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L’objectif de cette etude etait de determiner l’influence des activites anthropiques incontrolees ainsi que du type de vegetation sur la structure des peuplements de Isoberlinia spp.. Les donnees ont ete collectees dans 43 placeaux installes dans les forets claires et les savanes arborees/boisees situees dans la foret classee et hors foret classee. Les parametres consideres ont ete le diametre, la hauteur, la densite, la surface terriere et la valeur d’importance ecologique. Le test non-parametrique de Kruskal-Wallis et la distribution de Weibull ont permis respectivement de comparer les moyennes et d’apprecier la dynamique. Dans la foret classee, les valeurs moyennes du diametre, de la hauteur et de la surface terriere etaient plus elevees et differaient (p 0,05) entre les deux entites. La densite de regeneration est importante, mais peu s’affranchissent. Suivant le type de formation vegetale, les forets claires sont dominees par des individus de gros diametres et de grande taille. La structure de Isoberlinia spp . presente une allure en cloche avec le parametre de weibull c = 2,32, traduisant une distribution asymetrique positive avec une predominance d’individus de gros diametre. Les peuplements de Isoberlinia spp . sont mieux conserves dans la foret classee, notamment dans les forets claires. Cependant, la faible capacite de l’espece a assurer la succession des classes menace la survie de ces peuplements. La prise de mesures de gestion appropriees alors s’impose. © 2019 International Formulae Group. All rights reserved Mots cles: Degradation, peuplements, structure, foret classee de Koulbi, forets claires English Title: Effects of anthropogenic pressure on stands of Isoberlinia doka Craib and Stapf and Isoberlinia tomentosa (Harms) Craib and Stapf in the Sudanian zone of Burkina Faso English Abstract The objective of this study was to determine the influence of uncontrolled human activities and vegetation type on the stand structure of Isoberlinia spp . Data were collected in 43 plots installed in woodland, tree and wood savannah stands located inside the protected and unprotected areas. Parameters considered were  stem diameter, tree height, stand density, basal area and importance value index. The non-parametric Kruskal-Wallis test was used to compare averages. The Weibull distribution was used to assess the structure dynamic of stands inside and outside the protected area. In the protected area, the mean values of diameter, height and basal area were significantly higher (p 0.05) between the groups. The density of the regeneration is quite important. But most of them (75%) remain in the height class] 0 to 0.5 m]. According to vegetation types, woodland are dominated by large individuals. The structure of Isoberlinia spp . has a bell shaped curve with the weibull parameter c = 2.32, reflecting a positive asymmetric distribution with a predominance of large diameter individuals. The stands of Isoberlinia spp . are better conserved in the classified forest, especially in open forests. The low regeneration capacity threatens the survival of these stands in the long term. So better management measures are therefore needed to halt the degradation process. © 2019 International Formulae Group. All rights reserved Keywords: Degradation stands structure, classified forest of Koulbi, woodland

international journal of biological and chemical sciences

Pression anthropique et dynamique des peuplements de &lt;i&gt;Isoberlinia doka&lt;/i&gt; Craib et Stapf et &lt;i&gt;Isoberlinia tomentosa&lt;/i&gt; (Harms) Craib et Stapf dans le domaine soudanien du Burkina Faso