Sahel Afforestation and Simulated Risks of Heatwaves and Flooding Versus Ecological Revegetation That Combines Planting and Succession

M. Fadhil Al-Quraishi, Ayad (2022) Sahel Afforestation and Simulated Risks of Heatwaves and Flooding Versus Ecological Revegetation That Combines Planting and Succession. Journal of Geoscience and Environment Protection, 10 (2).

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Abstract

Studies simulating the large-scale afforestation of the African Sahel constantly find warning signals of increased risk of extreme temperatures and heatwaves resulting from changes in albedo and latent heat flow. We review the affore�station measures underlying three simulation studies, together with a restora�tion model in which compartments are formed by greenbelts to enable suc�cession of savanna vegetation, protected from hot wind and drought. Savan�na-like vegetation (around 20% woody plants) will show bright reflective sur�face and drying of leaves during dry season rather than constant green color, with very different impact on albedo and temperatures. We derive that the simulated risks of extreme heat and flooding from rain will strongly depend on species, shape and density of the new vegetation. Ecological restoration concepts are expected to mitigate or prevent such restoration related climatic risks. Compact afforestation of the Sahel does not appear to be necessary or feasible. A restoration model based on compartmentalization and the pro�tected succession of diverse, climatically adaptable vegetation could also be used in populated drylands, as a sustainable and temperature balancing solu�tion to desertification

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