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Background and aims <p>Soil priming effect (PE) is crucial for understanding soil organic carbon (C) dynamics under global changes, yet the combined effects of warming and C input levels across soil depths remains unclear.</p> Methods <p>We performed a 100-day incubation experiment with <i>Cunninghamia lanceolata</i> forest soils to examine PE responses to warming (ambient temperature vs. ambient temperature + 5&#xa0;°C) and glucose inputs levels (low vs. high; 3 vs. 5 times of microbial biomass C).</p> Results <p>The results indicate that warming reduced PE by 40% and 4% under low and high amount of C inputs in topsoil (0–10&#xa0;cm), and by 70% and 59% in subsoil (30–40&#xa0;cm), likely due to microbial adaptation or depletion of soil resources. Moreover, a higher C amount input increased PE by 43% and 42% in topsoil and subsoil at ambient temperature, and by 65% and 58% under warming, which may be the result of microbial nitrogen mining. Regardless of the amount of C input, PE in topsoil consistently exceeded that in subsoil. This was attributed to the higher levels of extractable organic C in topsoil, which supported greater microbial activity, thereby enhancing C mineralization and PE.</p> Conclusion <p>The negative effect of warming on PE and the positive effect of high C amount input on PE may potentially benefit soil organic C storage under ongoing climate change.</p>

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Warming reduces soil priming effects in a subtropical forest regardless of soil depth and carbon input amount

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Xinyu Bai,
  • Qiufang Zhang,
  • Jiguang Feng,
  • Xiaoxia Wu,
  • Quanxin Zeng,
  • Xiaoqing Zhang,
  • Xiaochun Yuan,
  • Xiangyin Ni,
  • Yuehmin Chen

摘要

Background and aims

Soil priming effect (PE) is crucial for understanding soil organic carbon (C) dynamics under global changes, yet the combined effects of warming and C input levels across soil depths remains unclear.

Methods

We performed a 100-day incubation experiment with Cunninghamia lanceolata forest soils to examine PE responses to warming (ambient temperature vs. ambient temperature + 5 °C) and glucose inputs levels (low vs. high; 3 vs. 5 times of microbial biomass C).

Results

The results indicate that warming reduced PE by 40% and 4% under low and high amount of C inputs in topsoil (0–10 cm), and by 70% and 59% in subsoil (30–40 cm), likely due to microbial adaptation or depletion of soil resources. Moreover, a higher C amount input increased PE by 43% and 42% in topsoil and subsoil at ambient temperature, and by 65% and 58% under warming, which may be the result of microbial nitrogen mining. Regardless of the amount of C input, PE in topsoil consistently exceeded that in subsoil. This was attributed to the higher levels of extractable organic C in topsoil, which supported greater microbial activity, thereby enhancing C mineralization and PE.

Conclusion

The negative effect of warming on PE and the positive effect of high C amount input on PE may potentially benefit soil organic C storage under ongoing climate change.