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Background and aims <p>Climate change and associated alteration of temperature and weather pattern in response to extreme natural and/or anthropogenic activities disturb the equilibrium between addition and loss of carbon in the soil system. This study aimed to quantify the fractions of soil organic carbon (SOC), sequestration potential, carbon loss through mineralization and its sensitivity to rising temperature in a <i>Himalayan</i> Mollisol.</p> Methods <p>Soil samples were collected from three successive layers (0–15, 15–30 and 30–45&#xa0;cm) across six treatments viz<i>.</i> control, N, NPK, NPKZn, NPKF, NPKZnF of a 38&#xa0;years old long-term experiment with rice–wheat system and analysed for various carbon based soil attributes.</p> Results <p>Significantly higher content of SOC (12.7&#xa0;g&#xa0;kg<sup>−1</sup>), microbial biomass carbon (590&#xa0;µg&#xa0;g<sup>−1</sup>), microbial quotient (4.65%) and β glucosidase activity (24.3&#xa0;µg&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup>) was evident from NPKZnF treatment across the layers. The highest carbon sequestration potential of 15.76&#xa0;Mg C ha<sup>−1</sup> was recorded from NPKZnF. The NPKF showed 40% higher temperature sensitivity (Q<sub>10</sub>) over control in surface layer; however, both the Q<sub>10</sub> and activation energy declined in bottom layers. Nevertheless, respiratory quotient and decay rate was noticeably lower in the NPKF and NPKZnF, indicating enhanced microbial carbon utilization efficiency and its longer retention.</p> Conclusions <p>The study emphasized the strong potential of the NPKZnF and NPKF treatments in maintaining SOC level, enhancing microbial activities and to counteract the loss of organic carbon from soil; hence, these management systems may be recommended for sequestering carbon and sustaining ecosystem services in the warm humid regions of <i>Himalaya.</i></p>

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Carbon sequestration and mineralization kinetics under long-term rice–wheat system in a Himalayan Mollisol

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Riaj Rahaman,
  • Sunanda Biswas,
  • D. K. Singh,
  • Priya Singh,
  • Kalyani Patil,
  • Suman Kumar Surendra

摘要

Background and aims

Climate change and associated alteration of temperature and weather pattern in response to extreme natural and/or anthropogenic activities disturb the equilibrium between addition and loss of carbon in the soil system. This study aimed to quantify the fractions of soil organic carbon (SOC), sequestration potential, carbon loss through mineralization and its sensitivity to rising temperature in a Himalayan Mollisol.

Methods

Soil samples were collected from three successive layers (0–15, 15–30 and 30–45 cm) across six treatments viz. control, N, NPK, NPKZn, NPKF, NPKZnF of a 38 years old long-term experiment with rice–wheat system and analysed for various carbon based soil attributes.

Results

Significantly higher content of SOC (12.7 g kg−1), microbial biomass carbon (590 µg g−1), microbial quotient (4.65%) and β glucosidase activity (24.3 µg g−1 h−1) was evident from NPKZnF treatment across the layers. The highest carbon sequestration potential of 15.76 Mg C ha−1 was recorded from NPKZnF. The NPKF showed 40% higher temperature sensitivity (Q10) over control in surface layer; however, both the Q10 and activation energy declined in bottom layers. Nevertheless, respiratory quotient and decay rate was noticeably lower in the NPKF and NPKZnF, indicating enhanced microbial carbon utilization efficiency and its longer retention.

Conclusions

The study emphasized the strong potential of the NPKZnF and NPKF treatments in maintaining SOC level, enhancing microbial activities and to counteract the loss of organic carbon from soil; hence, these management systems may be recommended for sequestering carbon and sustaining ecosystem services in the warm humid regions of Himalaya.