_____________________________________________________________________________________________________ *Corresponding author: E-mail: oladoyeao@funaab.edu.ng; Asian Journal of Environment & Ecology 17(2): 58-70, 2022; Article no.AJEE.82722 ISSN: 2456-690X Carbon Stock in above and below Ground Biomass of Three Age Series of Pinus carribaea and Nauclea diderrichii Plantations; Omo Forest, Area J4 Ogun State, Nigeria A. O. Oladoye a* , O. O. Ojekunle a , P. O. Ige b , A. O. Basiru a , O. J. Oyelowo c , D. O. Ojo a and E. O. Ojo a a Department of Forestry and Wildlife Management, Federal University of Agriculture, College of Environment Resources Management, P.M.B 2240, Alabata , Abeokuta, Ogun State, Nigeria. b Department of Social and Environmental Forestry, University of Ibadan, Nigeria. c Forestry Research Institute of Nigeria, Ibadan, Nigeria. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/AJEE/2022/v17i230290 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/82722 Received 15 December 2021 Accepted 17 February 2022 Published 25 February 2022 ABSTRACT Forest carbon is identified in three major pools that is, above and below ground living vegetation, dead organic matter and soil organic carbon whose quantities have been identified for few forest types. The study investigated the carbon stock in above and below ground biomass in three age series of Pinus (1991, 1992 and 1996) and Nauclea (1974, 1975 and 1976) plantations at area J4, Ogun state Nigeria. Five plots of 20m x 20m dimension were randomly laid making a total of 30 plots. Diameter at breast height and height were measured using diameter tape and Spiegel Relaskop respectively. Soil samples were collected in each plantation at 0–15cm and 15–30cm depth with the aid of soil auger and laboratory analysis carried out. Data were analyzed using the General Linear Model of SAS software. Analysis of Variance (ANOVA) and Duncan Multiple Range Test was used to separate means and correlation analysis was carried out. Above ground was estimated using Brown et al. (1989) equation {Y= 34.4703- 8.0671 (DBH) + 0.6589(DBH 2 )} and below ground biomass was also estimated as 20% of above ground biomass. Result showed that Original Research Article