Divergent impacts of VPD and SWC on ecosystem carbon-water coupling under different dryness conditions
文献类型：期刊论文
| 作者 | Zheng, Chen7; Wang, Shaoqiang6,7; Chen, Jinghua7; Xiang, Ning7; Sun, Leigang2,3; Chen, Bin7; Fu, Zheng5; Zhu, Kai7; He, Xinlei4 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2023-12-20 |
| 卷号 | 905页码:167007 |
| 关键词 | Sensitivity of WUE to VPD Sensitivity of WUE to SWC Humid sites Arid sites |
| DOI | 10.1016/j.scitotenv.2023.167007 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Ecosystem water use efficiency (WUE) is an indicator of carbon-water interactions and is defined as the ratio of gross primary productivity (GPP) to evapotranspiration (ET). However, it is currently unclear how WUE responds to atmospheric and soil drought events in terrestrial ecosystems with different dryness conditions. Additionally, the contributions of GPP and ET to the WUE response remain poorly understood. Based on measurements from 26 flux tower sites distributed worldwide, the binning method and random forest model were employed to separate the sensitivities of daily ecosystem WUE, GPP, and ET to vapor pressure deficit (VPD) and soil water content (SWC) under different dryness conditions (dryness index = potential evapotranspiration/precipitation, DI). Results showed that the sensitivity of WUE to VPD was negative at humid sites (DI < 1), while the sensitivity of WUE to SWC was positive at arid sites (DI > 2). Furthermore, the contribution of GPP to VPD-induced WUE variability was 63 % at humid sites, and the contribution of ET to SWC-induced WUE variability was 68 % when SWC was less than the 60th percentile at arid sites. Consequently, one increasing VPD-induced decrease in GPP was generally linked to a decrease in WUE at humid sites, and one drying soil moisture-caused decrease in ET was linked to a WUE increase under low SWC conditions at arid sites. Finally, VPD had a stronger effect on WUE than SWC when VPD was less than the 90th percentile or SWC was greater than the 50th percentile. Our findings underscore the importance of considering ecosystem dryness when investigating the impacts of VPD and SWC on ecosystem carbon-water coupling. |
| WOS关键词 | USE EFFICIENCY ; CLIMATE-CHANGE ; ATMOSPHERIC DEMAND ; FOREST ECOSYSTEMS ; SOIL RESPIRATION ; HEAT-FLUX ; DROUGHT ; PRODUCTIVITY ; EVAPORATION ; EXCHANGE |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS记录号 | WOS:001092682300001 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/199436]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Hebei Technol Innovat Ctr Geog Informat Applicat, Shijiazhuang 050011, Peoples R China 2.Hebei Acad Sci, Inst Geog Sci, Shijiazhuang 050011, Peoples R China 3.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China 4.Univ Paris Saclay, CEA CNRS UVSQ, LSCE IPSL, Lab Sci Climat & Environm, F-91198 Gif Sur Yvette, France 5.Chinese Univ Geosci, Sch Geog & Informat Engn, Key Lab Reg Ecol Proc & Environm Evolut, Wuhan 430074, Peoples R China 6.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 7.Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Chen,Wang, Shaoqiang,Chen, Jinghua,et al. Divergent impacts of VPD and SWC on ecosystem carbon-water coupling under different dryness conditions[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,905:167007. |
| APA | Zheng, Chen.,Wang, Shaoqiang.,Chen, Jinghua.,Xiang, Ning.,Sun, Leigang.,...&He, Xinlei.(2023).Divergent impacts of VPD and SWC on ecosystem carbon-water coupling under different dryness conditions.SCIENCE OF THE TOTAL ENVIRONMENT,905,167007. |
| MLA | Zheng, Chen,et al."Divergent impacts of VPD and SWC on ecosystem carbon-water coupling under different dryness conditions".SCIENCE OF THE TOTAL ENVIRONMENT 905(2023):167007. |
入库方式： OAI收割
来源：地理科学与资源研究所
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