Assessing the Impact of Agroforestry Practices on Climate Resilience and Yield Stability in Smallholder Coffee Systems in East Africa

Project Abstract

This study evaluates how agroforestry configurations influence climate resilience and yield stability in smallholder coffee systems across East Africa, with a focus on farmers’ livelihoods, biodiversity, and carbon sequestration. A mixed-methods approach combines quantitative field measurements, farmer surveys, and participatory on-farm trials implemented over three rainy seasons in Kenya, Uganda, and Tanzania. The experimental design compares coffee monocultures, shade-tolerant varieties intercropped with native leguminous and fruit trees, and modified shade structures with varying tree density, to quantify effects on microclimate, soil health, pest and disease incidence, and pollinator activity. Key climate resilience indicators include tolerance to drought, recovery after extreme weather events, and stability of yields under fluctuating rainfall. Yield stability is evaluated using temporal stability indices, coefficient of variation, and normalized difference vegetation index (NDVI) derived from remote sensing to capture vigor across years. Soil metrics encompass organic carbon, total nitrogen, cation exchange capacity, microbial biomass, and earthworm abundance to elucidate soil health improvements attributable to diversified canopy and litter inputs. The study also assesses carbon sequestration potential and its co-benefits for farm income through carbon credit pathways and reduced input costs. Socioeconomic analyses investigate farmers’ adoption barriers, labor and management requirements, and perceived risks and rewards of agroforestry systems. Data are analyzed through hierarchical mixed models to account for site-level heterogeneity, structural equation modeling to identify direct and indirect pathways linking agroforestry practices to resilience and yield outcomes, and value chain analyses to explore market access and pricing dynamics. Expected outcomes include evidence that well-designed shade-based systems enhance soil moisture retention, reduce evapotranspiration, and foster microbial activity, leading to lower yield volatility and higher resilience to drought and temperature stress. The incorporation of native and multipurpose tree species is anticipated to contribute to diversified income streams, improved biodiversity, and greater ecosystem services without compromising coffee productivity in sufficiently managed configurations. The study also aims to develop scalable guidelines for optimal shade density, tree-crop spatial arrangements, and species selection tailored to East African agroecologies, alongside decision-support tools for farmers and extension agents. By integrating agronomic performance with livelihoods and ecosystem services, the research intends to inform policy discussions on climate-smart cocoa and coffee farming, highlight gender-responsive adoption pathways, and contribute to sustainable intensification strategies that reconcile production objectives with conservation and climate mitigation goals. Ethical considerations include informed consent from participants, data anonymization, and equitable benefit sharing from potential carbon finance mechanisms.

Project Overview

What This Project Is About

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A plain-language overview of the topic and what the project investigates.

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The Problem It Addresses

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What problem or gap this project tackles and why it matters to the field or society.

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Objectives of the Project

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1. Identify how agroforestry practices influence climate resilience in coffee farming.
2. Evaluate effects on yield stability across multiple seasons and weather conditions.
3. Compare traditional and agroforestry-based systems in terms of inputs, costs, and outputs.
4. Provide practical recommendations for farmers and extension services.

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What You Will Do Step by Step

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1. Review basic literature on agroforestry, climate resilience, and coffee production.
2. Select study sites with varying agroforestry practices in East Africa.
3. Collect data on rainfall, shade levels, pest pressure, yields, and income.
4. Analyze how shade and intercrops relate to stability of yields over time.
5. Assess farmer perceptions and economic viability of practices.
6. Draft practical guidelines for implementing agroforestry in smallholder farms.

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Expected Outcome

1. Evidence showing whether agroforestry improves climate resilience and yield consistency.
2. Clear, farmer-friendly recommendations for best practices and management.