Assessment of Soil Organic Carbon in particle-size aggregates under agricultural-land use types in subtropical India

The aim of present study was to evaluate the levels and spatio-temopral variation of Soil Organic Carbon (SOC) in different particle-size aggregates (bulk, coarse sand, fine sand and silt+clay) in the agricultural field of National Capital Region (NCR) in subtropical India. Soil samples were collected from periurban vegetable cultivation areas during three seasons of 2011-12. The conventional analytical method (Walkley Black) was used to estimate the SOC levels for all the particle-size aggregates. The results showed that the mean SOC in bulk samples was 10.97 mg g -1 while values for Fraction-I (Coarse sand), Fraction-II (Fine sand) and Fraction-III (silt + clay) were estimated to be 9.17±1.87 mg g -1 , 12.61±3.08 mg g -1 and 18.04±3.81 mg g -1 , respectively during overall studied period. Distinct seasonal differences have been noticed in the levels of SOC in bulk and fractional samples as highest in winter followed by monsoon and summer. Different photochemical degradation rate due to temperature variation during different seasons could be attributed as reason for seasonal variability of SOC. The levels of SOC is increased with decreasing of the soil particle size aggregates which infers silt+clay having highest contribution followed by fine sand and coarse sand. Silt+clay are governing factor for SOC enrichment in soil because greater surface area to volume ratios of such finer particles provides more potential binding sites for organic carbon. Detailed investigation of SOC storage alongwith edaphic/vegetation factors and land use change is required to understand carbon sequestration, quality and sustainability of agricultural soil.

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