Tree vegetation patterns along a gradient of human disturbance in the Sahelian area of Mali

Dembélé Fadiala, Picard Nicolas, Karembé Moussa, Birnbaum Philippe. 2006. Tree vegetation patterns along a gradient of human disturbance in the Sahelian area of Mali. Journal of Arid Environments, 64 (2) : 284-297.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Géographie-Aménagement-Urbanisme-Architecture

Résumé : This study characterizes the tree vegetation around Bamba, a village adjacent to the northern part of the river Niger in Mali. Tree species are surveyed in an area of 1300 km2. Two human activities in this area affect tree distribution: herd grazing and fuel-wood logging. The characteristics of this tree vegetation are related to the spatial distribution of villages, wells and the river Niger. Two tree vegetation gradients are identified: a North-South gradient in terms of tree density and logging intensity, and a radial gradient around wells in terms of regeneration. Species composition is similar throughout the entire area. Tree density and logging intensity increase from North to South. This gradient may be explained by the amount of ground-water due to the river Niger and by the distance to villages. Seedling density increases with distance from wells. This gradient may be related to herd trampling. Both gradients are non-linear: a threshold distance of 4 km is associated with the North-South gradient, whereas that for the radial gradient is 9 km.

Mots-clés Agrovoc : écologie, Acacia tortilis, bois de chauffage

Mots-clés géographiques Agrovoc : Mali

Classification Agris : F40 - Écologie végétale
P01 - Conservation de la nature et ressources foncières

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Dembélé Fadiala, IPR (MLI)
• Picard Nicolas, CIRAD-FORET-UPR Dynamique forestière (FRA)
• Karembé Moussa, IER (MLI)
• Birnbaum Philippe, CIRAD-FORET-UPR Ressources forestières (MLI)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/532019/)

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