干旱区生态环境知识资源中心(Arid): Surface soil water content dominates the difference between ecosystem and canopy water use efficiency in a sparse vineyard

Arid

DOI	10.1016/j.agwat.2019.105817
	Surface soil water content dominates the difference between ecosystem and canopy water use efficiency in a sparse vineyard
	Gao, Lei; Zhao, Peng; Kang, Shaozhong; Li, Sien; Tong, Ling; Ding, Risheng; Lu, Hongna
通讯作者	Kang, SZ (corresponding author), China Agr Univ, Ctr Agr Water Res China, 17 Qinghua East Rd, Beijing 10083, Peoples R China.
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2019
卷号	226
英文摘要	Water use efficiency (WUE) is an important eco-physiological index that reflects the relationship between ecosystem water and carbon cycles. Investigating the ecosystem WUE contributes to a better understanding of the water-carbon coupling mechanism in ecosystems. We explored the responses of the daily ecosystem WUE (WUEe) and canopy WUE (WUEc) to several influential factors, the dominant biophysical factor and the dominant water/carbon flux component of the difference between WUEe and WUEc based on continuous measurements collected via an eddy covariance system, sap flow system, and microlysimeters over two growing seasons from 2017 to 2018 in a sparse vineyard in northwestern China. The results showed that the seasonal averages for WUEe and WUEc were 0.52 g C kg H2O-1 and 1.96 g C kg H2O-1, respectively. WUEe and WUEc responded weakly to the air temperature (Ta) and showed a negative linear correlation to the photosynthetic active radiation (PAR) and vapor pressure deficit (VPD). WUEe decreased significantly with the rising soil water content (SWC) while WUEc showed a weak response. Both WUEe and WUEc exhibited positive linear relationships with the leaf area index (LAI). The results from a structural equation model (SEM) indicated that among the biophysical controllers, SWC and LAI were the top two controlling factors on the difference between WUEe and WUEc, and SWC played a dominant role. The difference between WUEe and WUEc increased with the rising SWC and decreased with the rising LAI. Among the flux components, including soil evaporation (E), transpiration (T), net ecosystem productivity (NEP), and ecosystem respiration (R-eco), E dominated the discrepancy between WUEe and WUEc due to the strong control of SWC on E. This study highlights the strong control by the SWC in regulating the ecosystem WUE under a sparse canopy in an arid area.
英文关键词	Water flux Carbon flux Soil evaporation Transpiration ratio Carbon use efficiency Eddy covariance
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000525274200028
WOS关键词	CARBON USE EFFICIENCY ; GAP FILLING STRATEGIES ; EDDY-COVARIANCE ; ENVIRONMENTAL CONTROLS ; GRASSLAND ECOSYSTEMS ; 10-YEAR VARIABILITY ; CROP COEFFICIENTS ; SEVERE DROUGHT ; FOREST ; FLUX
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369738
作者单位	[Gao, Lei; Zhao, Peng; Kang, Shaozhong; Li, Sien; Tong, Ling; Ding, Risheng; Lu, Hongna] China Agr Univ, Ctr Agr Water Res China, 17 Qinghua East Rd, Beijing 10083, Peoples R China
推荐引用方式 GB/T 7714	Gao, Lei,Zhao, Peng,Kang, Shaozhong,et al. Surface soil water content dominates the difference between ecosystem and canopy water use efficiency in a sparse vineyard[J]. 中国农业大学,2019,226.
APA	Gao, Lei.,Zhao, Peng.,Kang, Shaozhong.,Li, Sien.,Tong, Ling.,...&Lu, Hongna.(2019).Surface soil water content dominates the difference between ecosystem and canopy water use efficiency in a sparse vineyard.AGRICULTURAL WATER MANAGEMENT,226.
MLA	Gao, Lei,et al."Surface soil water content dominates the difference between ecosystem and canopy water use efficiency in a sparse vineyard".AGRICULTURAL WATER MANAGEMENT 226(2019).