2025-10-18 中国科学院 (CAS)
Conceptual diagram showing the accelerated soil P cycling upon abrupt permafrost thaw (Image by LI Ziliang)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/life/202510/t20251023_1094731.shtml
- https://www.nature.com/articles/s41558-025-02445-4
永久凍土の急激な融解による土壌リン循環の加速 Accelerated soil phosphorus cycling upon abrupt permafrost thaw
Ziliang Li,Luyao Kang,Lu Wang,Wolfgang Wanek,Dianye Zhang,Guanqin Wang,Hans Lambers,Josep Peñuelas,Mingkai Jiang & Yuanhe Yang
Nature Climate change Published:17 October 2025
DOI:https://doi.org/10.1038/s41558-025-02445-4
Abstract
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.
