Structural and spatial patterns of Isoberlinia species in a disturbed community forest (Benin, West Africa)

Abstract

Aim of study: This study focused on the analysis of structural and spatial patterns of Isoberlinia spp stands according to topographic units. Area of study: Data collection were carried out within the Zouzounkan forest reserve, located in Southern Benin. Material and Methods: Square plots of 1 ha were considered for the forest inventory in which, geographical coordinates of Isoberlinia individuals were recorded. Ripley’s K function was used to assess the spatial patterns of the species in the forest whereas dendrometric and ecological parameters was computed to analyze the structure of the species populations. Possible impact of topographic units of the forest reserve on dendrometric and spatial patterns of trees was assessed. Main results: The results show that Isoberlinia spp. is more abundant on the hill side than on the top and down hills. Aggregative spatial distribution of trees was found across topographic units with more aggregation on the hill side. However beyond a radius of 8 m aggregation decreased. Furthermore, significant difference was noted on dendrometric patterns of Isoberlinia trees according to topographic unit. Research highlights: Results obtained suggest that effective conservation strategy of Isoberlinia trees in Zouzoukan forest reserve should take into account topographical patterns.