Diversity and Volume Assessment of Tree Species in the Tropical Forest at Obanla, Akure, Nigeria

Main Article Content

O. T. Olawoyin
A. S. Akinbowale
O. G. Olugbadieye
F. E. Adesuyi

Abstract

This study focused on the assessment of tree species diversity and abundance at The Federal University of Technology, Akure Tropical Forest Obanla. The research was carried out from May, 2019 to September, 2019. Complete enumeration sampling was adopted for the data collection and all trees with diameter at breast height (Dbh) above 0.1 m were identified and measured. Other tree growth variables, such as diameter at the base (db), diameter at the middle (dm), diameter at the top (dt) and the total height were all measured for volume estimation. Ricinodendron heudelotii Hd the highest number of stems (13), so it was the dominant tree species.The result shows that mean tree volume ranges from a minimum of 0.26 m3 for Olalaceae family, to a maximum of 77.70 m3 for Euphorbiaceae family. Ceiba pentandra of Malvaceae family had the highest mean volume (14.62 m2) while the lowest was recorded for both Khaya senegalensis and Newbouldia laevis with a volume of 0.13 m2. The family of Euphorbiaceae was regarded as the dominant family in the natural forest with 26 tree species which is the highest in this study and with the highest volume (77.70 m2). Shannon Wiener diversity index and species equitability index according to Pielou’s of 3.24 and 0.92 were respectively obtained for the study area. This study revealed the efficacy of an undisturbed natural forest in in situ conservation. Active regeneration can be carried out for proper stocking of the forest so has to make it a potential biodiversity hotspot.

Keywords:
Species diversity indices, tree growth variables, Euphorbiaceae, Olalaceae

Article Details

How to Cite
Olawoyin, O. T., Akinbowale, A. S., Olugbadieye, O. G., & Adesuyi, F. E. (2020). Diversity and Volume Assessment of Tree Species in the Tropical Forest at Obanla, Akure, Nigeria. Asian Journal of Research in Agriculture and Forestry, 5(4), 11-19. https://doi.org/10.9734/ajraf/2020/v5i430090
Section
Original Research Article

References

Zakaria M, Rajpar MN, Ozdemir I, Rosli Z. Fauna diversity in tropical rainforest: threats from land-use change. Tropical Forests-The Challenges of Maintaining Ecosystem Services while Managing the Landscape; 2016.

Lawal A, Adekunle VA. A silvicultural approach to volume yield, biodiversity and soil fertility restoration of degraded natural forest in South-West Nigeria. International Journal of Biodiversity Science, Eco-system Services & Management. 2013; 9(3):201-14.

FAO. Forest Resources Assessment Working Paper 177. Assessing forest degradation towards the development of globally applicable guidelines. Rome, Italy. 2011;109.

Foody GM, Cutler ME. Tree biodiversity in protected and logged Bornean tropical rain forests and its measurement by satellite remote sensing. Journal of Biogeography. 2003;30(7):1053-66.

Dent DH, Wright SJ. The future of tropical species in secondary forests: A quantitative review. Biological conserva-tion. 2009;142(12):2833-43.

Berry NJ, Phillips OL, Lewis SL, Hill JK, Edwards DP, Tawatao NB, Ahmad N, Magintan D, Khen CV, Maryati M, Ong RC. The high value of logged tropical forests: Lessons from northern Borneo. Biodiversity and Conservation. 2010; 19(4):985-97.

Gillespie TW, Brock J, Wright CW. Prospects for quantifying structure, floristic composition and species richness of tropical forests. International Journal of Remote Sensing. 2004;25(4):707-15.

Castelletta M, Thiollay JM, Sodhi NS. The effects of extreme forest fragmentation on the bird community of Singapore Island. Biological conservation. 2005;121(1):135-55.

Houghton RA. Why are estimates of the terrestrial carbon balance so different? Global change biology. 2003;9(4):500-9.

Shamaki SB, Akindele SO, Isah AD, Mohammed I. Height-diameter relationship models for Teak (Tectona grandis) plantation in Nimbia Forest Reserve, Nigeria. Asian Journal of Environment & Ecology. 2016;1-7.

Lindner M, Karjalainen T. Carbon inventory methods and carbon mitigation potentials of forests in Europe: A short review of recent progress. European Journal of Forest Research. 2007; 126(2):149-56.

Tonolli S, Rodeghiero M, Gianelle D, Dalponte M, Bruzzone L, Vescovo L. Mapping and modeling forest tree volume using forest inventory and airborne laser scanning. European Journal of Forest Research. 2011;130:569–577

Adekunle VA. Ecological and environmental implications of national development: A case study of Obanla natural forest, Federal University of Technology, Akure, Nigeria. Research Journal of Environmental Science. 2007;4:127-40.

Husch B, Beers TW, Kershaw Jr JA. Forest mensuration. 4th ed. Hoboken (NJ): John Wiley and Sons, Inc. 2003;443

Brashears MB, Fajvan MA, Schuler TM. An assessment of canopy stratification and tree species diversity following clearcutting in Appalachian hardwoods. Forest Science. 2004;50(1):54–61.

Price PW. Insect ecology (3rd ed.). New York: Wiley; 1997.

Kent M, Coker P. Vegetation description and analysis: A practical approach. London: Belhaven Press; 1992.

Akindele SO, LeMay VM. Development of tree volume equations for common timber species in the tropical rain forest area of Nigeria. Forest Ecology and Management. 2006;226(1-3):41-8.

Were JLR. Nigerian Lowland forests ATO123.
(Accessed 20, February 2020)
Available:http://www.worldwildlife.org/wildworld/profiles/terrestial/at/at0123_full.html

Sarumi MB, Ladipo DO, Denton L, Olapade EO, Badaru K, Ughasoro C. Nigeria: Country report to the FAO international technical conference on plant genetics resources, Leipzig. 1996;108.

Adekunle VA. Conservation of tree species diversity in tropical rainforest ecosystem of South-West Nigeria. Journal of Tropical Forest Science. 2006:91-101.

Onyekwelu JC, Mosandl R, Stimm B. Tree species diversity and soil status of primary and degraded tropical rainforest ecosystems in south-western Nigeria. Journal of Tropical Forest Science. 2008; 193-204.

Isichei AO. Omo biosphere reserve, current status, utilization of biological resources and sustainable management (Nigeria). UNESCO; 1995.

Onyekwelu JC, Adekunle VA, Adeduntan SA. Does tropical rainforest ecosystem possess the ability to recover from severe degradation. In Sustainable forest management in Nigeria: lessons and prospects. Proceeding of the 30th Annual Conference of Forestry Association of Nigeria, Kaduna, Nigeria. 2005;145-163.

Indian Institute of Remote Sensing, India. Department of Biotechnology, India. Department of Space. Biodiversity Characterization at Landscape Level in Western Himalayas, India Using Satellite Remote Sensing and Geographic Information System: A Joint Project of the Department of Biotechnology, Government of India & Department of Space, Government of India. Indian Institute of Remote Sensing, Department of Space, Government of India; 2002.

Hawthorne WD, Marshall CA, Juam MA, Agyeman VK. The impact of logging damage on tropical rainforest, their recovery and regeneration. An Annotated Bibliography. 2011;47-121.

Adekunle VAJ, Adewole OO, and Akindele SO. Tree species diversity and structure of a Nigerian strict nature reserve. Tropical Ecology. 2013;275-289.

Alder D, Abayomi JO. Assessment of data requirements for sustained yield calculations. Unpublished report prepared for the Nigeria Tropical Action Programme, FORMECU, Federal Department of Forestry, Ibadan, Nigeria. 1994;28.