Abstract
Soil acts as the niche of Carbon (C). Soil carbon sequestration is of paramount importance for sustaining soil health as well as mitigating global warming. Studies on soil organic C content of both surface as well as deep subsoil are very important. Besides, studies on C in rice soil, as well as non-rice upland soil of tropical India, are also of principal importance. With this background, the present experiment was undertaken to recognize qualitative characteristics of water-soluble soil C in rice soil and non-rice soil along depth using UV-Vis spectroscopy. Soil sampling was done from representative rice and non-rice soil ecologies in West Bengal from 0-20 cm, 100-120 cm and 120-140 cm soil depths. Quality and stability of C can be estimated by studying the nature of absorbance of water-soluble C in UV-visible range. Results indicated a higher absorbance of C in the subsurface than that of surface soil. Similarly, higher absorbance of C was recorded in soil collected from rice ecology compared to non-rice ecology. Irrespective of soil depth, it was noted that there was more humified as well as aromatic C in rice ecologies than that in non-rice ecologies. Thus soil of lower depth as well as rice ecologies acts as a better niche for sequestrating C in soil.
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