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2012

Sahel Atlas of Changing Landscapes : Tracing trends and variations in vegetation cover and soil condition. United Nations Environment Programme, Nairobi

Malta by Progress Press Ltd, Malta (United Nations Environment Program)

Titre : Sahel Atlas of Changing Landscapes : Tracing trends and variations in vegetation cover and soil condition. United Nations Environment Programme, Nairobi

Auteur(s) : Tor-Gunnar Vågen and Thomas Gumbricht
Editeur : Malta by Progress Press Ltd, Malta (United Nations Environment Program)
Date de parution : 2012
Pages : 102

Descriptif
This atlas aims to illustrate a rigorous scientific basis for understanding processes of landscape change in the Sahel and describes landscapes, climate, vegetation, and trends in vegetation and soil health. The atlas provides a pictorial overview of the application of land degradation surveillance – a science-based approach to land health monitoring and assessment. Systematic sampling and observation of ground conditions are combined with new technology for rapid soil characterization and with fine to moderate resolution satellite imagery to provide powerful inference about soil, vegetation and socioeconomic conditions at local to regional scales. Investments in regional application of this approach will provide a sound scientific basis for understanding and managing climate-vegetation-management processes and feedbacks in the Sahel and elsewhere.

Présentation
During the 1970s and 1980s the Sahel, a semi-arid savannah between the Sahara Desert and the Guinea moist savannah, experienced severe droughts. The droughts had devastating consequences for this ecologically vulnerable transition region. Since the mid 1980s, however, rainfall and vegetation has largely recovered. The driving forces of the climate variations and the droughts are not fully understood. The views range from those blaming human caused land degradation driven by overgrazing and deforestation as the underlying forces, to those emphasizing the global climate system driven by annual to decadal changes in seasurface temperatures. The future of the Sahel ecosystem and the livelihoods of the farmers and herders depend on both the climate, and the ecosystem services that can be sustained by the soil and vegetation. Knowledge about both soil and vegetation processes and future climate is needed in combating land degradation in the Sahel, and for proper planning of agricultural and economic development. This atlas aims to illustrate a rigorous scientific basis for understanding processes of landscape change in the Sahel.

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Page publiée le 22 novembre 2016, mise à jour le 10 juin 2018