Global Journal of Science Frontier Research, H: Environment & Earth Science, Volume 23 Issue 1

= = ∑ ln( ) =1 ln⁡( ) …………… . (3) III. D ata A nalyses The data collected were subjected to appropriate descriptive analysis for tree species diversity and richness and the abundance under the different physiognomy, and subjected to analysis of variance (ANOVA). IV. R esults The results of the tree relative density showed that 9 (39.91%) of the local tree species observed were the predominant onespresent during the study (Table 1). Six hundred and forty-four (644) individual tree stands, belonging to 60 species and 24 families of the trees were recorded. Rauvolfia vomitoria of the family Apocynaceae (46) mainly predominated tree species, followed by Celtiszenkeriof the family Ulmaceae (32), and the families with the highest number of species were Sterculiaceae (8), Euphorbiaceae (7), and Ebenaceae (6) (Table 1). The tree species diversity indices obtained showed that Shannon-Weiner diversity and species evenness were (3.855and 0.596), respectively. Rauvolfia vomitoria of Apocynaceae family had the highest Shannon–Weiner (0.189, 0.029) and Diospyrosmon buttensis, Diospyros canaluculata of Ebenaceae family, Memecylon afzeliiof Melastomata- ceae family, and Oxyanthus specious of Rubiaceae had the lowest Shannon–Weiner respectively (0.010, 0.002). Table 1: Family Distribution of Genera, and Species in Shasha Forest Reserve in both Seasons Family Name Species Names No of Genera No of Species Total No of Species Annonaceae Clestopholis patens (Benth.) Engl. and Diels 1 1 6 Enantiachlorantha Oliv . 1 1 3 Xylopiaaethipica (Dunal) A.Rich 1 1 3 Apocynaceae Alstonia boonei DeWild . 1 1 10 Funtumiaelastica (Preuss) stapf 1 1 19 Holarrhena floribunda (G.Don) T. Durang&Schinz 1 1 5 Pricalima nitida (Stapf) T Durand &H.Durand 1 1 30 Rauvolfia vomitoria Afzel . 1 1 46 Bignoniaceae Mikhamia sp 1 1 7 Spathodeacampanulata P. Beauv . 1 1 13 Caesalpiniodeae Danieliogea (Harms) Rolfe ex Holland 1 1 10 Capparaceae Buchholziacoriacea Engl. 1 1 18 Combretaceae Terminalia ivorensis Chev . 1 2 21 Terminalia superb Engl. & Diels (Limba) Ebenaceae Diospyrosbarterii Hiern 1 6 78 Diospyros canaluculata De Wild Diospyrosdendo Welw.exHiern Diospyrosmonbuttensis Gurke Diospyrossuaveolens Gurke Diospyroscanaliculata De Wild Euphorbiaceae Drypeteschevellerii Beille 1 4 40 Drypetes floribunda (Muell.Arg) Hutch. Drypetespaxii Hutch . Drypetesprincipum (Muell.Arg) Hutch Macaranga barteri M ū ll-Arg 1 1 19 Ricinodendronafricanum (Ball.) Pierre 1 2 5 Ricinodendronheudelotii (Ball.) Pierre Malvaceae Nesogordoniapapaverifera (A.Chev.) R.Capuron 1 1 6 Melastomatacae Memecylon afzelii G . Don 1 1 1 Meliaceae Entandrophragmaangolense (welw.) C. DC 1 1 5 Guareacedrata (A.Chev.) pellegrin 1 1 5 Tree Species Diversity Status and Contributors to Forest Degradation in Shasha Forest Reserve, Nigeria 1 Year 2023 39 © 2023 Global Journals Global Journal of Science Frontier Research Volume XXIII Issue ersion I VI ( H )