Contribution of exclosures to woody species conservation and ecosystem restoration in degraded lands in Ethiopia

Abstract

Studies on the role of exclosures are fragmented and scattered, limiting a comprehensive understanding of their contributions to biodiversity conservation and ecosystem restoration. The objective of this review was to systematically evaluate the ecological and socio-economic impacts of exclosures in Ethiopia. Data for this review were systematically collected from 45 peer-reviewed literature, institutional reports, and field-based studies that examined the ecological and socio-economic impacts of exclosures in degraded lands. The review reveals that exclosures play a pivotal role in transforming degraded lands into productive and resilient habitats. Conversion of open grazing lands into exclosures markedly enhances woody species richness, often by 25–50%, while diversity indices reflecting species richness and evenness improve by 30–60%, indicating more balanced and stable plant communities. Exclosures promote natural regeneration, with seedling and sapling densities frequently 40–90% higher than in unprotected areas, ensuring sustainable population structures and long-term persistence of native woody species. Vegetation cover within exclosures can double compared to adjacent grazing lands, contributing to soil stabilization, reduced erosion, and microclimate regulation. Exclosure improves soil quality, nitrogen content, moisture retention, vegetation growth, carbon sequestration, and reduces land degradation. Exclosures also provide substantial socio-economic advantages by supplying communities with fuelwood, fodder, and other non-timber products, while restored ecosystems support livestock productivity and agricultural yields. The involvement of local communities in managing and protecting exclosures is critical to maximizing ecological and socio-economic outcomes. In conclusion, exclosures represent a highly effective, low-cost, and scalable strategy for restoring degraded lands, conserving biodiversity, improving soil properties, and supporting sustainable rural livelihoods. It is recommended that future restoration programs strengthen community participation and integrate exclosures with broader landscape management to enhance long-term ecological and socio-economic benefits.