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

作　　者：Lorenz Huebner Ayad M. Fadhil Al-Quraishi Oliver Branch Heman A. A. Gaznayee Lorenz Huebner;Ayad M. Fadhil Al-Quraishi;Oliver Branch;Heman A. A. Gaznayee(Flensburg, Germany;Petroleum and Mining Engineering Department, Faculty of Engineering, Tishk International University, Erbil, Kurdistan Region, Iraq;Institute of Physics and Meteorology, University of Hohenheim, Stuttgart, Germany;Department of Forestry, College of Agricultural Engineering Sciences, Salahaddin University, Erbil, Kurdistan Region, Iraq)

机构地区：[1]Flensburg, Germany [2]Petroleum and Mining Engineering Department, Faculty of Engineering, Tishk International University, Erbil, Kurdistan Region, Iraq [3]Institute of Physics and Meteorology, University of Hohenheim, Stuttgart, Germany [4]Department of Forestry, College of Agricultural Engineering Sciences, Salahaddin University, Erbil, Kurdistan Region, Iraq

出　　处：《Journal of Geoscience and Environment Protection》2022年第2期94-108,共15页地球科学和环境保护期刊（英文）

摘　　要：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 afforestation measures underlying three simulation studies, together with a restoration model in which compartments are formed by greenbelts to enable succession of savanna vegetation, protected from hot wind and drought. Savanna-like vegetation (around 20% woody plants) will show bright reflective surface 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 protected succession of diverse, climatically adaptable vegetation could also be used in populated drylands, as a sustainable and temperature balancing solution to desertification.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 afforestation measures underlying three simulation studies, together with a restoration model in which compartments are formed by greenbelts to enable succession of savanna vegetation, protected from hot wind and drought. Savanna-like vegetation (around 20% woody plants) will show bright reflective surface 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 protected succession of diverse, climatically adaptable vegetation could also be used in populated drylands, as a sustainable and temperature balancing solution to desertification.

关 键 词：Extreme Heat Vegetational Compartments Natural Succession Dryland Restoration Savanna Vegetation Sahel Climate Simulation 

分 类 号：P46[天文地球—大气科学及气象学]