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<p>A key uncertainty in understanding whether warming accelerates soil carbon (C) loss lies in how this response depends on other co-occurring environmental changes and the underlying mechanisms. Here we show that, in a 12-year grassland experiment, warming reduces soil C by 12.2% under drought but increases it by 6.7% under wet conditions. Such C losses during drought primarily result from the declines in mineral-associated organic C. These contrasting responses are closely linked to microbial processes: warming elevates microbial metabolic quotient under drought but suppresses it under wet conditions, accompanied by shifts in microbial community composition and C-degrading genes. Integrating these microbial metrics into an ecosystem model substantially improves predictions of soil C dynamics. These findings demonstrate the pivotal role of microbial processes in mediating soil C–climate feedbacks and underscore their critical importance for accurately projecting soil C dynamics in a warmer, potentially drier world.</p>

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Drought amplifies warming-induced soil carbon loss in a decade-long experiment

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Xue Guo,
  • Zhifeng Yang,
  • Siyang Jian,
  • Daliang Ning,
  • Xuanyu Tao,
  • Linwei Wu,
  • Lauren Hale,
  • Mengting Yuan,
  • Xishu Zhou,
  • Qian Li,
  • Yuxiang Zhang,
  • Mengying Zhao,
  • Shun Han,
  • Qiuting Zhang,
  • Gangsheng Wang,
  • Qun Gao,
  • Huaqun Yin,
  • Junzhong Zhang,
  • Tianjiao Dai,
  • Jonathan P. Michael,
  • Reece D. V. Lennon,
  • Zheng Shi,
  • Liyou Wu,
  • Yunfeng Yang,
  • Xueduan Liu,
  • Jizhong Zhou

摘要

A key uncertainty in understanding whether warming accelerates soil carbon (C) loss lies in how this response depends on other co-occurring environmental changes and the underlying mechanisms. Here we show that, in a 12-year grassland experiment, warming reduces soil C by 12.2% under drought but increases it by 6.7% under wet conditions. Such C losses during drought primarily result from the declines in mineral-associated organic C. These contrasting responses are closely linked to microbial processes: warming elevates microbial metabolic quotient under drought but suppresses it under wet conditions, accompanied by shifts in microbial community composition and C-degrading genes. Integrating these microbial metrics into an ecosystem model substantially improves predictions of soil C dynamics. These findings demonstrate the pivotal role of microbial processes in mediating soil C–climate feedbacks and underscore their critical importance for accurately projecting soil C dynamics in a warmer, potentially drier world.