Sub-soil carbon and nitrogen sequestration: soil profile measurement approach
2016
Ahukaemere C. M.
Carbon sequestration is the process of transferring atmospheric carbon dioxide into the soil and storing it securely so it is not immediately re-emitted into the atmosphere. A thorough understanding of carbon and nitrogen sequestration in various horizons of the soil profile would be helpful to comprehend carbon and nitrogen cycling from a pedological perspective. The quantity of carbon and nitrogen sequestered at different horizons of the soil profile pit was investigated. Results showed that the mean organic carbon content of the soils varied from 6.81 to 37.75 g kg-1. The organic carbon content of the individual horizon varied substantially within the profiles. Carbon and nitrogen sequestration capacities of the soils varied from 3142.60 – 7643.25 g C m-2, 101.33 – 503.55 g N m-2 and increased with horizon thickness in all the soil profiles. Bulk density has significant positive relationship with the amount of carbon sequestered in the soil. The results of regression analysis showed that with the effect of horizon thickness, bulk density and organic carbon on carbon sequestration, the regression coefficient of determination (R2 ) was 0.693 (p<0.001). On N sequestration versus horizon thickness, bulk density and total nitrogen, it was found that 67 % of the variation (significant at p<0.001) in soil nitrogen sequestration capacity was due to the aforementioned independent variables in soil.
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