turk. j. biod. Turkish Journal of Biodiversity 2667-4386 Artvin Çoruh University 10.38059/biodiversity.889433 Diversity and abundance of tree species of a protected woodland: Southern Guinea savanna zone (Nigeria) Korunan bir ormanlık alanın ağaç türlerinin çeşitliliği ve bolluğu: Güney Gine savan bölgesi (Nijerya) https://orcid.org/0000-0003-3756-8153 Adenıjı Oluwafemi Federal College of Wildlife Management, NewBussa, Niger State, Nigeria https://orcid.org/0000-0003-1518-5952 İrunokhai Eric Federal College of Wildlife Management, New Bussa, Niger State https://orcid.org/0000-0002-6624-3465 Adigun Joseph Federal College of Wildlife Management, New Bussa, Niger State https://orcid.org/0000-0002-7038-7808 Olorunfemi Sunday Federal University of Technology, Akure, Nigeria 09 30 2021 4 2 69 76 03 02 2021 09 22 2021 Copyright © 2018, Turkish Journal of Biodiversity 2018 Turkish Journal of Biodiversity

The study was carried out to assess the diversity and abundance of tree species in Federal College ofWildlife Management, New Bussa, Niger State. Twelve rectangular sample plots of 50x50m (3hectares) were inventoried in the woodland. 273 trees per hectare were recorded, which belongedto 41 species and 18 families. Anogeissus leiocarpus was the most abundant tree species in thestudy area. The total basal area was 11.42m2 per hectare. Sterculia setigera had the highest meandiameter at breast height at 51.29 cm while the highest mean height of 14.87 m was recorded forDaniellia oliveri. Shannon-Weiner diversity index (H) value was 3.14. Maximum diversity index(Hmax) was estimated to be 5.61, Pielou’s species evenness index (EH) was 0.56 and Margalef’sindex of species richness (M) was calculated to be 7.13. There is need to ensure continuousavailability of trees in the study area through effective conservation programme.

Bu çalışma, Nijer Eyaleti, New Bussa, Federal Yaban Hayatı Yönetimi Koleji'ndeki ağaç türlerininçeşitliliğini ve bolluğunu değerlendirmek için yapılmıştır. Ormanlık alanda 50x50m (3 hektar)boyutunda on iki dikdörtgen örnek parselin envanteri çıkarılmıştır. Hektar başına, 18 familya ait 41türe ilişkin 273 ağaç kaydedilmiştir. Anogeissus leiocarpus, çalışma alanında en bol bulunan ağaçtürüdür. Toplam taban alanı hektar başına 11.42m2 olarak hesaplanmıştır. Sterculia setigera; 51.29cm ile en yüksek ortalama göğüs çapına sahip iken, en yüksek ortalama boy 14.87 m ile Danielliaoliveri için kaydedilmiştir. Shannon-Weiner çeşitlilik indeksi (H) değeri 3.14 olarak hesaplandı.Maksimum çeşitlilik indeksi (Hmax) 5.61, Pielou tür düzgünlük indeksi (EH) 0.56 ve Margalef tür zenginliği indeksi (M) 7.13 olarak hesaplanmıştır. Etkili koruma programları ile çalışma alanındakiağaçların sürekli mevcudiyetinin sağlanmasına ihtiyaç vardır.

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