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Resumo

Desertification poses significant environmental and socio-economic threats to pastoral systems within the drylands of sub-Saharan Africa. However, there remains a paucity of interdisciplinary studies delving into the anthropogenic drivers of desertification at the local level of social-ecological systems, resulting in an inadequate understanding of its human-induced causes. This research aims to bridge this gap by presenting three case studies from Namibia's eastern communal areas. Through an integrated approach drawing from rangeland ecology and anthropology, we offer a comparative analysis revealing nuanced differences among individual pastoral settlements, shaped by their distinct social contexts. Our findings elucidate the social determinants influencing varying degrees of desertification at the village level, highlighting local factors that mitigate the adverse impacts of grazing pressure and aridity on perennial grass populations. Notably, the study identifies the role of social institutions in managing critical environmental conditions and physical infrastructures, such as extensive pastures and cattle posts, which contribute to maintaining grassland resilience. Despite observable signs of desertification, the presence of perennial grasses both aboveground and in the soil seed bank across all settlements suggests that a tipping point has not yet been reached, emphasizing the window of opportunity for intervention. The discussion extends to the potential transferability of these findings to other Namibian communities within the existing socio-ecological framework, aiming to avert impending tipping points. Ultimately, the study challenges the notion of desertification in pastoral social-ecological systems as solely a tragedy of the commons, emphasizing the imperative of developing and implementing suitable social institutions within colonial and post-colonial contexts.

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