Changes in global terrestrial ecosystem water use efficiency are closely related to soil moisture
文献类型：期刊论文
| 作者 | Liu, Xianfeng; Feng, Xiaoming; Fu, Bojie
|
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2020 |
| 卷号 | 698页码:1-13 |
| 关键词 | Gross primary productivity Evapotranspiration Process-based model Soil moisture Leaf area index Vapor pressure deficit |
| ISSN号 | 0048-9697 |
| 英文摘要 | Ecosystem water use efficiency (WUE), defined as the ratio between gross primary productivity (GPP) and evapotranspiration (ET), is an indicator of the tradeoff between carbon assimilation and water loss that is controlled by climate and ecosystem structure. However, how GPP and ET impact WUE remains poorly understood. In this study, we provide a global analysis of WUE trends front 1982 to 2011 using multi-model ensemble mean WUE values derived from seven process-based carbon cycle models and investigate the relative effects of leaf area index (LAI), soil moisture (5M), and vapor pressure deficit (VPD) on GPP and ET. Increasing WUE trend was derived for all models, with an average rate of 0.0057 +/- 0.0018 g C.kg(-1)H(2)O.yr(-1) (p = 0.00), with a spatially increasing WUE across -84% of the global land area, and increasing trends which are statistically significant over similar to 72% (p < 0.05). Spatially, GPP primarily dominated WUE variability in humid regions, i.e., boreal Eurasia, eastern America, and the tropics, whereas ET dominated WUE variability in dryland regions, i.e., northeast China, the Middle East, southern South America, and South Australia. Soil moisture is likely the most influential factor on GPP and ET variations, with similar to 63% and similar to 61% of the global land area dominated by SM, and therefore WUE, for GPP and ET respectively from 1982 to 2011. Our findings enrich the understanding of WUE trends and provide direct evidence for SM-induced variability in WUE. (C) 2019 Elsevier B.V. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44233]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Liu, Xianfeng,Feng, Xiaoming,Fu, Bojie. Changes in global terrestrial ecosystem water use efficiency are closely related to soil moisture[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,698:1-13. |
| APA | Liu, Xianfeng,Feng, Xiaoming,&Fu, Bojie.(2020).Changes in global terrestrial ecosystem water use efficiency are closely related to soil moisture.SCIENCE OF THE TOTAL ENVIRONMENT,698,1-13. |
| MLA | Liu, Xianfeng,et al."Changes in global terrestrial ecosystem water use efficiency are closely related to soil moisture".SCIENCE OF THE TOTAL ENVIRONMENT 698(2020):1-13. |
入库方式： OAI收割
来源：生态环境研究中心
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