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Farming systems, with their concerns of biodiversity, ecosystem services, and productivity and production issues towards progress in human needs, wellbeing, and sustainable development, are challenging in most biosphere reserves. In this study, we assess the levels and trends of the agro-biodiversity and ecosystem services of different farming systems in the Yayo Biosphere Reserve in Ethiopia. Interviews with a total of 120 farmers, 16 key informants, and 12 focal group discussions (FDGs) were conducted, and species composition was assessed based on data collected on ten plots per major farming system. Result indicate that four farming systems, namely homegardens (HG), plantation coffee (PC), semi-forest coffee (SFC), and annual crop production (CP) systems, can be identified. Shannon and Evenness indices were highest in the HG system (H′ = 3.14, E = 0.8), and lowest in the CP system (H′ = 0.71, E = 0.18). Additionally, more diversified and relatively less cultivated farming systems provide more ecosystem services, and land users tend to practice less diversified farming systems in order to increase food supply at the expense of other ecosystem services. Therefore, this study recommends that diversified farming systems need to be considered to conserve or enhance specific ecosystem services in ways that reduce their negative tradeoffs.

Agricultural Biodiversity and Ecosystem Services of Major Farming Systems: A Case Study in Yayo Coffee Forest Biosphere Reserve, Southwestern Ethiopia