Long-term effect of rice-based cropping systems on pools of soil organic carbon in farmer's field in hilly agroecosystem of Manipur, India

Environmental Monitoring and Assessment
Thounaojam Thomas MeeteiYumnam Bijilaxmi Devi

Abstract

A comprehensive study on various pools of soil organic carbon (SOC) under different rice-based cropping systems is necessary for predicting their effect on soil quality through carbon build-up in soil and their impact on global climate change. The present investigation was undertaken to study the long-term effect of six different rice-based cropping systems (continuously followed by farmers > 10 years) on various SOC pools viz., total organic carbon (TOC), oxidizable organic carbon (Coc) and its different fractions [Cfrac1 (very labile), Cfrac2 (labile), Cfrac3 (less labile) and Cfrac4 (non-labile)], soil microbial biomass carbon (SMBC) and lability index (LI) and SOC stock at the farmer's field of Kakching district under hilly ecosystems of Manipur, India. In every cropping system, all the fractions of Coc were significantly decreased with increasing soil depth. Among all the fractions, Cfrac4 (non-labile) constituted the largest percentage of TOC for both surface (0-20 cm) and sub-surface (20-40 cm) soil varying from 47.95-58.45% and 55.76-64.83% with average values of 51.87 and 59.73% respectively. Results also revealed that the Cfrac1 (very labile) of Coc constituted highest (42.79%) percentage of Coc and that of Cfract4 co...Continue Reading

References

Feb 26, 2016·Scientific Reports·Ren-Min YangDe-Cheng Li
Apr 15, 2016·Nature·Keith PaustianPete Smith

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