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<p>The ratio of soil heterotrophic respiration to total soil respiration (R<sub>h</sub>/R<sub>s</sub>) is critical for soil carbon pool stability and atmosphere-biosphere exchanges, yet its spatiotemporal dynamics and responses to environmental drivers remain poorly constrained. Here, we estimate global soil and heterotrophic respiration by integrating ground observations with machine learning models. From 1980 to 2022, annual increases reached 0.76 and 0.54 g C m⁻² yr⁻² for soil and heterotrophic respiration, respectively. Globally, R<sub>h</sub>/R<sub>s</sub> averaged 61.30 ± 0.54% with a decadal rise of 0.13%. Rising soil temperature enhances R<sub>h</sub>/R<sub>s</sub>, while soil moisture suppresses it, exhibiting stronger global-scale influence. Temperature dominates R<sub>h</sub>/R<sub>s</sub> regulation in forests and shrublands, whereas moisture controls this ratio in grasslands and croplands. These findings elucidate ecosystem-specific mechanisms governing R<sub>h</sub>/R<sub>s</sub> dynamics, advancing predictions of soil carbon-climate feedbacks essential for carbon neutrality strategies.</p>

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Various responses of global heterotrophic respiration to variations in soil moisture and temperature enhance the positive feedback on atmospheric warming

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月18日

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  • Jingyu Zeng,
  • Tao Zhou,
  • Li Cao,
  • Ying Yu,
  • E. Tan,
  • Yajie Zhang,
  • Xuemei Wu,
  • Jingzhou Zhang,
  • Qi Zhang,
  • Yancheng Qu,
  • Jian Liu,
  • Peixia Liu,
  • Xia Liu,
  • Hui Luo

摘要

The ratio of soil heterotrophic respiration to total soil respiration (Rh/Rs) is critical for soil carbon pool stability and atmosphere-biosphere exchanges, yet its spatiotemporal dynamics and responses to environmental drivers remain poorly constrained. Here, we estimate global soil and heterotrophic respiration by integrating ground observations with machine learning models. From 1980 to 2022, annual increases reached 0.76 and 0.54 g C m⁻² yr⁻² for soil and heterotrophic respiration, respectively. Globally, Rh/Rs averaged 61.30 ± 0.54% with a decadal rise of 0.13%. Rising soil temperature enhances Rh/Rs, while soil moisture suppresses it, exhibiting stronger global-scale influence. Temperature dominates Rh/Rs regulation in forests and shrublands, whereas moisture controls this ratio in grasslands and croplands. These findings elucidate ecosystem-specific mechanisms governing Rh/Rs dynamics, advancing predictions of soil carbon-climate feedbacks essential for carbon neutrality strategies.