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<p>The Indo-Gangetic Plains (IGP) lays the foundation of food security in South Asian countries. The ecology and land management practices (such as puddling) in rice-based systems differ markedly from those non-rice ones, which possibly influence the organic carbon (OC) stability and subsequent C sequestration in soil. The present investigation was conducted to study the effect of rice and non-rice-based cropping systems on C stability in soils of IGP. The OC stability in soil (1/K<sub>d</sub>), was assessed at different depths by the batch desorption experiment. Soil C mineralization, temperature sensitivity (<i>Q</i><sub><i>10</i></sub>), different fractions of C and lability index (LI) in surface soil were analyzed following standard protocols. Soils under rice based system recorded comparatively higher OC stability (22.8%) and a lower amount of mineralized C (25%) than non-rice-based system, with few exceptions. Irrespective of cropping system, C stability (1/K<sub>d</sub>) decreased with soil depth. The clay mineralogy and silt content played significant roles in OC stability and its mineralization in soils. The LI was also higher in the non-rice system compared to the rice system. The correlation matrix and principal component analysis suggested a positive association among the decay rate constant of C mineralization (K<sub>25 and</sub> K<sub>35</sub>), <i>Q</i><sub><i>10</i></sub> and active C fractions, while, their association with 1/K<sub>d,</sub> was found to be negative. Therefore, the parameters that clustered separately can serve as indicators of OC stability in soil. The rice-based cropping systems appear more sustainable in the IGP in terms of OC stability as well as the accumulation of stable OC in Inceptisol.</p>

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Stability of Organic Carbon in Soil Under Rice and Non-Rice-Based Cropping Systems in Indo-Gangetic Plains of India

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Ruma Das,
  • Ankita Trivedi,
  • Rahul Kumar,
  • Shrila Das,
  • Debarup Das,
  • Renu Singh,
  • Kader Ali Sarkar

摘要

The Indo-Gangetic Plains (IGP) lays the foundation of food security in South Asian countries. The ecology and land management practices (such as puddling) in rice-based systems differ markedly from those non-rice ones, which possibly influence the organic carbon (OC) stability and subsequent C sequestration in soil. The present investigation was conducted to study the effect of rice and non-rice-based cropping systems on C stability in soils of IGP. The OC stability in soil (1/Kd), was assessed at different depths by the batch desorption experiment. Soil C mineralization, temperature sensitivity (Q10), different fractions of C and lability index (LI) in surface soil were analyzed following standard protocols. Soils under rice based system recorded comparatively higher OC stability (22.8%) and a lower amount of mineralized C (25%) than non-rice-based system, with few exceptions. Irrespective of cropping system, C stability (1/Kd) decreased with soil depth. The clay mineralogy and silt content played significant roles in OC stability and its mineralization in soils. The LI was also higher in the non-rice system compared to the rice system. The correlation matrix and principal component analysis suggested a positive association among the decay rate constant of C mineralization (K25 and K35), Q10 and active C fractions, while, their association with 1/Kd, was found to be negative. Therefore, the parameters that clustered separately can serve as indicators of OC stability in soil. The rice-based cropping systems appear more sustainable in the IGP in terms of OC stability as well as the accumulation of stable OC in Inceptisol.