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<p>Permafrost regions contain a substantial fraction of Earth’s soil nitrogen, which is vulnerable to climate change. The response of this crucial N stock to warming could impact the permafrost–climate feedback by altering plant productivity, microbial decomposition and nitrous oxide emissions. However, the long-term trajectory of soil N stocks in response to warming remains unclear. Here we present results from a ten-year field warming experiment in a permafrost ecosystem on the Tibetan Plateau. We made repeated measurements of soil N stocks to 50 cm depth and assessed 28 N-cycling variables to explore three primary pathways affecting soil N stocks, including N inputs, microbial N transformations and N losses. Our results reveal that, despite no changes being observed during the initial years of the experiment, warmed plots experienced a decline in surface soil N stocks (an average 7.7% reduction relative to control plots) after eight years of warming. This decrease is associated with the enhanced N sequestration in perennial plant biomass, increased ecosystem N leaching and gaseous N losses from soils. Our findings underscore the vulnerability of soil N stocks in permafrost regions to ongoing warming, and suggest that the potential permafrost–climate feedback may be stronger than previously anticipated.</p>

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Progressive decline in soil nitrogen stocks with warming in a Tibetan permafrost ecosystem

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Bin Wei,
  • Dianye Zhang,
  • Carolina Voigt,
  • Wei Zhou,
  • Yuxuan Bai,
  • Zhihu Zheng,
  • Yuhong Xie,
  • Chunbao Zhao,
  • Feiqi Wang,
  • Luyao Huang,
  • Guibiao Yang,
  • Dan Kou,
  • Yunfeng Peng,
  • Yiqi Luo,
  • Josep Peñuelas,
  • Yuanhe Yang

摘要

Permafrost regions contain a substantial fraction of Earth’s soil nitrogen, which is vulnerable to climate change. The response of this crucial N stock to warming could impact the permafrost–climate feedback by altering plant productivity, microbial decomposition and nitrous oxide emissions. However, the long-term trajectory of soil N stocks in response to warming remains unclear. Here we present results from a ten-year field warming experiment in a permafrost ecosystem on the Tibetan Plateau. We made repeated measurements of soil N stocks to 50 cm depth and assessed 28 N-cycling variables to explore three primary pathways affecting soil N stocks, including N inputs, microbial N transformations and N losses. Our results reveal that, despite no changes being observed during the initial years of the experiment, warmed plots experienced a decline in surface soil N stocks (an average 7.7% reduction relative to control plots) after eight years of warming. This decrease is associated with the enhanced N sequestration in perennial plant biomass, increased ecosystem N leaching and gaseous N losses from soils. Our findings underscore the vulnerability of soil N stocks in permafrost regions to ongoing warming, and suggest that the potential permafrost–climate feedback may be stronger than previously anticipated.