Forest composition and its regeneration dynamics; a case study of semi-decidous tropical forests in Kenya

Abstract

Distribution of the forest blocks carrying Brachylaena huillensis as a component species are shown. and details of species composition, structural and size.distribution of three of these; Karura, Muguga and Ngong in the central highlands were investigated. The procedures for the various investigations are given. Much of the remaining semi-deciduous forest patches in Kenya are characterized by open canopies mainly .as a result of selective cutting of the commercial emergent trees in the past. The stands are comprised of many families but of comparatively few species. Species composition and structure indicates poor correlation with other regional forests,suggesting the ifi1portance of conserving these forest patches. Size-structure analysis revealed that the forests are dynamic and component species including E. huillensis are significantly (P< 0·0 1) represented from seedling to large diameter stems. There were, however, fewer stems between 50 and SO em dbh than those above the 8Ocm dbh. This is a reflection of past selective cutting of better formed stems within this range. Stems above 8Ocm dbh are mainly poorly formed. E. huillensis is the most important, social and commercial species in these forests.To be able to direct its management in order to meet a balance between its exploitation and conservation, further studies 01'1 its reproductive and actual growth dynamics are recommended.