干旱区生态环境知识资源中心(Arid): Revisiting the role of transpiration in the variation of ecosystem water use efficiency in China

Arid

DOI	10.1016/j.agrformet.2023.109344
	Revisiting the role of transpiration in the variation of ecosystem water use efficiency in China
	Sun, Huaiwei; Lu, Mengge; Yang, Yong; Chen, Jianing; Wang, Jingfeng; Yan, Dong; Xue, Jie; Zhang, Wenxin
通讯作者	Lu, MG
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2023
卷号	332
英文摘要	Efforts to develop effective climate strategies necessitate a better understanding of the relationship between terrestrial water and carbon cycles. Water use efficiency (WUE) has been often used to characterize this rela-tionship, while the role of transpiration (T) in the variation of ecosystem WUE has been less investigated. Here, we partitioned WUEET (the ratio of gross primary productivity (GPP) to evapotranspiration (ET)) into a two-component process, i.e., the ratio of gross primary productivity to plant transpiration, GPP/T, that is WUET, and the ratio of plant transpiration to evapotranspiration, T/ET. Based on two GPP datasets (i.e., GPP based on the light use efficiency model or the vegetation index-NIRv) and the GLEAM ET dataset, this study investigated the role of T in the variation of WUE in the ecosystem level and how the role is affected by drought. We found that drought can lead to the change of ET partitioning, thus affecting the variability of WUE. The variability of WUEET was dominated by WUET. In general, the proportion of T increased gradually from humid to arid areas. To adapt to drought conditions, vegetation in arid areas tend to have a high stress resistance by increasing their WUE. We further found that WUET has stronger seasonal stability than WUEET. GPP dominated WUEET variability in humid/sub humid areas, while ET and GPP jointly dominated WUEET variability in semi-arid/arid areas. GPP dataset based on light use efficiency (LUE) could better reflect the impact of drought on vegetation. This study contributes to a better understanding of the change mechanism of ecosystem WUE and emphasizes the critical role of physiological process components in water-carbon cycling.
英文关键词	Water use efficiency Water and carbon coupling Water availability Evapotranspiration partition Gross primarily productivity
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000946133500001
WOS关键词	GROSS PRIMARY PRODUCTIVITY ; TERRESTRIAL ECOSYSTEMS ; SPATIAL VARIABILITY ; CLIMATE EXTREMES ; SOLAR-RADIATION ; CARBON ; DROUGHT ; VEGETATION ; CO2 ; CONDUCTANCE
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395000
推荐引用方式 GB/T 7714	Sun, Huaiwei,Lu, Mengge,Yang, Yong,et al. Revisiting the role of transpiration in the variation of ecosystem water use efficiency in China[J],2023,332.
APA	Sun, Huaiwei.,Lu, Mengge.,Yang, Yong.,Chen, Jianing.,Wang, Jingfeng.,...&Zhang, Wenxin.(2023).Revisiting the role of transpiration in the variation of ecosystem water use efficiency in China.AGRICULTURAL AND FOREST METEOROLOGY,332.
MLA	Sun, Huaiwei,et al."Revisiting the role of transpiration in the variation of ecosystem water use efficiency in China".AGRICULTURAL AND FOREST METEOROLOGY 332(2023).