Aggregate characteristics and aggregate-associated soil organic carbon and carbohydrates of soils under contrasting tree land use

Clay content Organic matter fraction Plant cover Soil structure Water-stable aggregates

Authors

  • Bassey Udom
    ebassidy@yahoo.com
    Department of Crop and Soil, University of Port Harcourt, P.M.B. 5323, Port Harcourt , Nigeria
  • Joshua Ogunwole Bowen University, Iwo, P.M.B. 284, Osun State , Nigeria
  • Chima Wokocha Department of Crop and Soil, University of Port Harcourt, P.M.B. 5323, Port Harcourt , Nigeria
July 22, 2021
November 3, 2021
December 26, 2021

Protection of soil organic carbon and acid-hydrolyzable carbohydrates in aggregate-size fractions is important for appraising soil degradation and aggregation under land use types. Aggregate-associated soil organic carbon (SOC) and acid-hydrolyzable carbohydrates (R-CHO) in bulk soils and aggregate-size fractions of a sandy loam soil under Alchornea bush, Rubber, Oil palm and Teak plantations in southern Nigeria were studied. Results revealed significant differences in aggregate-associated SOC and R-CHO, bulk densities, total porosity, soil organic carbon stock and aggregate stability among the land use types. Greater SOC was stored in macro-aggregates >0.25 mm, while greater R-CHO was occluded in micro-aggregates <0.25 mm (p<0.05). The highest mean weight diameter (MWD) was 1.01 mm in Alchornea soils and 0.92 mm in Oil palm plantation at 0-15 cm topsoil. Soil organic carbon stock in 0-15 cm topsoil was 77.7, 81.8, 92.2, and 67.5 kg C ha-1 in Alchornea, Rubber, Oil palm, and Teak soils, respectively. Relationships showed a positive linear correlations between MWD and SOC (r = 0.793, p < 0.05) and R-CHO (r = 0.789. p < 0.05). Alchornea bush and Oil palm plantation increased macro-aggregate formation and macro-pores >5 µm, therefore they have greater potentials to boost protection of SOC in soil macro-aggregates.

How to Cite

Udom, B., Ogunwole, J., & Wokocha, C. (2021). Aggregate characteristics and aggregate-associated soil organic carbon and carbohydrates of soils under contrasting tree land use. SAINS TANAH - Journal of Soil Science and Agroclimatology, 18(2), 126-135. https://doi.org/10.20961/stjssa.v18i2.53615