Papyrus is increasingly suggested as an alternative bioenergy
source to reduce the pressure on forest ecosystems. However, there are few
studies on the economic viability of papyrus wetlands and the benefits for
local communities. We construct a village Computable General Equilibrium (CGE)
model to examine whether papyrus harvesting and processing has the potential to
improve local livelihoods and simultaneously counteract pressure on local
forest resources. We apply the CGE model to a village in northern Zambia where
overexploitation of forest resources to produce energy from firewood and
charcoal poses a serious problem. The analysis is based on survey data?from 105 households
collected in 2015. The model results show that papyrus briquetting would be a
possible?alternative biofuel and
that this technology improves household income and utility through?labor?reallocations. Higher
opportunity costs lead to households switching from firewood extraction and
charcoal production activities to papyrus harvesting and processing to produce
bioenergy. Replacing energy supplies from firewood and charcoal with papyrus
briquettes results in substitution effects between forest land and wetland and
thereby reduces the pressure on local forest resources. The CGE approach allows
for an economy-wide ex-ante analysis at village level and can support
management decisions to ensure the success of papyrus bioenergy interventions.
References
[1]
International Energy Agency (2010) World Energy Outlook 2010. IEA/OECD, Paris.
[2]
Cerutti, P.O., Sola, P., Chenevoy, A., et al. (2015) The Socioeconomic and Environmental Impacts of Wood Energy Value Chains in Sub-Saharan Africa: A Systematic Map Protocol. Environmental Evidence, 4, 12. https://doi.org/10.1186/s13750-015-0038-3
[3]
Murphy, J.T. (2001) Making the Energy Transition in Rural East Africa: Is Leapfrogging an Alternative? Technological Forecasting and Social Change, 68, 173-193. https://doi.org/10.1016/S0040-1625(99)00091-8
[4]
International Energy Agency (2014) Africa Energy Outlook: A Focus on Energy Prospects in Sub-Saharan Africa. World Energy Outlook Special Report. IEA/OECD, Paris.
[5]
Wessels, K.J., Colgan, M.S., Erasmus, B.F.N., et al. (2013) Unsustainable Fuelwood Extraction Form South African Savannas. Environmental Research Letters, 8, 1-10. https://doi.org/10.1088/1748-9326/8/1/014007
[6]
HLPE (2017) Sustainable Forestry for Food Security and Nutrition. A Report by the High Level Panel of Experts on Food Security and Nutrition, Rome.
[7]
Jones, M.B., Kansiime, F. and Saunders, M.J. (2018) The Potential Use of Papyrus (Cyperus papyrus L.) Wetlands as a Source of Biomass Energy for Sub-Saharan Africa. GCB Bioenergy, 10, 4-11. https://doi.org/10.1111/gcbb.12392
[8]
Jones, M.B. and Muthuri, F. (1997) Standing Biomass and Carbon Distribution in a Papyrus (Cyperus papyrus L.) Swamp on Lake Naivasha, Kenya. Journal of Tropical Ecology, 13, 347-356. https://doi.org/10.1017/S0266467400010555
[9]
Saunders, M.J., Jones, M.B. and Kansiime, F. (2007) Carbon and Water Cycles in Tropical Papyrus Wetlands. Wetlands Ecology and Management, 15, 489-498. https://doi.org/10.1007/s11273-007-9051-9
[10]
Junk, W.J., An, S., Finlayson, C.M., Gopal, B., Kvet, J., Mitchell, S.A. and Robarts, R.D. (2013) Current State of Knowledge Regarding the World’s Wetlands and Their Future under Global Climate Change: A Synthesis. Aquatic Sciences, 75, 151-167. https://doi.org/10.1007/s00027-012-0278-z
[11]
van Dam, A.A., Kipkemboi, J., Mazvimavi, D. and Irvine, K. (2014) A Synthesis of Past, Current and Future Research for Protection and Management of Papyrus (Cyperus papyrus L.) Wetlands in Africa. Wetlands Ecology and Management, 22, 99-114. https://doi.org/10.1007/s11273-013-9335-1
[12]
Osumba, J.J.L., Okeyo-Owuor, J.B. and Raburu, P.O. (2010) Effect of Harvesting on Temporal Papyrus (Cyperus papyrus) Biomass Regeneration Potential among Swamps in Winam Gulf Wetlands of Lake Victoria Basin, Kenya. Wetlands Ecology and Management, 18, 333-341. https://doi.org/10.1007/s11273-010-9174-2
[13]
Jones, M.B. (1982) The Productivity of Papyrus. Report to the Bilateral Aid Section of the Ministry of Foreign Affairs, Government of Ireland, 18.
[14]
Mnaya, B., Asaeda, T., Kiwango, Y. and Ayubu, E. (2007) Primary Production in Papyrus (Cyperus papyrus L.) of Rubondo Island, Lake Victoria, Tanzania. Wetlands Ecology and Management, 15, 269-275. https://doi.org/10.1007/s11273-006-9027-1
[15]
Perbangkhem, T. and Polprasert, O. (2010) Biomass Production of Papyrus (Cyperus papyrus) in Constructed Wetland Treating Low-Strength Domestic Water. Bioresource Technology, 101, 833-835. https://doi.org/10.1016/j.biortech.2009.08.062
[16]
Millennium Ecosystem Assessment (2005) Ecosystems and Human Well-Being: Wetlandsand Water Synthesis. World Resources Institute, Washington DC.
[17]
Maltby, E. and Acreman, M.C. (2011) Ecosystem Services of Wetlands: Pathfinder for a New Paradigm. Hydrological Sciences Journal, 56, 1341-1359. https://doi.org/10.1080/02626667.2011.631014
[18]
Russi, D., ten Brink, P., Farmer, A., Badura, T., Coates, D., Förster, J., Kumar, R. and Davidson, N. (2013) The Economics of Ecosystems and Biodiversity for Water and Wetlands. IEEP, London.
[19]
Morrison, E.H.J., Upton, C., Pacini, N., Odhiambo-K’oyooh, K. and Harper, D.M. (2013) Public Perceptions of Papyrus Community Appraisal of Wetland Ecosystem Services at Lake Naivasha, Kenya. Ecohydrology & Hydrobiology, 13, 135-147. https://doi.org/10.1016/j.ecohyd.2013.03.008
[20]
Millennium Ecosystem Assessment (2005) Ecosystems and Human Well-Being: Synthesis. Island Press, Washington DC.
[21]
Maclean, I.M.D., Hassall, M., Boar, R.R. and Lake, I.R. (2006) Effects of Disturbance and Habitat Loss on Papyrus-Dwelling Passerines. Biological Conservation, 131, 349-358. https://doi.org/10.1016/j.biocon.2005.12.003
[22]
Mitsch, W.J., Nahlik, A., Wolski, P., Bernal, P., Zhang, L. and Ramberg, L. (2010) Tropical Wetlands: Seasonal Hydrological Pulsing, Carbon Sequestration, and Methane Emissions. Wetlands Ecology and Management, 18, 573-586. https://doi.org/10.1007/s11273-009-9164-4
[23]
Saunders, M.J., Kansiime, F. and Jones, M.B. (2012) Agricultural Encroachment: Implications for Carbon Sequestration in Tropical African Wetlands. Global Change Biology, 18, 1312-1321. https://doi.org/10.1111/j.1365-2486.2011.02633.x
[24]
Kansiime, F., Saunders, M. and Loiselle, S. (2007) Functioning and Dynamics of Wetland Vegetation of Lake Victoria: An Overview. Wetlands Ecology and Management, 15, 443-451. https://doi.org/10.1007/s11273-007-9043-9
[25]
Ryken, N., Vanmaercke, M., Wanyama, J., Isabirye, M., Vanonckelen, S., Deckers, J. and Poesen, J. (2015) Impact of Papyrus Wetland Encroachment on Spatial and Temporal Variabilities of Stream Flow and Sediment Export from Wet Tropical Catchments. Science of the Total Environment, 511, 756-766. https://doi.org/10.1016/j.scitotenv.2014.12.048
[26]
Owino, A.O. and Ryan, P.G. (2007) Recent Papyrus Habitat Loss and Conservation Implications in Western Kenya. Wetlands Ecology Management, 15, 1-12. https://doi.org/10.1007/s11273-006-9001-y
[27]
van Dam, A.A., Kipkemboi, J., Zaal, A.M. and Okeyo-Owuor, J.B. (2011) The Ecology of Livelihoods in East African Papyrus Wetlands (ECOLIVE). Reviews in Environmental Science and Bio/Technology, 10, 291-300. https://doi.org/10.1007/s11157-011-9255-6
[28]
Laws, B. (2011) Fifty Plants that Changed the Course of History. Allen & Unwin, London.
[29]
Gaudet, J. (2014) Papyrus, the Plant that Changed the World: From Ancient Egypt to Today’s Water Wars. Pegasus Books, New York, London.
[30]
Geheb, K. and Binns, T. (1997) “Fishing Farmers” of “Farming Fishermen”? The Quest for Household Income and Nutritional Security on the Kenyan Shores of Lake Victoria. African Affairs, 96, 73-93. https://doi.org/10.1093/oxfordjournals.afraf.a007822
[31]
Rongoei, P.J., Kipkemboi, J., Okeyo-Owuor, J.B. and van Dam, A.A. (2013) Ecosystem Services and Drivers of Change in Nyando Floodplain Wetland, Kenya. African Journal of Environmental Science and Technology, 7, 274-291.
[32]
Barakagira, A. and Kateyo, E. (2008) Impacts of Wetland Drainage on Domestic Water Supplies and People’s Livelihoods in Kabale District, Uganda. Paper Presented at the 12th Biennial Conference of the International Association for the Study of Commons, University of Gloucestershire, UK.
[33]
Ojoyi, M.M. (2006) Sustainable Use of Papyrus (Cyperus papyrus) at Lake Victoriawetlands in Kenya: A Case Study of Dunga and Kusa Swamps. Monetary Institute of Technology and Higher Education, Mexico.
[34]
Kansiime, F. and Nalubega, M. (1999) Wastewater Treatment by a Natural Wetland: The Nakivubo Swamp, Uganda. Ph.D. Thesis, Wageningen Agricultural University, Balkema, Ratterdam.
[35]
Terer, T., Triest, L. and Muthama Muasya, A. (2012) Effects of Harvesting Cyperus papyrus in Undisturbed Wetland, Lake Naivasha, Kenya. Hydrobiologia, 680, 135-148. https://doi.org/10.1007/s10750-011-0910-2
[36]
Terer T., Muthama Muasya, A., Dahdouh-Guebas, F., Ndiritu, G.G. and Triest, L. (2012) Integrating Local Ecological Knowledge and Management Practices of an Isolated Semi-Arid Papyrus Swamp (Loboi, Kenya) into a Wider Conservation Framework. Journal of Environmental Management, 93, 71-84. https://doi.org/10.1016/j.jenvman.2011.08.005
[37]
Thenya, T. and Ngecu, W.M. (2017) Indigenous Strategies and Dynamics of Resource Utilization in Tropical Wetland. A Case Study of Yala Swamp, Lake Victoria Basin, Kenya. International Journal of Arts and Commerce, 6, 21-39.
[38]
Muthuri, F., Jones, M. and Imbamba, S. (1989) Primary Productivity of Papyrus (Cyperus papyrus) in a Tropical Swamp, Lake Naivasha, Kenya. Biomass, 18, 1-14. https://doi.org/10.1016/0144-4565(89)90077-2
[39]
Opio, A., Jones, M.B., Kansiime, F. and Otiti, T. (2014) Growth and Development of Cyperus papyrus in a Tropical Wetland. Open Journal of Ecology, 4, 113-123. https://doi.org/10.4236/oje.2014.43013
[40]
Gaudet, J.J. (1998) When Papyrus Ruled; The Versatile Plant That Strengthened Pharaohs of Egypt. The Washington Post, Washington DC, H01.
[41]
Cohen-Shacham, E., Dayan, T., Feitelson, E. and de Groot, R.S. (2012) Ecosystem Service Trade-Offs in Wetland Management: Drainage and Rehabilitation of the Hula, Isreal. Hydrological Sciences Journal, 56, 1582-1601. https://doi.org/10.1080/02626667.2011.631013
[42]
Gickuki, J., Dahdough Guebas, F., Mugo, J., Rabuor, C.O., Triest, L. and Dehairs, F. (2001) Species Inventory and the Local Uses of the Plants and Fishes of the Lower Sondu Miriu Wetland of Lake Victoria, Kenya. Hydrobiologia, 458, 99-106. https://doi.org/10.1023/A:1013192330498
[43]
Morrison, E.H.J., Upton, C., Odhhiambo-K’hyooh, K. and Harper, D.M. (2012) Managing the Natural Capital of Papyrus within Riparian Zones of Lake Victoria, Kenya. Hydrobiologia, 692, 5-17. https://doi.org/10.1007/s10750-011-0839-5
[44]
Morrison, E.H.J., Banzaert, A., Upton, C., Pacini, N., Pokorny, J. and Harper, D.M. (2014) Biomass Briquettes: A Novel Incentive for Managing Papyrus Wetlands Sustainably? Wetlands Ecology and Management, 22, 129-141. https://doi.org/10.1007/s11273-013-9310-x
[45]
Jones, M.B. (1983) Papyrus: A New Fuel for the Third World. New Scientist, 99, 419-421.
[46]
MIT’s D-Lab (2012). http://d-lab.mit.edu
[47]
Banzaert, A. (2013) Viability of Waste-Based Cooking Fuels for Developing Countries: Combustion Emissions and Field Feasibility. Ph.D. Thesis, Massachusetts Institute of Technology, Cambridge.
[48]
Maclean, I.M.D., Boar, R.R. and Lugo, C. (2011) A Review of the Relative Merits of Conserving, Using, or Draining Papyrus Swamps. Environmental Management, 47, 218-229. https://doi.org/10.1007/s00267-010-9592-1
[49]
Cacciatore, M.A., Scheufele, D.A. and Shaw, B.R. (2012) Labeling Renewable Energies: How the Language Surrounding Biofuels Can Influence Its Public Acceptance. Energy Policy, 51, 673-682. https://doi.org/10.1016/j.enpol.2012.09.005
[50]
Johnston, R., Cools, J., Liersch, S., et al. (2013) WETwin: A Structured Approach to Evaluating Wetland Management Options in Data-Poor Contexts. Environmental Science & Policy, 34, 3-17. https://doi.org/10.1016/j.envsci.2012.12.006
[51]
Rebelo, L.M., McCartney, M.P. and Finlayson, C.M. (2010) Wetlands of Sub-Saharan Africa: Distribution and Contribution of Agriculture to Livelihhoods. Wetlands Ecology and Management, 18, 557-572. https://doi.org/10.1007/s11273-009-9142-x
[52]
Zsuffa, I., van Dam, A.A., Kaggwa, R.C., Namaalwa, S., Mahieu, M., et al. (2014) Towards Decision Support-Based Integrated Management Planning of Papyrus Wetlands: A Case Study from Uganda. Wetlands Ecology and Management, 22, 199-213. https://doi.org/10.1007/s11273-013-9329-z
[53]
Global Panel (2015) Improved Metrics and Data Are Needed for Effective Food System Policies in the Post-2015 Era. Global Panel on Agriculture and Food Systems for Nutrition, London.
[54]
IFPRI (International Food Policy Research Institute) (2016) Global Hunger IndexGetting to Zero Hunger. Washington DC/Dublin/Bonn.
[55]
Robinson, S., Yùnez-Naude, A., Hinojosa-Ojeda, R., Lewis, J.D. and Devarajan, S. (1999) From Stylized to Applied Models: Building Multisector CGE Models for Policy Analysis. The North American Journal of Economics and Finance, 10, 5-38. https://doi.org/10.1016/S1062-9408(99)00014-5
[56]
Dervis, K., de Melo, J. and Robinson, S. (1982) General Equilibrium Models for Development Policy. Cambridge University Press, New York.
[57]
Arndt, C., Farmer, W., Strzepek, K. and Thurlow, J. (2012) Climate Change, Agriculture and Food Security in Tanzania. Review of Development Economics, 16, 378-393. https://doi.org/10.1111/j.1467-9361.2012.00669.x
[58]
Diao, X. and Kennedy, A. (2016) Economywide Impact of Maize Export Bans on Agricultural Growth and Household Welfare in Tanzania: A Dynamic Computable General Equilibrium Model Analysis. Development Policy Review, 34, 101-134. https://doi.org/10.1111/dpr.12143
[59]
Manning, D.T., Taylor, J.E. and Wilen, J.E. (2016) General Equilibrium Tragedy of the Commons. Environmental and Resource Economics, 69, 75-101.
[60]
Winter, E., Faße, A. and Frohberg, K. (2015) Food Security, Energy Equity, and the Global Commons: A Computable Village Model Applied to Sub-Saharan Africa. Regional Environmental Change, 15, 1215-1227. https://doi.org/10.1007/s10113-014-0674-0
[61]
Das, S., Muleba, M., Stevenson, J.C. and Norris, D.E. (2016) Habitat Partitioning of Malaria Vectors in Nchelenge District, Zambia. The American Journal of Tropical Medicine and Hygiene, 94, 1234-1244. https://doi.org/10.4269/ajtmh.15-0735
[62]
Stevenson, J.C., Pinchoff, J., Muleba, M., Lupiya, J., Chilusu, H., Mwelwa, I., et al. (2016) Spatio-Temporal Heterogeneity of Malaria Vectors in Northern Zambia: Implications for Vector Control. Parasites & Vectors, 9, 510. https://doi.org/10.1186/s13071-016-1786-9
[63]
CSO (2016) 2015 Living Conditions Monitoring Survey Report. Republic of Zambia. Central Statistical Office, Lusaka, Zambia.
[64]
IAPRI (2016) Rural Agricultural Livelihoods Survey. 2015 Survey Report. Indaba Agricultural Policy Research Institute, Lusaka, Zambia.
[65]
UNDP (2013) Millennium Development Goads (MDGs). Provincial Profile/Luapula Province/2013. United Nations Development Programme, Lusaka, Zambia.
[66]
Chidumayo, E.N. (2016) Classification of Forests in Zambia. Technical Report Series 2016. Technical Report No. 1, Lusaka, Zamiba.
[67]
Leadley, P., Pereira, H.M., Alkemade, R., Fernandez-Manjarrés, J.F. Proenca, V., et al. (2010) Biodiversity Scenarios: Projections of 21st Century Change in Biodiversity and Associated Ecosystem Services. Technical Series No. 50, Secretariat of the Convention on Biological Diversity, Montreal, 132 p.
[68]
Pohjonen, V.M. (2004) Zambia Forest Resource Assessment 2004. EU—Forestry Support Programme in Zambia—8 ACP/051, FRA Zambia 2004.
[69]
Puustjärvi, E., Mickels-Kokwe, G. and Chakanga, M. (2005) The Contribution of the Forest Sector to the National Economy and Poverty Reduction in Zambia. Forestry Department, Zambia and Ministry for Foreign Affairs of Finland, Lusaka, Zambia.
[70]
Vinya, R., Syampungani, S., Kasumu, E.C., Monde, C. and Kasubika, R. (2012) Preliminary Study on the Drivers of Deforestation and Potential for REDD+ in Zambia. A Consultancy Report Prepared for Forestry Department and FAO under the National UN-REDD+ Programme of Lands & Natural Resources, Lusaka, Zambia.
[71]
Syampungani, S., Chirwa, P.W., Akinnifesi, F.K., Sileshi, G. and Ajayi, O.C. (2009) The Miombo Woodlands at the Cross Roads: Potential Threats, Sustainable Livelihoods, Policy Gaps and Challenges. Natural Resources Forum, 33, 150-159. https://doi.org/10.1111/j.1477-8947.2009.01218.x
[72]
(2017) Report of the Auditor General on Sustainable Forest Management Republic of Zambia.
[73]
Lofgren, H., Harris, R.L. and Robinson, S. (2002) A Standard Computable General Equilibrium (CGE) Model in GAMS (Vol. 5). International Food Policy Research Institute.
[74]
Rutherford, T.F. (1995) Extension of GAMS for Complementarity Problems Arising in Applied Economic Analysis. Journal of Economic Dynamics and Control, 19, 1299-1324. https://doi.org/10.1016/0165-1889(94)00831-2
[75]
Bishop, P.M., Nicholson, C.F., Pratt, J.E. and Novakovic, A.M. (2001) Tariff-Rate Quotas: Difficult to Model or Plain Simple? Working Paper 2001/7, Institute of Economic and Research, New Zealand.
[76]
Böhringer, C. and Rutherford, T.F. (2005) Integrating Bottom-Up into Top-Down: A Mixed Complementarity Approach. ZEW, Centre for European Economic Research Discussion Paper No. 05-028. https://doi.org/10.2139/ssrn.770725
[77]
Carpenter, S.R., Cole, J.J., Pace, M.L., Batt, R., Brock, W.A., Cline, T., Coloso, J., Hodgson, J.R., Kitchell, J.F., Seekell, D.A., Smith, L. and Weidel, B. (2011) Early Warnings of Regime Shifts: A Whole-Ecosystem Experiment. Science, 332, 1079-1082. https://doi.org/10.1126/science.1203672
[78]
Dirkse, S.P. (1994) Robust Solution of Mixed Complementarity Problems. A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy, University of Wisconsin, Madison.
[79]
Brooke, A., Kendrick, D. and Meeraus, A. (1992) Release 2.25, GAMS, a User’s Guide. The Scientific Press, San Francisco.
[80]
Angelsen, A. (1999) Agricultural Expansion and Deforestation: Modelling the Impact of Population, Market Forces and Property Rights. Journal of Development Economics, 58, 185-218. https://doi.org/10.1016/S0304-3878(98)00108-4
[81]
Armington, P.A. (1969) A Theory of Demand for Products Distinguished by Place of Production. IMF Staff Papers, 16, 159-178. https://doi.org/10.2307/3866403
[82]
CSO (2016) National Accounts. Provincial Gross Domestic Product (GDP)—Charts. Industry Share to the GDP Ant Current Prices. Central Statistical Office, Republic of Zambia, Lusaka, Zambia.
[83]
Davies, J.B. (2009) Combining Microsimulation with CGE and Macro Modelling for Distributional Analysis in Developing and Transition Countries. International Journal of Microsimulation, 2, 49-65.
[84]
Layman, B. and Australia, W. (2004) CGE Modelling as a Tool for Evaluating Proposals for Project Assistance: A View from the Trenches. In: Fourth Biennial Regional Modelling Workshop in Melbourne: Policy Applications of Regional CGE Modelling, Melbourne, 1-25.
[85]
Peichl, A. (2016) Linking Microsimulation and CGE Models. International Journal of Microsimulation, 9, 167-174.
[86]
Colombo, G. (2010) Linking CGE and Microsimulation Models: A Comparison of Different Approaches. International Journal of Microsimulation, 3, 72-91.
[87]
Banda, O.O. (2013) Minimum Wage Policy and Domestic Workers in Zambia. Research Paper in Partial Fulfillment of the Requirements for Obtaining the Degree of Master of Arts in Development Studies, The Hague, The Netherlands.
[88]
Holt, D. and Littlewood, D. (2017) Waste Livelihoods amongst the Poor-Through the Lens of Bricolage. Business Strategy and the Environment, 26, 253-264. https://doi.org/10.1002/bse.1914
[89]
Gronau, S., Winter, E. and Grote, U. (2017) Modelling Nature-Based Tourism Impacts on Rural Development and Conservation in Sikunga Conservancy, Namibia. Development Southern Africa, 34, 276-294. https://doi.org/10.1080/0376835X.2016.1269638
[90]
Chidumayo, E.N., Timberlake, J. and Sawadogo, L. (2010) Distribution and Characteristics of African Dry Forests and Woodlands. In: Chidumayo, E.N. and Gumbo, D.J., Eds., The Dry Forests and Woodlands of Africa: Managing for Products and Services, Earthscan, London, UK, 11-41.
[91]
Bailis, R., Ezzati, M. and Kammen, D.M. (2005) Mortality and Greenhouse Gas Impacts of Biomass and Petroleum Energy Futures in Africa. Science, 308, 98-103. https://doi.org/10.1126/science.1106881
[92]
Thenya, T. (2006) Analysis of Macrophyte Biomass Productivity, Utilization and Its Impact on Various Eco-Types of Yala Swamp, Lake Victoria Basin, Kenya. In: Denich, M., Martius, C. and Rodgers, C., Eds., Ecology and Development Series No. 48, Cuvillier-Verlag, Göttingen, 207.
[93]
Klapwijk, C.J., van Wijk, M.T., Rosenstock, T.S., van Asten, P.J.A., Thornton, P.K. and Giller, K.E. (2014) Analysis of Trade-Offs in Agricultural Systems: Current Status and Way Forward. Current Opinion in Environmental Sustainability, 6, 110-115. https://doi.org/10.1016/j.cosust.2013.11.012
[94]
Röttgers, D. (2016) Conditional Cooperation, Context and Why Strong Rules Work—A Namibian Common-Pool Resource Experiment. Ecological Economics, 129, 21-31. https://doi.org/10.1016/j.ecolecon.2016.03.013
[95]
Peh, K.S.-H., Balmford, A., Bradbury, R.B., et al. (2013). TESSA: A Toolkit for Rapid Assessment of Ecosystem Services at Sites of Biodiversity Conservation Importance. Ecosystem Services, 5, 51-57. https://doi.org/10.1016/j.ecoser.2013.06.003
[96]
Kateyo, E., Nsereko, P. and Kansiime, F. (2014) Contribution of Wetland Resources to Household Incomes of Riparian Communities of Katonga Wetland in Mpigi District, Uganda. International Journal of Sciences: Basic Applied Research (IJSBAR), 13, 274-286.