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Decadal extreme drought reduces alpine subsoil carbon stocks

文献类型：期刊论文

作者Zhou, Ronglei4,5,6; Wang, Jinsong4,5,6; Wang, Quancheng6; Liu, Ning6; Ye, Chenglong3; Shi, Jingjing2; Liu, Mengjie6; Gao, Zhangwei1; Chu, Houkun6; Zhang, Zhenrui6
刊名PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
出版日期2026-02-24
卷号123期号:8页码:e2517468123
关键词extreme drought SOC stocks mineral-associated organic C subsoil
ISSN号0027-8424
DOI10.1073/pnas.2517468123
产权排序1
文献子类Article
英文摘要Grassland soil organic carbon (SOC) stocks are increasingly vulnerable to intensified drought. Yet, how long-term, especially extreme, drought affects these C reserves across soil profiles remains unresolved. Here, we present the response of SOC stocks at various depths (0 to 60 cm) using an experiment involving a 10-year drought gradient (P, 1/2 P, 1/4 P, and 1/12 P, where P is ambient precipitation) in an alpine grassland. We found that extreme drought (1/12 P) caused significant SOC losses in the subsoil, whereas mild to moderate droughts had no significant effects on SOC at any depth. Under extreme drought, SOC stocks declined by 27% in the 20 to 30 cm layer and by 37% in the 30 to 40 cm layer, while no significant changes were observed in the topsoil (0 to 20 cm) and the deeper layer (40 to 60 cm). Subsoil C losses were primarily driven by reductions in mineral-associated organic C (MAOC) rather than particulate organic C. Multiyear extreme drought disrupted soil-microbe-mineral interactions, as indicated by reductions in soil nitrogen availability, microbial biomass, carbon use efficiency, and mineral-binding agents. These changes collectively undermined the formation and stabilization of MAOC. Our findings suggest that prolonged extreme drought can weaken subsoil C storage and stability, highlighting the need to incorporate subsoil processes into Earth System Models to better predict soil C-climate feedback under future drought scenarios.
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WOS关键词GRASSLAND SOIL CARBON ; ORGANIC-MATTER ; MICROBIAL BIOMASS ; PLANT BIOMASS ; ECOSYSTEMS ; RESPONSES ; PRECIPITATION ; PRESERVATION ; ALLOCATION ; STABILITY
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:001727689400001
出版者NATL ACAD SCIENCES
源URL[http://ir.igsnrr.ac.cn/handle/311030/221595]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Wang, Jinsong; Niu, Shuli
作者单位1.Fujian Agr & Forestry Univ, Coll Juncao Sci & Ecol, Fuzhou 350000, Peoples R China
2.Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China;
3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China;
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Sichuan Zoige Alpine Wetland Ecosyst Natl Observat, Beijing 100101, Peoples R China;
5.Univ Chinese Acad Sci, Dept Environm & Resources, Beijing 100049, Peoples R China;
6.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China;
推荐引用方式
GB/T 7714		 Zhou, Ronglei,Wang, Jinsong,Wang, Quancheng,et al. Decadal extreme drought reduces alpine subsoil carbon stocks[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2026,123(8):e2517468123.
APA Zhou, Ronglei.,Wang, Jinsong.,Wang, Quancheng.,Liu, Ning.,Ye, Chenglong.,...&Niu, Shuli.(2026).Decadal extreme drought reduces alpine subsoil carbon stocks.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,123(8),e2517468123.
MLA Zhou, Ronglei,et al."Decadal extreme drought reduces alpine subsoil carbon stocks".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 123.8(2026):e2517468123.

入库方式： OAI收割

来源：地理科学与资源研究所

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