TREE SPECIES DIVERSITY ANALYSIS OF KOGO FOREST RESERVE IN NORTH-WESTERN NIGERIA
Bello, A. G., A. D. Isah and B. Ahmad
|Corresponding Author: SHARMA VIVEK, E-mail: [email protected]|
|Received: 1 Mar-2013 Accepted: 9 June-2013|
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This research was carried out to determine the tree species composition, relative density and dominance, richness and evenness (diversity) of Kogo Forest Reserve in North-Western Nigeria. Eight sample plots (100m x 100m) were laid at random within the forest reserve, and tree species found were enumerated by point centered quarter (PCQ) method. A total of 249 tree stands were encountered in the reserve, belonging to twenty nine different tree species, distributed within 25 genera and into sixteen 16 families. Family Caesalpiniaceae had the highest number of six species in five genera, followed by Mimosaceae with four species belonging to four different genera. Families Anacardiaceae and Combretaceae had three species each while family moraceae had two species within a genus and all the other eleven 11 families had one species each. Species Annogeisus leiocarpus had the highest relative density and dominance of 24.49% and 23.23% respectively, followed by Isoberlinia doka with 18.07% and 13.14%, and the least was Annona senegalensis having 0.40% and 0.05% respectively. Shannon’s diversity index was 2.626, Species evenness (EH) 0.78, Species richness (d) 1.84 and Shannon’s maximum diversity (Hmax) was 3.37. Kogo had a moderate diversity and hence closure of the forest for exploitation to allow the forest to fully regenerate and enhance the fertility of the soil is therefore recommended.