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Aim <p>The temperature sensitivity of labile (Q<sub>10L</sub>) and recalcitrant (Q<sub>10R</sub>) pools of soil organic carbon (SOC) decomposition is a critical for predicting soil carbon (C) fluxes.</p> Methods <p>Soils under six grass covers, namely, <i>Cenchrus ciliaris</i>, <i>Chrysopogon fulvus</i>, <i>Panicum maximum</i>, <i>Sehima nervosa</i>, <i>Heteropogon contortus</i>, and <i>Vetiveria zizanioides</i> from semi-arid India were evaluated for Q<sub>10L</sub> and Q<sub>10R</sub> of bulk soil, macroaggregates, microaggregates, and silt + clay associated SOC. Soil fractions (from 0–20 and 21–40&#xa0;cm depths) were incubated at 25, 32, and 37&#xa0;°C for 100&#xa0;days, and cumulative C mineralization was measured. The Q<sub>10L</sub> and Q<sub>10R</sub> were calculated using a two-pool decay model. The quality of root litter C and SOC was assessed through FTIR spectroscopy.</p> Results <p>Q<sub>10L</sub> and Q<sub>10R</sub> of microaggregate-C was significantly higher (22–64% and 22–24%, respectively) than macroaggregate-C and silt + clay-C. Among grasses, Q<sub>10L</sub> and Q<sub>10R</sub> values under <i>C.ciliaris</i>, <i>H.contortus</i>, and <i>S. nervosa</i> were lower (by 6–35%) than other grasses, indicating their capability to store SOC under global warming scenarios. Q<sub>10L</sub> at topsoil layer was correlated with root litter C quality (r = -0.641 to 0.633) and at the sub-surface soil layer, it was influenced by labile C concentration (r &gt; 0.637). The Q<sub>10R</sub> was correlated with the recalcitrant C concentration (r &gt; 0.721) and SOC quality in both soil layers, indicating that quality and availability of recalcitrant SOC had pivotal roles in governing Q<sub>10R</sub> in restored land.</p> Conclusions <p>Soil C and litter C quality should be potentially incorporated into the biogeochemical models to better predict SOC dynamics in managed ecosystems in the context of global warming and land use changes.</p>

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Grass root litter and soil carbon quality contrarily control Q10 of labile and recalcitrant carbon pools in a semi-arid inceptisol

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Vikas Kumar Singhal,
  • Avijit Ghosh,
  • Amit K. Singh,
  • Ranjan Bhattcahryya,
  • Yogeshwar Singh,
  • Sourav Kumar,
  • Deepak Ojha,
  • Arun K. Shukla

摘要

Aim

The temperature sensitivity of labile (Q10L) and recalcitrant (Q10R) pools of soil organic carbon (SOC) decomposition is a critical for predicting soil carbon (C) fluxes.

Methods

Soils under six grass covers, namely, Cenchrus ciliaris, Chrysopogon fulvus, Panicum maximum, Sehima nervosa, Heteropogon contortus, and Vetiveria zizanioides from semi-arid India were evaluated for Q10L and Q10R of bulk soil, macroaggregates, microaggregates, and silt + clay associated SOC. Soil fractions (from 0–20 and 21–40 cm depths) were incubated at 25, 32, and 37 °C for 100 days, and cumulative C mineralization was measured. The Q10L and Q10R were calculated using a two-pool decay model. The quality of root litter C and SOC was assessed through FTIR spectroscopy.

Results

Q10L and Q10R of microaggregate-C was significantly higher (22–64% and 22–24%, respectively) than macroaggregate-C and silt + clay-C. Among grasses, Q10L and Q10R values under C.ciliaris, H.contortus, and S. nervosa were lower (by 6–35%) than other grasses, indicating their capability to store SOC under global warming scenarios. Q10L at topsoil layer was correlated with root litter C quality (r = -0.641 to 0.633) and at the sub-surface soil layer, it was influenced by labile C concentration (r > 0.637). The Q10R was correlated with the recalcitrant C concentration (r > 0.721) and SOC quality in both soil layers, indicating that quality and availability of recalcitrant SOC had pivotal roles in governing Q10R in restored land.

Conclusions

Soil C and litter C quality should be potentially incorporated into the biogeochemical models to better predict SOC dynamics in managed ecosystems in the context of global warming and land use changes.