Divergent responses of ecosystem water-use efficiency to extreme seasonal droughts in Southwest China
文献类型：期刊论文
| 作者 | Wang, Min3,4; Ding, Zhi3,4; Wu, Chaoyang1; Song, Lisheng3,4; Ma, Mingguo3,4; Yu, Pujia3,4; Lu, Bingqing5; Tang, Xuguang2,3,4 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2021-03-15 |
| 卷号 | 760页码:14 |
| 关键词 | Water use efficiency Drought event Southwest China Karst |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2020.143427 |
| 通讯作者 | Tang, Xuguang(xgtang@swu.edu.cn) |
| 英文摘要 | The recurrent drought extremes have resulted in deleterious impacts on ecological security. Despite that many attempts have been made to explore ecosystem responses to different severities of droughts, a deep understanding of how ecosystem water-use efficiency (WUE) responds to extreme seasonal droughts is critical for predicting the trends under future climate change, especially in the ecologically-fragile karst ecosystem across Southwest China. This study systematically examined the spatio-temporal variations of ecosystem WUE over the karst and non-karst areas, as well as their divergent responses to different seasonal droughts. Our findings revealed the apparent increase in drought frequency, duration, and severity in Southwest China during the past four decades. Meanwhile, spring and summer drought events were the prevailing drought types. Compared with the non-karst area, multi-year mean WUE in the karst area was relatively lower, whereas the area exhibiting significant increase in WUE (p < 0.01) accounted for 39.3% and 22.3%, respectively. However, the effects of drought on ecosystem WUE varied in different seasons with more severe consequence in the karst ecosystem. During the early stage of autumn-spring drought in 2009/2010, ecosystem WUE was apparently larger than the baseline condition with the difference turning to be negative anomalies during the peak period, whereas the effect of summer drought in 2011 led to negative anomalies nearly throughout the duration. Further analysis revealed that the anomalies in evapotranspiration acted a prominent role in altering WUE at the onset of both droughts, while ecosystem WUE was mainly determined by the sensitivity of gross primary production during the later stage. All analyses are beneficial for expecting the coupling relationship between global carbon and water cycles to future climate change, particularly as droughts are projected to increase in terms of frequency and severity. (C) 2020 Elsevier B.V. All rights reserved. |
| 资助项目 | National Natural Science Foundation of China[41830648] ; National Natural Science Foundation of China[41701212] ; Chongqing Basic and Frontier Research Project[cstc2018jcyjAX0056] ; Graduate Scientific Research and Innovation Foundation of Chongqing[CYS19074] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000607779400088 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/12760]  |
| 专题 | 中国科学院重庆绿色智能技术研究院 |
| 通讯作者 | Tang, Xuguang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China 3.Southwest Univ, Minist Educ, Sch Geog Sci, Chongqing Jinfo Mt Field Sci Observat & Res Stn K, Chongqing 400715, Peoples R China 4.Southwest Univ, State Cultivat Base Ecoagr Southwest Mt Land, Chongqing 400715, Peoples R China 5.Chongqing Geol & Mineral Explorat Bur, Nanjiang Hydrogeol & Engn Geol Brigade, Chongqing 401121, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Min,Ding, Zhi,Wu, Chaoyang,et al. Divergent responses of ecosystem water-use efficiency to extreme seasonal droughts in Southwest China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,760:14. |
| APA | Wang, Min.,Ding, Zhi.,Wu, Chaoyang.,Song, Lisheng.,Ma, Mingguo.,...&Tang, Xuguang.(2021).Divergent responses of ecosystem water-use efficiency to extreme seasonal droughts in Southwest China.SCIENCE OF THE TOTAL ENVIRONMENT,760,14. |
| MLA | Wang, Min,et al."Divergent responses of ecosystem water-use efficiency to extreme seasonal droughts in Southwest China".SCIENCE OF THE TOTAL ENVIRONMENT 760(2021):14. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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