Determination of phytosociological characteristic, biodiversity conservation dynamics and biomass potentials in a Nigerian protected forest

Aladesanmi Daniel AGBELADE ； Ifeoluwa Grace AKOMOLAFE ； Gboyega Emmanuel OJERINDE

《TAIWANIA》 67卷4期 (2022/12) Pp. 576-586

https://doi.org/10.6165/tai.2022.67.576

摘要

Tropical rainforest contributes immensely to the richness, diversity and productivity of ecosystem. This study aimed to determine the structure, biodiversity and carbon stocks of Okomu protected forest in Nigeria. Simple random technique was adopted in selection of 9 compartments and in each compartment 4 plots of size was selected with 36 plots of (25 m x 25 m x 36 plots), making a total of 2.25 ha selected from the entire forest. Shannon-Wiener diversity index, Shannon's equitability of species evenness, Margalef's index of species richness and volume equations were used to determine species diversity, evenness, richness and tree structure respectively. There were 790 individual trees, 351 stems ha^(-1) belonging to 67 tropical hardwood species, 86 genera and 31 families. About 24% of tree species in this protected forest were among tree species that needs urgent conservation measures. The total volume was estimated to be from 1970.40 to 9437.76 m^3 with an average of 4643.20 m^3 ha^(-1), an indication of vertical and horizontal structure confirm the growing natural of this protected forest. Accumulation of total biomass was estimated to be from 1150.72 to 6795.20 kg ha^(-1) with an average of 2927.72 kg ha^(-1). The carbon stock in this protected forest was estimated to be from 575.36 to 3397.60 kg ha^(-1) with an average of 1463.88 kg ha^(-1). The forest serves as biodiversity hotspot due to high Shannon-Wiener index and evenness computed for the compartments. This serves as information for management of protected forests, with potentials for nature conservation and carbon sequestration.

關鍵字

Biodiversity ； conservation ； Celtis zenkeri ； ecosystem services ； in-situ ； national park ； protected forest

參考文獻

Adalarsan, R., S. Mani, V. Karikalan and S. Manivasakan 2007. Carbon sequestration: Estimation of carbon stock in teak (Tectona grandis Linn. F.) ecosystem. In: Proceedings of the 12th International Forestry and Environment Symposium, 2007, Kalutara. Published by Department of Forestry and Environmental Science, University of Jayewardenepura, Nugegode, Sri Lanka 20th November – 1st December 20–24 pp.

Adekunle, V.A.J., N.K. Nair, A.K. Srivastava and N.K. Singh 2014. Volume yield, tree species diversity and carbon hoard in protected areas of two developing countries. Forest Sci. Technol. 10(2): 89–103.

Agbelade, A.D. and J.C. Onyekwelu 2020. Tree species diversity, volume yield, biomass and carbon sequestration in urban forests in two Nigerian cities. Urban Ecosyst. 23(5): 957–970.

Alves, L.F., A. Vieir, M.A. Scaranello, P.B. Camargo, F.A.M. Santos, C.A. Joly and L.A. Martinelli 2010. Forest structure and live aboveground biomass variation elevational gradient tropical Atlantic moist forest (Brazil). For. Ecol. Manag. 260(5): 679–691.

Ambagahaduwa, I.M., N. Prasad, I.A.U.N. Gunatilleke, G. Seneviratne and C.V.S. Gunatilleke 2009. Estimation of above ground biomass of a Pinus caribaea Morelet stand in lower Hantana. J. Nat. Sci. Foundation Sri Lanka 37(3): 195–201.