Compound drought-heatwave events reduce ecosystem carbon use efficiency in alpine meadow and wetland on the Tibetan plateau
文献类型：期刊论文
| 作者 | Liu, Xiao1; Zhang, Tao4; Zhao, Guang1,3; Cong, Nan1,3; Zheng, Zhoutao1,3; Duan, Xiaoqing1,3; Xu, Mingjie4; Zhang, Yangjian1,2,3 |
| 刊名 | CATENA
 |
| 出版日期 | 2026-06-01 |
| 卷号 | 267页码:110010 |
| 关键词 | CUEe Alpine ecosystems Eddy covariance Compound drought-heatwave events |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2026.110010 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Increasing climate variability has led to more frequent and intense droughts and heatwaves, yet their impacts on alpine ecosystem functioning remain poorly understood. Here, we examined how compound drought-heatwave (CDHW) events alter ecosystem carbon use efficiency (CUEe) in two alpine ecosystems-an alpine wetland and an alpine meadow-on the Qinghai-Tibetan Plateau using eddy covariance observations from 2014 to 2016. During the non-CDHW periods, the CUEe did not differ significantly between the alpine wetland and the alpine meadow. In contrast, CDHW events imposed concurrent heat and moisture stress that markedly altered both the magnitude and variability of CUEe relative to non-CDHW conditions. During the CDHW years (2015-2016), variations in Delta CUEe were driven primarily by changes in net ecosystem exchange (Delta NEE), reflecting an imbalance between photosynthesis and respiration under compound stress. CDHW events also reorganized the dominant environmental controls of CUEe in both ecosystems, with soil water content (SWC) becoming more influential than temperature. Notably, during the exceptionally intense 2015 CDHW event, CUEe declined sharply to -1.19 +/- 0.23 in the alpine meadow, indicating a temporary loss of carbon-use efficiency, whereas the alpine wetland maintained positive CUEe (0.38 +/- 0.02), indicating greater ecosystem resistance. Overall, these results reveal a threshold-like response of CUEe to CDHW intensity and a shift from temperature- to moisturedominated control, emphasizing the pivotal role of soil water in regulating the alpine carbon balance under increasing compound extremes. These insights provide a mechanistic basis for predicting future carbon-climate feedbacks in high-altitude ecosystems under future compound climate extremes. |
| URL标识 | 查看原文 |
| WOS关键词 | PRIMARY PRODUCTIVITY ; SOIL RESPIRATION ; TEMPERATURE ; EXCHANGE ; FLUX ; MODELS ; GPP |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001720762800001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221259]  |
| 专题 | 拉萨站高原生态系统研究中心_外文论文 |
| 通讯作者 | Xu, Mingjie; Zhang, Yangjian |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Naqu Alpine Grassland Ecosyst Natl Observat & Res, Beijing 100101, Peoples R China; 2.Hebei Univ, Sch Life Sci, Baoding 071002, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China; 4.Shenyang Agr Univ, Coll Agron, Shenyang 110866, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Liu, Xiao,Zhang, Tao,Zhao, Guang,et al. Compound drought-heatwave events reduce ecosystem carbon use efficiency in alpine meadow and wetland on the Tibetan plateau[J]. CATENA,2026,267:110010. |
| APA | Liu, Xiao.,Zhang, Tao.,Zhao, Guang.,Cong, Nan.,Zheng, Zhoutao.,...&Zhang, Yangjian.(2026).Compound drought-heatwave events reduce ecosystem carbon use efficiency in alpine meadow and wetland on the Tibetan plateau.CATENA,267,110010. |
| MLA | Liu, Xiao,et al."Compound drought-heatwave events reduce ecosystem carbon use efficiency in alpine meadow and wetland on the Tibetan plateau".CATENA 267(2026):110010. |
入库方式： OAI收割
来源：地理科学与资源研究所
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