Land use influences microbial biomass carbon, organic carbon and nitrogen stock in a tropical acric luvisols of Southwestern Nigeria

Resumo

A study was conducted to determine the effect of different
land use on microbial biomass carbon, organic carbon and nitrogen
stock on a tropical acric luvisols at Ibadan, Oyo State, Southwestern
Nigeria. Soil samples were collected in 2014 using a quadrant
approach across ten plots at the surface (0-15 cm) and sub-surface
(16-30 cm) depths in four different land use systems of (i) 8-year old
citrus, (ii) 8 year old cacao, (iii) 8 year oil palm and (iv) a fallow
land of over 25 years. Significant differences in soil physical and
chemical properties, microbial biomass carbon, carbon and nitrogen
stock in different land use types at two depths (0-15 and 15-30 cm)
were observed on soil properties important for sustainable crop
production. Fallow land use, oil palm plantation and cocoa
plantation were characterized by higher carbon and nitrogen stock,
microbial biomass carbon, total nitrogen, organic carbon, available
phosphorus, marginally low exchangeable bases except for Ca and
Mg with relatively higher values and marginal C/N ratio. These land
use also had lower bulk density, high total porosity, high moisture
content and optimum soil temperature level. These results suggest
that incorporation of optimum fallow cycle with appropriate land use
in combination with soil enriching cover and tree crops in the study
area will increase carbon and nitrogen stock while imitating a forest
ecosystem condition which would help restore soil fertility in
degraded lands while reducing greenhouse gas fluxes.

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