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Background and aims <p>The priming effect (PE) is crucial in terrestrial carbon cycling. However, the combined effects of temperature and litter quality on the PE and its temperature sensitivity (Q<sub>10</sub>) is poorly understood.</p> Methods <p>A 140-day incubation experiment was conducted by adding <sup>13</sup>C-labelled leaf litter of varying quality from <i>Acacia confusa</i>, <i>Cunninghamia lanceolata</i> and <i>Cyclobalanopsis glauca</i> to soil and incubated at 15&#xa0;°C, 25&#xa0;°C, and 35&#xa0;°C.</p> Results <p>Low-quality litter (<i>C. lanceolata</i> and <i>C. glauca</i>) induced a stronger positive PE and higher Q<sub>10</sub> than high-quality litter (<i>A. confusa</i>). However, the intensity of PE and its Q<sub>10</sub> decreased with rising temperature. This reduction was more pronounced in soil amended with high-quality litter. The PE was primarily regulated by litter lignin/N ratio and soil available N, while its Q<sub>10</sub> was driven by cellulase activity and lignin/N ratio. The stronger decline in PE and Q<sub>10</sub> under warming in the high-quality litter treatment was attributed to stronger suppression of litter decomposition, especially at 35&#xa0;°C, which restricted available C release, indirectly indicating intensified microbial C limitation and thus reduced microbial utilization of native soil organic carbon. Meanwhile, the increased soil available N under high-quality litter further diminished microbial N mining, collectively reducing the PE.</p> Conclusions <p>These findings demonstrate that under warming, soils receiving high-quality litter experience a greater reduction in PE and its Q<sub>10</sub> than those receiving low-quality litter, indicating that high-quality litter inputs may be more effective at mitigating soil C loss via the PE under global warming, at least in the soil system examined.</p>

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The reducing effect of warming on both the priming effect and its temperature sensitivity is modulated by litter quality

  • 期刊论文

  • 发表日期：

    2026年5月10日

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  • Qingyan Qiu,
  • Yaonan Zhang,
  • Lun Yan,
  • Jiguang Feng,
  • Abubakari Said Mgelwa,
  • Xiaojie Li,
  • Yalin Hu

摘要

Background and aims

The priming effect (PE) is crucial in terrestrial carbon cycling. However, the combined effects of temperature and litter quality on the PE and its temperature sensitivity (Q10) is poorly understood.

Methods

A 140-day incubation experiment was conducted by adding 13C-labelled leaf litter of varying quality from Acacia confusa, Cunninghamia lanceolata and Cyclobalanopsis glauca to soil and incubated at 15 °C, 25 °C, and 35 °C.

Results

Low-quality litter (C. lanceolata and C. glauca) induced a stronger positive PE and higher Q10 than high-quality litter (A. confusa). However, the intensity of PE and its Q10 decreased with rising temperature. This reduction was more pronounced in soil amended with high-quality litter. The PE was primarily regulated by litter lignin/N ratio and soil available N, while its Q10 was driven by cellulase activity and lignin/N ratio. The stronger decline in PE and Q10 under warming in the high-quality litter treatment was attributed to stronger suppression of litter decomposition, especially at 35 °C, which restricted available C release, indirectly indicating intensified microbial C limitation and thus reduced microbial utilization of native soil organic carbon. Meanwhile, the increased soil available N under high-quality litter further diminished microbial N mining, collectively reducing the PE.

Conclusions

These findings demonstrate that under warming, soils receiving high-quality litter experience a greater reduction in PE and its Q10 than those receiving low-quality litter, indicating that high-quality litter inputs may be more effective at mitigating soil C loss via the PE under global warming, at least in the soil system examined.