Dynamics of organic carbon in deep soils under rice and non-rice cropping systems

Shovik Deb, Somsubhra Chakraborty, David C. Weindorf, Arjun Murmu, Pabitra Banik, Manoj Kanti Debnath, Ashok Choudhury

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4 Scopus citations

Abstract

Subsoil might be a possible sink of stable C in some regions of India, which itself has low soil C storage. Further, knowledge of subsoil C chemistry under submerged rice ecology is required as rice is one of the major staple cereals in India and waterlogging influences SOC characteristics. This study investigated the dynamics of organic C in surface and deep subsoil layers under rice and non-rice ecology in eastern India. Outcomes revealed less organic C in deep subsoils (x− 5.35 Mg ha− 1), but with higher residence time as evidenced by a higher mean recalcitrant index (20.2) and lower mean lability index (1.86). Further, deep rice soils exhibited higher C sequestration potential than deep non-rice soils resulting from curbed microbial biomass and their activities. Summarily, deep rice soil exhibited the potential for C sequestration, displaying a synergistic effect from deep soil and submerged rice ecology.

Original languageEnglish
Pages (from-to)388-394
Number of pages7
JournalGeoderma Regional
Volume7
Issue number4
DOIs
StatePublished - Dec 1 2016

Keywords

  • C sequestration potential
  • Deep subsoil
  • Submerged rice ecology

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    Deb, S., Chakraborty, S., Weindorf, D. C., Murmu, A., Banik, P., Debnath, M. K., & Choudhury, A. (2016). Dynamics of organic carbon in deep soils under rice and non-rice cropping systems. Geoderma Regional, 7(4), 388-394. https://doi.org/10.1016/j.geodrs.2016.11.004