 6:9–20Google Scholar
  69. Philadelphia Parks Alliance (2008) How much value does the City of Philadelphia receive from its park and recreation system? A report by the Trust for Public Land’s Centre for City Park Excellence for the Philadelphia Parks Alliance. Philadelphia, USAGoogle Scholar
  70. Pickett STA, Cadenasso ML, Grove JM, Groffman PM, Band LE, Boone CG, Burch WR Jr, Grimmond CSB, Horn J, Jenkins JC, Law NL, Nilon CH, Pouyat RV, Szlavecz K, Warren PS, Wilson PA (2008) Beyond urban legends: an emerging framework of urban ecology, as illustrated by the Baltimore ecosystem study. BioScience 58:139–150Google Scholar
  71. Pienaar K (2000) The South African what flower is that? Struik Publishers, Cape TownGoogle Scholar
  72. Redwood M (ed) (2009) Agriculture in urban planning, generating livelihoods and food security. Earthscan, LondonGoogle Scholar
  73. Ring I, Hansjürgens B, Elmqvist T, Wittmer H, Sukhdev P (2010) Challenges in framing the economics of ecosystems and biodiversity: the TEEB initiative. Curr Opin Environ Sust 2:15–26Google Scholar
  74. Roberts DC (2008) Thinking globally, acting locally – institutionalizing climate change at the local government level in Durban, South Africa. Environ Urban 20(2):521–537Google Scholar
  75. Roberts DC (2010) Prioritizing climate change adaptation and local level resilience in Durban, South Africa. Environ Urban 2292:397–413Google Scholar
  76. Roberts DC, Diederichs N (2001) Durban’s local agenda 21 programme: tackling sustainable development in a post-apartheid city. Environ Urban 14(1):189–201Google Scholar
  77. Roberts DC, Boon R, Croucamp P, Mander M (2005) Resource economics as a tool for open space planning Durban, South Africa. In: Trzyna T (ed) The Urban Imperative, urban outreach strategies for protected area agencies. IUCN-California Institute of Public Affairs, Sacramento, pp 44–48Google Scholar
  78. Roberts DC, Boon R, Diederichs N, Douwes E, Govender N, McInnes A, McLean C, O’Donoghue S, Spires M (2011) Exploring ecosystem-based adaptation in Durban, South Africa: “learning-by-doing” at the local government coal face. Environ Urban 24(1):1–29Google Scholar
  79. Rogerson CM (1998) Urban agriculture and urban poverty alleviation: South African debates. Agrekon 37(2):171–188Google Scholar
  80. Sandström UF (2002) Green infrastructure planning in urban Sweden. Plann Pract Res 17(4):373–385Google Scholar
  81. Schäffler A (2011) Enhancing resilience between people and nature in urban landcapes. Dissertation, Stellenbosch University, South AfricaGoogle Scholar
  82. Schmidt SJ (2008) The evolving relationship between open space preservation and local planning practice. J Plan Hist 7(2):91–112Google Scholar
  83. Schneider A, Logan KE, Kucharik CJ (2012) Impacts of urbanization on ecosystem goods and services in the U.S. Corn Belt. Ecosystems 15:519–541Google Scholar
  84. Schuyt KD (2005) Economic consequences of wetland degradation for local populations in Africa. Ecol Econ 53:177–190Google Scholar
  85. Shackleton CM, Shackleton S (2006) Household wealth status and natural resource use in the Kat River valley, South Africa. Ecol Econ 57:306–317Google Scholar
  86. Simon D, McGregor D, Nsiah-Gyabaah K (2004) The changing urban-rural interface of African cities: definitional issues and an application to Kumasi, Ghana. Environ Urban 16(2):235–247Google Scholar
  87. Smith RM, Thompson K, Hodgson JG, Warren PH, Gaston KJ (2006) Urban domestic gardens (IX): composition and richness of the vascular plant flora, and implications for native biodiversity. Biol Conserv 129:312–322Google Scholar
  88. StatSoft, Inc. (2011). STATISTICA (data analysis software system), version 10. www.statsoft.com
  89. Stoffberg GH, Van Rooyen MW, Van der Linde MJ, Groeneveld HT (2008) Predicting the growth in tree height and crown size of three street tree species in the City of Tshwane, South Africa. Urban For Urban Gree 7:259–264Google Scholar
  90. Stoffberg GH, Van Rooyen MW, Van der Linde MJ, Groeneveld HT (2010) Carbon sequestration estimates of indigenous street trees in the City of Tswane, South Africa. Urban For Urban Gree 9:9–14Google Scholar
  91. Swift MJ, Izac A-MN, van Noordwijk M (2004) Biodiversity and ecosystem services in agricultural landscapes – are we asking the right questions? Agric Ecosyst Environ 104:113–134Google Scholar
  92. TEEB (2010) The economics of ecosystems and biodiversity: mainstreaming the economics of nature. A synthesis of the approach, conclusions and recommendations of TEEB. Available at: www.teebweb.org
  93. TEEB (2011) The economics of ecosystems and biodiversity: TEEB Manual for Cities – Ecosystem services in urban management. Available at: www.teebweb.org
  94. Thompson C (2002) Urban open space in the 21st century. Landscape Urban Plan 2(7):59–72Google Scholar
  95. Thompson K, Austin KC, Smith RM, Warren PH, Angold PG, Gaston KJ (2003) Urban domestic gardens (I): putting small-scale plant diversity in context. J Veg Sci 14:71–78Google Scholar
  96. Thompson K, Hodgson JG, Smith RM, Warren PH, Gaston KJ (2004) Urban domestic gardens (III): composition and diversity of lawn floras. J Veg Sci 15:373–378Google Scholar
  97. Tibaijuka, A, 2010. Balanced development for Africa: The cities of the future – beyond chaotic urbanisation. 1027th Wilton Park Conference, West Sussex, United Kingdon. Presentation on Balanced Development for Africa. UN-HABITATGoogle Scholar
  98. Tratalos J, Fuller RA, Warren PH, Davies RG, Gaston KJ (2007) Urban form, biodiversity potential and ecosystem services. Landscape Urban Plan 83:308–317Google Scholar
  99. Turner RK, Paavola J, Cooper P, Farber S, Jessamy V, Georgiou S (2003) Valuing nature: lessons learned and future research directions. Ecol Econ 46:493–510Google Scholar
  100. Turpie JK, Marais C, Blignaut JN (2008) The working for water programme: evolution of a payments for ecosystem service mechanism that addresses both poverty and ecosystem service delivery in South Africa. Ecol Econ 65:788–798Google Scholar
  101. Tyrväinen L (1997) The amenity value of the urban forest: an application of the hedonic pricing method. Landsc Urban Plan 37(3–4):211–222Google Scholar
  102. Tzoulas KK, Korpela K, Venn S, Yli-Pelkonen V, Kazmierczak A, Niemelä J, James P (2007) Promoting ecosystem and human health in urban areas using green infrastructure: a literature review. Landscape Urban Plan 81:167–178Google Scholar
  103. United Nations (2008) World urbanization prospects: the 2007 revision. Executive Summary. http://www.un.org/esa/population/publications/wup2007/2007WUP_ExecSum_web.pdf
  104. Van Wilgen BW, Reyers B, Le Maitre DC, Richardson DM, Schonegevel L (2008) A biome-scale assessment of the impact of invasive alien plants on ecossytem servcies in South Africa. J Environ Manage 89:336–349PubMedGoogle Scholar
  105. Van Wyk B-E (2005) Food plants of the world. Briza Publications, PretoriaGoogle Scholar
  106. Van Wyk B-E, Gericke N (2000) People’s plants: a guide to useful plants of Southern Africa. Briza Publications, PretoriaGoogle Scholar
  107. Van Wyk B-E, Van Oudtshoorn B, Gericke N (1997) Medicinal plants of South Africa. Briza Publications, PretoriaGoogle Scholar
  108. Venard (1995) Urban Planning and Environment in Sub-Saharan Africa, UNCEDPaper no. 5 (AFTES) World Bank, Washington D.C.Google Scholar
  109. Webb NL (2011) When enough, is enough? Advocacy, evidence and criticism in the field of urban agriculture in South Africa. Dev South Afr 28(2):195–208Google Scholar
  110. Williams NSG, Schwartz MW, Vesk PA, Mccarthy MA, Hahs AK, Clemants SE, Corlett RT, Duncan RP, Norton BA, Thompson K, McDonnell MJ (2009) A conceptual framework for predicting the effects of urban environments on floras. J Ecol 97:4–9Google Scholar
  111. Wolf KL (2004) Public value of nature: Economics of Urban trees, parks and open space. Design with spirit. Edmond, Environmental Design Research Association, Washington, p 5Google Scholar
  112. Woolley H, Swanwick C, Dunnet N (2003) Nature, role and value of green space in towns and cities: an overview. http://www.atypom-link.com/ALEX/doi/abs/10.2148/benv.29.2.94.54467. Accessed 18 Sept 2009
  113. Wu JG (2011) A landscape approach for sustainability science. In: Weinstein MP and Turner RE (eds.), Sustainability science: The emerging paradigm and the urban environment. SpringerGoogle Scholar
  114. Zagorski T, Kirkpatrick JB, Stratford E (2004) Gardens and the bush: gardeners’ attitudes, garden types and invasives. Aust Geogr Stud 42(2):207–220Google Scholar
  115. Zezza A, Tasciotti L (2010) Urban agriculture, poverty, and food security: empirical evidence from a sample of developing countries. Food Policy 35:265–273Google Scholar
  116. Zobola AM, Mkabela QN (2006) Traditional knowledge transfer of activities practised by Zulu women to manage medicinal and food plant gardens. Afr J Range For Sci 23:77–80Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Sarel Cilliers
    • 1
  • Juaneé Cilliers
    • 1
  • Rina Lubbe
    • 1
  • Stefan Siebert
    • 1
  1. 1.School of Environmental Sciences and DevelopmentNorth-West UniversityPotchefstroomSouth Africa

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