{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T20:09:08Z","timestamp":1775678948899,"version":"3.50.1"},"reference-count":67,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2022,8,31]],"date-time":"2022-08-31T00:00:00Z","timestamp":1661904000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["U19A2051"],"award-info":[{"award-number":["U19A2051"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Ecosystem water use efficiency (WUE) plays an important role in maintaining the carbon assimilation\u2013water transpiration balance in ecosystems. However, spatiotemporal changes in WUE in the subtropical region of China (STC) and the impact of driving forces remain unclear. In this study, we analyzed the spatiotemporal variation in WUE in the STC and used ridge regression combined with path analysis to identify direct and indirect effects of climate change, vegetation growth, and elevated atmospheric CO2 concentration (Ca) on the interannual trend in WUE. We then quantified the actual and relative contributions of these drivers to WUE change based on the sensitivity of these variables on WUE and the trends of the variables themselves. Results reveal a mean WUE of 1.57 g C\/m2\/mm in the STC. The annual WUE series showed a descending trend with a decline rate of 0.0006 g C\/m2\/mm\/year. The annual average temperature (MAT) and leaf area index (LAI) had strong positive direct effects on the WUE, while the vapor pressure deficit (VPD) had a strong negative direct effect. Opposite direct and indirect effects offset each other, but overall there was a total positive effect of Ca and VPD on WUE. In terms of actual contribution, LAI, Ca, and VPD were the main driving factors; LAI caused WUE to increase by 0.0026 g C\/m2\/mm\/year, while Ca and VPD caused WUE to decrease by 0.0021 and 0.0012 g C\/m2\/mm\/year, respectively. In terms of relative contribution, LAI dominated the WUE trend, although Ca and VPD were also important factors. Other drivers contributed less to the WUE trend. The results of this study have implications for ecological management and restoration under environmental climate change conditions in subtropical regions worldwide.<\/jats:p>","DOI":"10.3390\/rs14174296","type":"journal-article","created":{"date-parts":[[2022,9,1]],"date-time":"2022-09-01T03:55:38Z","timestamp":1662004538000},"page":"4296","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Contributions of Climate Change, Vegetation Growth, and Elevated Atmospheric CO2 Concentration to Variation in Water Use Efficiency in Subtropical China"],"prefix":"10.3390","volume":"14","author":[{"given":"Jianyong","family":"Xiao","sequence":"first","affiliation":[{"name":"School of Geographic Sciences, Hunan Normal University, Changsha 410081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8083-8556","authenticated-orcid":false,"given":"Binggeng","family":"Xie","sequence":"additional","affiliation":[{"name":"School of Geographic Sciences, Hunan Normal University, Changsha 410081, China"}]},{"given":"Kaichun","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Geographic Sciences, Hunan Normal University, Changsha 410081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5981-6475","authenticated-orcid":false,"given":"Junhan","family":"Li","sequence":"additional","affiliation":[{"name":"School of Geographic Sciences, Hunan Normal University, Changsha 410081, China"}]},{"given":"Jing","family":"Xie","sequence":"additional","affiliation":[{"name":"School of Geographic Sciences, Hunan Normal University, Changsha 410081, China"}]},{"given":"Chao","family":"Liang","sequence":"additional","affiliation":[{"name":"School of Geographic Sciences, Hunan Normal University, Changsha 410081, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"280","DOI":"10.1016\/j.colsurfb.2007.10.023","article-title":"Investigation on the relationship between leaf water use efficiency and physio-biochemical traits of winter wheat under rained condition","volume":"62","author":"Baodi","year":"2008","journal-title":"Colloids Surf. 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