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<p>Permafrost thaw can stimulate soil carbon release, triggering a positive carbon–climate feedback, which may be mediated by changes in soil phosphorus (P) availability. However, the response of soil P cycling to permafrost thaw and the potential biotic and abiotic mechanisms involved are largely unknown. We investigate how soil P cycling responds to abrupt permafrost thaw based on large-scale sampling along a permafrost transect on the Tibetan Plateau, combined with <sup>31</sup>P-nuclear magnetic resonance spectroscopy, <sup>33</sup>P-labelling and metagenomic sequencing. In collapsed areas, gross phosphate (P<sub>i</sub>) mobilization in the topsoil (0–15 cm) is 50% faster compared with non-collapsed landforms, linked to a higher abundance of microbial P-cycling genes. Meanwhile, plant P uptake increases by 71% due to the enhanced gross P<sub>i</sub> mobilization, improved plant P-acquisition capabilities and reduced microbial competition with plants upon permafrost collapse. These findings demonstrate that abrupt permafrost thaw accelerates soil P cycling, which could then mediate the permafrost carbon–climate feedback.</p>

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Accelerated soil phosphorus cycling upon abrupt permafrost thaw

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Ziliang Li,
  • Luyao Kang,
  • Lu Wang,
  • Wolfgang Wanek,
  • Dianye Zhang,
  • Guanqin Wang,
  • Hans Lambers,
  • Josep Peñuelas,
  • Mingkai Jiang,
  • Yuanhe Yang

摘要

Permafrost thaw can stimulate soil carbon release, triggering a positive carbon–climate feedback, which may be mediated by changes in soil phosphorus (P) availability. However, the response of soil P cycling to permafrost thaw and the potential biotic and abiotic mechanisms involved are largely unknown. We investigate how soil P cycling responds to abrupt permafrost thaw based on large-scale sampling along a permafrost transect on the Tibetan Plateau, combined with 31P-nuclear magnetic resonance spectroscopy, 33P-labelling and metagenomic sequencing. In collapsed areas, gross phosphate (Pi) mobilization in the topsoil (0–15 cm) is 50% faster compared with non-collapsed landforms, linked to a higher abundance of microbial P-cycling genes. Meanwhile, plant P uptake increases by 71% due to the enhanced gross Pi mobilization, improved plant P-acquisition capabilities and reduced microbial competition with plants upon permafrost collapse. These findings demonstrate that abrupt permafrost thaw accelerates soil P cycling, which could then mediate the permafrost carbon–climate feedback.