Role of Biodiversity in Enhancing Sustainable Agricultural Ecosystems

Abstract

The intensification of monocultural agriculture has caused numerous environmental issues, including loss of soil fertility, pests, greenhouse gas emissions, and climate change. We quantify the role of biodiversity in sustainable agriculture using a problem-based research framework combining 87 field experiments from the tropics, temperate, and Mediterranean climates. We used mixed-effect modeling and field trials to compare biodiversity-rich systems (intercropping, crop rotation, cover cropping, and agroforestry) with monocultures in nine performance indicators. We demonstrate that biodiversity integration improves food security, soil health, pest management, and nutrient cycling. Water regulation (infiltration) improved by 274%, and greenhouse gases (global warming potential) decreased by 68.9%. Farmers' economic gains were 143% in net present value (NPV) and 170% in return on investment (ROI). Climate adaptation indicators showed a 225% increase in adaptation capacity index and a 75% reduction in yield loss due to extreme temperatures. Indicators of functional biodiversity showed increases in food web complexity (ecosystem multifunctionality index from 0.28 to 0.84). We conclude biodiversity enhancement measures are vital to make food systems productive, profitable, and resilient to climate change. Our findings provide guidance to policymakers and farmers to move from monocultures to diverse, agroecological farming systems.