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DENDROMETRIC STUDY OF Pterocarpus erinaceus POIR IN THE NATURAL STANDS OF SUDANIAN ZONE OF BENIN Pterocarpus erinaceus is an arborescent deciduous legume tree of African savannas and dry forests growing in natural stands in the sudanian zone in Benin. An inventory of trees in the P. erinaceus dominated communities was carried out in order to describe their structure in tree-savannah and woodland, on the basis of some dendrometric parameters such as the diameter, the height, the basal area, the bark factor etc. The measurements have been done in 400 circular plots of 15 m of radius, in Oueme Superieur and Wari-Maro forest reserves. The results showed that the tree-density of the stands was higher in tree-savannas than in the woodlands whereas the mean height and the mean diameter of P. erinaceus trees and of the whole stands obtained their highest values in woodlands. Furthermore, the two targeted forest reserves (Oueme superieur and Wari-Maro) have similar values for the dendrometric parameters. The diameter structure of P. erinaceus revealed the abundance of trees with mean diameter whereas trees with small or high diameter were scarce. The overall stand has an «i-shaped» structure, showing an uneven-aged and mixed species nature of the stands. Moreover, the height-diameter relationship of P. erinaceus was logarithmic with a R-square value of 37 % and 16 % in tree-savanna and woodland, respectively.

Etude dendrometrique de <i>Pterocarpus erinaceus</i> poir. des formations naturelles de la zone soudanienne au Benin