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Evolution spatiale de la savane arborée sahélienne, de ses usages et de sa gestion, face aux changements environnementaux

Abstract : Using remote sensing, geomatics and field surveys, we confirmed the existence of Sahelian regreening during the period 1981 to 2006, even though it is far from homogeneous. These spatial differences can not be explained solely by natural factors. Population growth alone does not explain these differences across the Sahel. The multiscale approach to changes in plant cover over more than 50 years, in the six workshops belonging to three different countries, shows that the increasing presence of man does not systematically cause the disappearance of trees. The observed agricultural expansion seems to have led to the "displacement" of trees from the savannah to the cultivated areas and villages, the rural Sahelian societies shaping tree cover according to their needs (agriculture, clearing, cutting, energy wood). The analysis of the speeches of the people we met showed that the involvement of local "facilitators" is essential to the success of replanting projects and safeguarding the forest heritage of each village. The use of geo-textometric analyzes of the discourse made it possible to highlight the opposition "Users-Managers" but also the differences between sites along the north-south bioclimatic gradient. Nevertheless, future generations have a representation of their environment that could go hand in hand with a concern for its preservation
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  • HAL Id : tel-02344448, version 1

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Benoît Toulouse. Evolution spatiale de la savane arborée sahélienne, de ses usages et de sa gestion, face aux changements environnementaux. Géographie. Université Sorbonne Paris Cité, 2018. Français. ⟨NNT : 2018USPCC114⟩. ⟨tel-02344448⟩

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