干旱区生态环境知识资源中心(Arid): Variation and attribution of water use efficiency in sunflower and maize fields in an irrigated semi-arid area

Arid

DOI	10.1002/hyp.14080
	Variation and attribution of water use efficiency in sunflower and maize fields in an irrigated semi-arid area
	Wang, Weishu; Wang, Xingwang; Huo, Zailin; Rong, Yao; Huang, Quanzhong; Huang, Guanhua
通讯作者	Huo, ZL (corresponding author), China Agr Univ, Ctr Agr Water Res China, 17 Qinghua East Rd, Beijing 100083, Peoples R China.
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2021
卷号	35 期号:3
英文摘要	Water use efficiency (WUE) links carbon and water exchanges between farmlands and the atmosphere. Understanding the variation and attribution of WUE is essential to reveal the physiological and ecological adaptation mechanisms of crops to the changing environment, and to better allocate, regulate and conserve water resources. However, few studies on the variation and attribution of WUE have been conducted in irrigated arid or semi-arid farmlands. Therefore, in this study, water and carbon fluxes were measured using eddy covariance systems in two farmlands (one sunflower field and one maize field) in a semi-arid irrigation district in China. It was found that the average WUE of sunflower during its full growth period was 1.72 g C kg(-1) H2O, much lower than that of maize (4.07 g C kg(-1) H2O). At each growth stage, the WUE of both crops were negatively correlated with vapour pressure deficit (VPD), net radiation (R-n) and soil water content (SWC). The negative correlations could be attributed to the arid meteorological condition and the relatively abundant soil moisture due to irrigation and shallow groundwater levels. VPD was the main factor affecting WUE, followed by R-n and SWC. It was also found that the response of WUE to crop leaf area index (LAI) and to canopy conductance (g(c)) depended on the VPD ranges: when VPD increased, the response of WUE to LAI and to g(c) decreased. Our findings could improve the understanding of the coupling effect of water and carbon fluxes over farmland ecosystems in arid and semi-arid irrigation areas and help improve agricultural production and save water resources in such areas.
英文关键词	eddy covariance irrigated farmland meteorological condition soil moisture water use efficiency
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000636346700001
WOS类目	Water Resources
WOS研究方向	Water Resources
来源机构	中国农业大学 ; 清华大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350504
作者单位	[Wang, Weishu; Wang, Xingwang; Huo, Zailin; Rong, Yao; Huang, Quanzhong; Huang, Guanhua] China Agr Univ, Ctr Agr Water Res China, 17 Qinghua East Rd, Beijing 100083, Peoples R China; [Wang, Xingwang] Tsinghua Univ, Dept Hydraul Engn, Beijing, Peoples R China; [Huang, Quanzhong; Huang, Guanhua] China Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Weishu,Wang, Xingwang,Huo, Zailin,et al. Variation and attribution of water use efficiency in sunflower and maize fields in an irrigated semi-arid area[J]. 中国农业大学, 清华大学,2021,35(3).
APA	Wang, Weishu,Wang, Xingwang,Huo, Zailin,Rong, Yao,Huang, Quanzhong,&Huang, Guanhua.(2021).Variation and attribution of water use efficiency in sunflower and maize fields in an irrigated semi-arid area.HYDROLOGICAL PROCESSES,35(3).
MLA	Wang, Weishu,et al."Variation and attribution of water use efficiency in sunflower and maize fields in an irrigated semi-arid area".HYDROLOGICAL PROCESSES 35.3(2021).