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Conservation Of Tree Species Diversity In Tropical Rainforest Ecosystem Of South-West Nigeria

Adekunle, V.A.J., (2006) Conservation Of Tree Species Diversity In Tropical Rainforest Ecosystem Of South-West Nigeria. Journal of Tropical Forest Science, 18 (2). pp. 91-101. ISSN 0128-1283

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Federal University of Technology, Department of Forestry and Wood Technology, Akure, Nigeria


Three reserves, each of size 50 × 50 m, were selected in the ecological zone comprising eight sampling plots. Identification and distribution into families of all woody plants with diameter at breast height (dbh) > 10 cm were carried out. Frequency distribution per ha of each species and relative diversity were determined. A total of 54 different tree species (24 families) were identified in Ala, 41 species (21 families) in Omo and 55 species (20 families) in Shasha Forest Reserves. The most prevalent species in the ecosystem was Strombosia pustulata, while the family Leguminosae had the highest number of species. Eightyfour percent of the species are regarded as rare or threatened with extinction while 16% were relatively
abundant. The highest species diversity indices were obtained in Shasha Forest Reserve (3.656 and 0.914,
Shannon and evenness indices respectively), the lowest in Omo Forest Reserve (3.342 and 0.900 respectively).
There was no significant difference in the number of individual ha–1 on species basis, the relative density of
species and also in the distribution of species into families (p > 0.05). Fifty percent of the species could be
regarded as habitat generalists as they occurred in the three reserves. The contribution of the ecosystem to
rural livelihood in the supply of some products and in environmental conservation and the need for urgent
conservation efforts are highlighted.

Tiga hutan simpan, setiap satunya berkeluasan 50 m × 50 m, dipilih di zon ekologi yang mengandungi lapan plot sampel. Semua tumbuhan berkayu yang berdiameter aras dada (dbh) > 10 cm dikenal pasti dan dikelaskan mengikut famili. Sebanyak 54 spesies pokok berbeza (24 famili) di kenal pasti di Hutan Simpan Ala, 41 spesies (21 famili) di Hutan Simpan Omo dan 55 spesies (20 famili) di Hutan Simpan
Shasha. Spesies yang paling luas taburannya ialah Strombosia pustulata sementara famili Leguminosae
mempunyai bilangan spesies yang tertinggi. Sebanyak 84% spesies dianggap sebagai spesies nadir atau terancam
oleh kepupusan sementara 16% spesies mempunyai bilangan yang agak tinggi. Indeks kepelbagaian spesies
yang paling tinggi didapati di Hutan Simpan Shasha (indeks Shannon 3.656, indeks malar 0.914) sementara
yang paling rendah adalah di Hutan Simpan Omo (indeks Shannon 3.342, indeks malar 0.900). Tidak terdapat
perbezaan ketara dalam jumlah individu per hektar (p > 0.05) dari segi spesies, ketumpatan relatif spesies
dan juga taburan spesies mengikut famili. Lima puluh peratus spesies boleh dianggap sebagai juruam habitat
kerana spesies-spesies tersebut wujud dalam ketiga-tiga hutan simpan. Turut dibincangkan dalam kertas kerja
ini ialah sumbangan ekosistem terhadap mata pencarian penduduk luar bandar dari segi bekalan sesetengah
produk dan juga dari segi pemuliharaan alam sekitar serta keperluan usaha pemuliharaan yang segera.

Item Type:Journal
Keywords:Relative density, vegetation, herbs, rural livelihood, forest reserve, sampling
Subjects:S Agriculture, Forestry
ID Code:9090

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