Research Paper

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

Aladesanmi Daniel Agbelade, Ifeoluwa Grace Akomolafe, Gboyega Emmanuel Ojerinde

Published on: 06 November 2022

Page: 576 - 586

DOI: 10.6165/tai.2022.67.576

Abstract

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 m3 with an average of 4643.20 m3 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.

Keyword: Biodiversity, conservation, Celtis zenkeri, ecosystem services, in-situ, national park, protected forest

Literature

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.
DOI: 10.31357/fesympo.v12i0.538View Article Google Scholar

Adekunle, V.A.J. 2006. Conservation of tree species diversity in tropical rainforest ecosystem of Southwest Nigeria. J. Trop. For. Sci. 18(2): 91–101.

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.
DOI: 10.1080/21580103.2013.860050View Article Google Scholar

Adekunle, V.A.J., O.O. Adewole and O.A. Shadrach 2013. Tree species diversity and structure of a Nigerian Strict Nature Reserve. Trop. Ecol. 54(3): 275–289.

Agbelade, A.D. and B.H. Ojo 2020. Species diversity, volume determination and structure of protected forests for in-situ biodiversity conservation. Int. J. Conserv. Sci. 11(1): 133–144.

Agbelade, A.D. and D.O. Adeagbo 2020. Relationship between aboveground biomass and tree species diversity in two protected forests. Journal of Forestry Research and Management 17(1): 13–25.

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.
DOI: 10.1007/s11252-020-00994-4View Article Google Scholar

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.
DOI: 10.1016/j.foreco.2010.05.023View Article Google Scholar

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.
DOI: 10.4038/jnsfsr.v37i3.1213View Article Google Scholar

Brown, S. and A.E. Lugo 1992. Above ground biomass estimates for tropical moist forests of the Brazilia Amazo. Interciencia 17: 8–18.

Chandrashekara, U.M., and S. Sankar 1998. Ecology and management of sacred groves IKeralan, India. For. Ecol. Manag. 112(1-2): 165–177.
DOI: 10.1016/S0378-1127(98)00326-0View Article Google Scholar

Chave, J., C. Andalo, S. Brown, M. Cairns, J.C. Chambers, D. Eamus, H. Folster, F. Fromard, N. Higuchi, T. Kira, J. Lescure, B.W. Nelson, H. Ogawa, H. Piug, B. Reira and T. Yamakura 2005. Tree Allometry and improved estimation of carbon stock and balance in tropical forests. Oecologia 145(1): 87–99.
DOI: 10.1007/s00442-005-0100-xView Article Google Scholar

Ekanayake, S.P., R.H.S.S. Fernando and C.N.B. Bambaradeniya 2012. Baseline Assessment of Sequestered Standing Carbon Mahausakand Regenerating Rainforest. Mahausakande Tropical Rainforest Regeneration Initiative, 2: 32 pp.

FORMECU 1999. Forest Resources Study, Nigeria. Revised National Report Volume 2. Prepared for FORMECU by Beak and Geomatics International, Ibadan.

Husch, B., T.W. Beers and J.A. Keenshaw 2003. Forest Mensuration.4th ed. John Wiley & Sons Inc., New York, USA 443pp.

IIRS 2002. Biodiversity Characterization at Landscape Level in Western Ghats India Using Satellite Remote Sensing and GIS. Indian Institute of Remote Sensing, National Remote Sensing Agency), Dept. of Space, Dehradun 248001, Uttaranchal.

IPCC 2006. IPCC Guidelines for National Greenhouse Gas Inventories. Prepared by the National Greenhouse Gas Inventories Programme.Edited by H.S. Eggleston, L Buendia, K Miwa, T Ngara and K Tanabe. Japan, Institute for Global Environmental Strategies.

IUCN 2022. Guidelines for using the IUCN Redlist categories and criteria, version 15. Prepared by standards and petitions subcommittee. Downlodable from https://www.iucn redlist.org/documents/RedListGuidelines.pdf (accessed 10 July, 2022).

Keenan, R.J. 2015. Climate change impacts and adaptation in forest management: a review. Ann. For. Sci. 72(2): 145–167.
DOI: 10.1007/s13595-014-0446-5View Article Google Scholar

Kenzo, T., T. Ichie, D. Hattori, T. Itioka, C. Handa, T. Ohkubo, J.J. Kendawang, M. Nakamura, M. Sakaguchi, N. Takahashi, M. Okamoto, A. Tanaka-Oda, K. Sakurai and I. Ninomiya 2009. Development of allometric relationships for accurate estimation of above- and below-ground biomass in tropical secondary forests in Sarawak, Malaysia. J. Trop. Ecol. 25(4): 371–386.
DOI: 10.1017/S0266467409006129View Article Google Scholar

Macdicken, K.G. 1997. A guide of monitoring carbon emission from deforestation and degradation in developing countries: An examination of issues facing the incorporation of REDD into market-based climate policies. Resource for future, Washington DC, 84.

May, R.M. and M.P.H. Stump 2000. Species-area relations in tropical forests. Science 290(5499): 2084–2086.
DOI: 10.1126/science.290.5499.2084View Article Google Scholar

Meragiaw, M., Z. Woldu, V.B.R. Martinsen 2021. Floristic composition and structure of the Kibate forest along environmental gradients in Wonchi, Southwestern Ethiopia. J. For. Res. 32(6): 2669–2682.
DOI: 10.1007/s11676-021-01305-zView Article Google Scholar

Ojanuga, A.G. 2006. Agro ecological zones of Nigeria Manual. FAO/NSPFS, Federal Ministry of Agriculture and Rural Development, Abuja, Nigeria, 124pp.

Onyekwelu, J.C. and J.A. Olusola 2014. Role of the Sacred Grove in in-situ Biodiversity Conservation in Rainforest zone of south-western Nigeria. J. Trop. For. Sci. 26(1): 5–15.

Onyekwelu, J.C., A. Lawal, R. Mosandl, B. Stimm and A.D. Agbelade 2021. Understory species diversity, regeneration and recruitment potential of sacred groves in south west Nigeria. Trop. Ecol. 62(3): 427–442.
DOI: 10.1007/s42965-021-00157-2View Article Google Scholar

Onyekwelu, J.C., Agbelade, A.D., Tolorunju, M.S. Lawal, A. Stimm, B. and R. Mosandl 2022. Conservation potentials, tree species diversity, distribution and structure of sacred groves in south-western, Nigeria. J. Trop. For. Sci. 34(3): 334–346
DOI: 10.26525/jtfs2022.34.3.333View Article Google Scholar

Onyekwelu, J.C., R. Mosand and B. Stimm 2008. Tree species diversity and soil status of primary and degraded tropical rainforest ecosystems in South-Western Nigeria. J. Trop. For. Sci. 20(3): 193–204.

Pearson, T.R.H., S.L. Brown and R.A. Birdsey 2007. Measurement guidelines for the sequestration of forest carbon. General Technical Report NRS-18. Delaware: United States Department of Agriculture Forest Service, 18(1): 42.

Ramachandran, A., S. Jayakumar, R.M. Haroon, A. Bhaskaran and D.I. Arockiasamy 2007. Carbon sequestration: estimation of carbon stock in natural forests using geospatial technology in the Eastern Ghats of Tamil Nadu, India. Curr. Sci. 92:323–331.

Reid, W.V., H.A. Mooney, A. Cropper, D. Capistrano, S.R. Carpenter, K. Chopra, P. Dasgupta, T. Dietz, A.K. Duraiappah, R. Hassan, R. Kasperson, R. Leemans, R.M. May, A. J. McMichael, P. Pingali, C. Samper, R. Scholes, R.T. Watson, A.H. Zakri, Z. Shidong, N.J. Ash, E. Bennett, P. Kumar, M.J. Lee, C. Raudsepp-Hearne, H. Simons, J. Thonell and M.B. Zurek 2005. Ecosystems and Human Well-being-Synthesis: A Report of the Millennium Ecosystem Assessment. Island Press.https://edepot.wur.nl/45159.

Sandifer, P.A., A.E. Sutton-Grier and B.P. Ward 2015. Exploring connections among nature, biodiversity, ecosystem services, and human health and well-being: Opportunities to enhance health and biodiversity conservation. Ecosyst. Serv. 12:1–15.
DOI: 10.1016/j.ecoser.2014.12.007View Article Google Scholar

Steffen, W., K. Richardson, J. Rockstrom, S.E. Cornell, I. Fetzer, E.M. Bennett, R. Biggs, S.R. Carpenter, W. De vries, C.A. De Wit, C. Folke, D. Gerten, J. Heinke, G.M. Mace, L.M. Persson, V. Ramanathan, B. Reyers and S. Sorlin 2015. Planetary boundaries: Guiding human development on a changing planet. Science 347(6223): 376.
DOI: 10.1126/science.1259855View Article Google Scholar

Stoklosa, A.M., M.D. Ulyshen, Z. Fan, M. Varner, S. Seibold and J. M?ller 2016. Effects of mesh bag enclosure and termites on fine woody debris decomposition in a subtropical forest. Basic Appl. Ecol. 17(5):463–470.
DOI: 10.1016/j.baae.2016.03.001View Article Google Scholar

Tonolli, S., M. Rodeghiero, D. Gianelle, M. Dalponte, L. Bruzzone, L. Vescovo 2011. Mapping and modeling forest tree volume using forest inventory and airborne laser scanning. Eur. J. For. Res. 130(4): 569–577.
DOI: 10.1007/s10342-010-0445-5View Article Google Scholar

Wittmann, F., B.T. Zorzi, F.A.T. Tizianel, M.V.S. Urquiza, R.R. Faria, N.M. Sousa, E.D.S. Modena, R.M. Gamarr and A.L.M. Rosa 2008. Tree Species Composition, Structure and Aboveground Wood Biomass of a Riparian Forest of the Lower Miranda River, Southern Pantanal, Brazil. Folia Geobot. 43(4): 397–411.
DOI: 10.1007/s12224-008-9022-9View Article Google Scholar