Okoh Et Al


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




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 No.: 052719103

Type: Research




Leaf decomposition rates in Prosopis africana, Parkia biglobosa,
Daniellia oliveri
and Morinda
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
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




*Corresponding Author

Okoh T.

E-mail: thomasokoh@



decomposition; Nutrient dynamics; % carbon; Nutrient accumulation index;
Turnover rate; Prosopis Africana; Parkia biglobosa; Daniellia oliveri;
Morinda lucida



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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,

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