Threshold response of ecosystem water use efficiency to soil water in an alpine meadow
文献类型：期刊论文
| 作者 | Li, Tingting1,2; Tian, Dashuan1,2; He, Yicheng3; Zhang, Ruiyang2; Wang, Jinsong2; Wang, Furong1,2; Niu, Shuli1,2 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2024-01-15 |
| 卷号 | 908页码:9 |
| ISSN号 | 0048-9697 |
| 关键词 | Ecosystem water use efficiency Water threshold Gross ecosystem productivity Evapotranspiration Transpiration Alpine meadow |
| DOI | 10.1016/j.scitotenv.2023.168345 |
| 通讯作者 | Tian, Dashuan(tiands@igsnrr.ac.cn) |
| 英文摘要 | Ecosystem water use efficiency (WUE) is a coupled index of carbon (gross ecosystem productivity, GEP) and water fluxes (transpiration, Tr or evapotranspiration, ET), reflecting how ecosystem uses water efficiently to increase its carbon uptake. Though ecosystem WUE is generally considered to decrease with increasing pre-cipitation levels, it remains elusive whether and how it nonlinearly responds to extreme water changes. Here, we performed a 5-year precipitation halving experiment in an alpine meadow, combined with extremely interannual precipitation fluctuations, to create a large range of soil water variations. Our results showed that WUETr and WUEET consistently showed a quadratic pattern in response to soil water. Such quadratic patterns were steadily held at different stages of growing seasons, with minor changes in the optimal water thresholds (25.0-28.4 %). Below the water threshold, more soil water stimulated GEP but reduced Tr and ET by lowering soil temperature, resulting in a positive response of ecosystem WUE to soil water. Above the threshold, soil water stimulated GEP less than Tr (ET), leading to a negative response of ecosystem WUE to soil water. However, biological processes, including plant cover and belowground biomass as well as vertical root biomass distribution, had less effect on ecosystem WUE. Overall, this work is among the first to reveal the nonlinearity and optimal water thresholds of ecosystem WUE across a broad range of soil water, suggesting that future extreme precipitation events will more frequently surpass the water threshold and differently change the coupling relationships of carbon and water fluxes in alpine grasslands. |
| WOS关键词 | PRECIPITATION GRADIENT ; GRASSLAND ECOSYSTEMS ; DROUGHT ; UNDERSTOREY ; FOREST ; CARBON ; ROOTS ; CHINA ; CO2 |
| 资助项目 | National Key Research and Development Program of China[2022YFF0802102] ; Natural Science Foundation of China[32271636] ; Natural Science Foundation of China[2020RC003] ; Youth Innovation Promotion Association[2021050] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001112181600001 |
| 资助机构 | National Key Research and Development Program of China ; Natural Science Foundation of China ; Youth Innovation Promotion Association |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/200326]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Tian, Dashuan |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 3.China Agr Univ, Coll Grassland Sci & Technol, Beijing 100193, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Tingting,Tian, Dashuan,He, Yicheng,et al. Threshold response of ecosystem water use efficiency to soil water in an alpine meadow[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,908:9. |
| APA | Li, Tingting.,Tian, Dashuan.,He, Yicheng.,Zhang, Ruiyang.,Wang, Jinsong.,...&Niu, Shuli.(2024).Threshold response of ecosystem water use efficiency to soil water in an alpine meadow.SCIENCE OF THE TOTAL ENVIRONMENT,908,9. |
| MLA | Li, Tingting,et al."Threshold response of ecosystem water use efficiency to soil water in an alpine meadow".SCIENCE OF THE TOTAL ENVIRONMENT 908(2024):9. |
入库方式： OAI收割
来源：地理科学与资源研究所
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