Okoh et al Greener Journal of Agricultural Sciences Vol. 9(2), pp. 250-258, 2019 ISSN: 2276-7770 Copyright ©2019, the copyright of this article is retained by the author(s) DOI Link: http://doi.org/10.15580/GJAS.2019.2.052719103 http://gjournals.org/GJAS Leaf Decomposition and Nutrient Release in Four Selected Species in Makurdi, Benue State, Nigeria Okoh T.1; Edu E.A.2; Ebigwai J.K.2 1 Department of Botany, Federal University of Agriculture Makurdi, Nigeria. 2 Department of Plant and Ecological Studies, University of Calabar, Nigeria. ARTICLE INFO ABSTRACT Article No.: 052719103 Type: Research DOI: 10.15580/GJAS.2019.2.052719103 Leaf decomposition rates in Prosopis africana, Parkia biglobosa, Daniellia oliveri and Morinda lucida were investigated in Makurdi, Benue State, Nigeria. Decomposition was determined as loss in mass of litter over a period of 8 weeks (January 15- March 15, 2016 and August 15 –October 15, 2016). The exponential decay model Wt / W0 =e–kd t. was used to evaluate the percentage mass of litter remaining over time while the time taken for half the initial material to decompose (t50) was evaluated using t50= ln 2/k and the nutrient accumulation index was determined by (NAI = ωtXt/ωoXo) Leaf decomposition rates (g d-1) varied significantly (p<0.01) with species exposure time with % dry weight remaining ranging from 89.63% to 77.4% in both seasons. P. africana (0.0033, 0.0039) had the fastest decomposition rates in both seasons, while P. biglobosa, M. lucida and D. oliveri (0.0017) were slowest in the wet season. Mean projected residence time ranged between 363 and 476 days (wet and dry seasons) across species. Average C: N ratio increased generally across species in both seasons with a net mineralization of nitrogen except in M. lucida (0.99) and D. oliveri (0.16), while carbon was immobilized except in P. africana (0.93) with net mineralization in both seasons. The contributions of selected species in nutrient cycling are implicated in this study, hence their importance in ecosystem management. Submitted: 27/05/2019 Accepted: 30/05/2019 Published: 13/06/2019 *Corresponding Author Okoh T. E-mail: thomasokoh@ gmail.com Keywords: Litter decomposition; Nutrient dynamics; % carbon; Nutrient accumulation index; Turnover rate; Prosopis Africana; Parkia biglobosa; Daniellia oliveri; Morinda lucida Return to Content View [Full Article – PDF] [Full Article – HTML] [Full Article – EPUB] Post-Publication Peer-review Rundown View/get involved, click [Peer-review] REFERENCES Abugre, S. C., Oti-Boateng & Yeboah, M. F. (2011). Litterfall and decomposition trend of Jatropha curcas L. leaves mulches under two environmental conditions. Agriculture and Biology Journal of North America, 2(3), 462-470. Aldair, E. C., Hobbie, S. E. & Hobbie, R. K. (2010). Single pool exponential decomposition models; potential pit falls in their use in ecological studies. 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Journal of Plant Ecology, 1(2), 85-93. Cite this Article: Okoh T; Edu EA; Ebigwai JK (2019). Leaf Decomposition and Nutrient Release in Four Selected Species in Makurdi, Benue State, Nigeria. Greener Journal of Agricultural Sciences 9(2): 250-258, http://doi.org/10.15580/GJAS.2019.2.052719103.