Vol. 8, Issue 4 (2020)
Quantitative assessment of water soluble fractions of organic carbon in deep soils under rice and non-rice ecology
Author(s): Deo Kumar and Munmun Majhi
Abstract: Soil is the largest terrestrial sink of Carbon (C). Carbon sequestration in soil is important for soil quality as well as to mitigate CO2 loading in atmosphere. Study on C of surface soil layer is going on for long time. Only in the recent past, scientists have noticed the importance of subsoil as a store house of stable C. On the contrary, study of C dynamics in tropical rice soil is important in countries like India where rice is the predominant crop and soil C sequestration is at risk due to high temperature. In this context, this study tried to understand the dynamics of soil C in deep soil under rice and non-rice ecology. Three distinct long term experimental sites were selected for soil sampling from three eastern states of India. Results indicated high total C and total organic C in surface soil in comparison to subsoil. On the other hand, rice soils had higher C than non-rice soil. The soil C was further divided into labile and recalcitrant pools using water extraction. As per water solubility, water soluble (room temperature) and hot water soluble C was highest in surface soil. This is natural as these pools represent labile C and surface soil receives maximum fresh C input in terms of deposited leaf and litter. The remaining C, not dissolved in water, was considered as recalcitrant C. While considering the water soluble pools as well as recalcitrant C as % of total organic C, trend indicated more labile C (water soluble) in surface soil while subsoil has more recalcitrant C. Therefore, this study conclusively indicated the potential of subsoil layer to act as a C sink in comparison to surface soil. The rice soil also has been identified as a niche for soil C sequestration.
DOI: 10.22271/chemi.2020.v8.i4ap.10165
Pages: 3327-3333 | 373 Views 72 Downloads
download (9454KB)
How to cite this article:
Deo Kumar, Munmun Majhi. Quantitative assessment of water soluble fractions of organic carbon in deep soils under rice and non-rice ecology. Int J Chem Stud 2020;8(4):3327-3333. DOI: 10.22271/chemi.2020.v8.i4ap.10165
