Forest structure analysis of Akopi Forest in Benue State, Nigeria

Abstract

This study analyzed the structure of Akopi forest to facilitate its sustainable management. Data was collected from seven 0.25 ha sample plots in the  forest stand using the systematic line plot sampling design. All trees in the sample plots with stem diameter at breast height of ≥ 5 cm were identified and measurements taken for stand structural attributes which include tree stem diameter at breast height (DBH), total tree height (THT), tree crown diameter (CD) and tree crown height (CH). Forest structure was analyzed based on tree density (tress/ha), size class distributions and diversity indices (Shanon-Weiner index, Pielou evenness idex and mean structural diversity index). The results of the analysis produced low Shanon-Weiner index values (1.185 to 1.521) for all the structural attributes indicating low structural diversity. Pielou evenness (0.661 to 0.761) for all structural attributes and the Mean structural diversity (1.354) for the forest stand also revealed low structural diversity. The results of this study suggest Akopi forest is undergoing deforestation. Sustainable management measures that will enhance structural diversity should be considered  and implemented.

Keywords: structural diversity, diversity indices, forest structure, tree size distribution, forest density.