Temporal dynamics of ecosystem, inherent, and underlying water use efficiencies of forests, grasslands, and croplands and their responses to climate change

文献类型： 外文期刊

第一作者： Chen, Wei

作者： Chen, Wei;Liu, Shuguang;Zhu, Yu;Feng, Shuailong;Wang, Zhao;Yan, Wende;Chen, Wei;Liu, Shuguang;Zhu, Yu;Feng, Shuailong;Wang, Zhao;Yan, Wende;Zhao, Shuqing;Wu, Yiping;Xiao, Jingfeng;Yuan, Wenping;Chen, Wei;Ju, Hui;Wang, Qinyi

作者机构：

关键词： Ecosystem level; Water use efficiency; FLUXNET; Changing trend; Driving factors

期刊名称：CARBON BALANCE AND MANAGEMENT （ 影响因子：3.8； 五年影响因子：5.4 ）

ISSN： 1750-0680

年卷期： 2023 年 18 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundUnderstanding temporal trends and varying responses of water use efficiency (WUE) to environmental changes of diverse ecosystems is key to predicting vegetation growth. WUE dynamics of major ecosystem types (e.g., forest, grassland and cropland) have been studied using various WUE definitions/metrics, but a comparative study on WUE dynamics and their driving forces among different ecosystem types using multiple WUE metrics is lacking. We used eddy covariance measurements for 42 FLUXNET2015 sites (396 site years) from 1997 to 2014, as well as three commonly used WUE metrics (i.e., ecosystem, inherent, and underlying WUE) to investigate the commonalities and differences in WUE trends and driving factors among deciduous broadleaf forests (DBFs), evergreen needleleaf forests (ENFs), grasslands, and croplands.ResultsOur results showed that the temporal trends of WUE were not statistically significant at 73.8% of the forest, grassland and cropland sites, and none of the three WUE metrics exhibited better performance than the others in quantifying WUE. Meanwhile, the trends observed for the three WUE metrics were not significantly different among forest, grassland and cropland ecosystems. In addition, WUE was mainly driven by atmospheric carbon dioxide concentration at sites with significant WUE trends, and by vapor pressure deficit (VPD) at sites without significant trends (except cropland).ConclusionsOur findings revealed the commonalities and differences in the application of three WUE metrics in disparate ecosystems, and further highlighted the important effect of VPD on WUE change.

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