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 Printable version |
Assessment of the declining state of four woody species populations in the Sudanian part of Burkina Faso |
Science et changements planétaires / Sécheresse. Volume 17, Number 4, 485-91, Octobre-Novembre-Décembre 2006, Article scientifique
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 Résumé
Article gratuit
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Author(s) : Amadé Ouédraogo, Adjima Thiombiano, Karen Hahn-Hadjali, Sita Guinko |
Summary : Climatic aridity and anthropic pressure are mainly responsible for the decline of many woody species in Sudanian areas. Afzelia africana, Bombax costatum, Boswellia dalzielii, and Pterocarpus erinaceus are high-value but threatened species in Eastern Burkina Faso. This study assesses the state they are in based on the analysis of diameter classes and on field surveys of their natural unattended regeneration in permanent stands. The four species populations showed a strong declining dynamics characterized by aging trees and some regeneration difficulties in the establishment as well as in the development of saplings. Regeneration by root suckers and lignotubers is observed respectively for B. costatum and B. dalzielii on the one hand, and for A. africana and P. erinaceus, on the other hand. For these species, the slow growth of saplings is the main obstacle to their regeneration in a disturbed semiarid area. |
Keywords : aridity, Burkina Faso, degradation, forestry, regeneration, woody species |
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