干旱区生态环境知识资源中心(Arid): Water use efficiency of China's karst ecosystems: The effect of different ecohydrological and climatic factors

Arid

DOI	10.1016/j.scitotenv.2023.167069
	Water use efficiency of China's karst ecosystems: The effect of different ecohydrological and climatic factors
	Zhou, Xu; Ao, Yang; Jiang, Xiao; Yang, Shengtian; Hu, Yuxue; Wang, Xiaohua; Zhang, Ji
通讯作者	Zhou, X
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2023
卷号	905
英文摘要	Water use efficiency (WUE) is an important indicator for understanding the coupled ecosystem carbon and water cycles. However, the effect and contributions of factors on WUE variations in China's karst ecosystems for different climatic conditions have not been extensively studied. Our studies on WUE variations of China's karst ecosystems from 2001 to 2021 based on evapotranspiration and net primary productivity (NPP) from Moderateresolution imaging spectroradiometer revealed the contributions of soil moisture (SM), leaf area index (LAI), precipitation (P), temperature (T), vapor pressure deficit (VPD), and CO2 concentration (CO2). Results showed that the trend of WUE was similar to that of NPP in terms of the latitude, longitude, and elevation, and WUE started abruptly decreasing after an elevation >3000 m until it reached 0 at 4500 m. WUE was primarily slightly increased in the humid region (H) and slightly decreased in the semi-humid region (SH), arid and semi-arid regions (ASA), and Qinghai-Tibet plateau region (QTP). CO2 (0.34), LAI (0.60), P (0.58), and LAI (0.55) exhibited the strongest positive direct effects on WUE in H, SH, ASA, and QTP, while VPD exhibited the strongest negative direct effect. VPD (0.26), VPD (0.28), SM (0.47), and P (0.39) had the strongest positive indirect effect, while T (-0.24), T (-0.18), VPD (-0.35), and P (-0.03) had the strongest negative indirect effect on WUE. The positive contributions of WUE variations in H, SH, ASA, and QTP were dominated by T (47.96 %), CO2 (26.36 %), P (8.81 %), and CO2 (52.97 %), whereas the negative contributions were dominated by P (-7.95 %), LAI (-26.57 %), CO2 (-35.98 %), and VPD (-9.59 %), respectively. This study quantifies the spatial and temporal distribution patterns of WUE in China's karst ecosystems and the regional differences between the multiple ecohydrological factors, thereby facilitating in-depth understanding and effective regulation for the carbon and water cycles in karst ecosystems.
英文关键词	Water use efficiency Ecohydrological factors Different climatic conditions Path analysis Elasticity coefficient analysis Karst ecosystem
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001083900900001
WOS关键词	NET PRIMARY PRODUCTION ; TERRESTRIAL ECOSYSTEMS ; VEGETATION ; REGION ; DRIVERS ; IMPACT ; AREA ; LEAF
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398566
推荐引用方式 GB/T 7714	Zhou, Xu,Ao, Yang,Jiang, Xiao,et al. Water use efficiency of China's karst ecosystems: The effect of different ecohydrological and climatic factors[J],2023,905.
APA	Zhou, Xu.,Ao, Yang.,Jiang, Xiao.,Yang, Shengtian.,Hu, Yuxue.,...&Zhang, Ji.(2023).Water use efficiency of China's karst ecosystems: The effect of different ecohydrological and climatic factors.SCIENCE OF THE TOTAL ENVIRONMENT,905.
MLA	Zhou, Xu,et al."Water use efficiency of China's karst ecosystems: The effect of different ecohydrological and climatic factors".SCIENCE OF THE TOTAL ENVIRONMENT 905(2023).