干旱区生态环境知识资源中心(Arid): The controlling factors of ecosystem water use efficiency in maize fields under drip and border irrigation systems in Northwest China

Arid

DOI	10.1016/j.agwat.2022.107839
	The controlling factors of ecosystem water use efficiency in maize fields under drip and border irrigation systems in Northwest China
	Guo, Hui; Li, Sien; Kang, Shaozhong; Du, Taisheng; Liu, Wenfeng; Tong, Ling; Hao, Xinmei; Ding, Risheng
通讯作者	Li, S
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	272
英文摘要	The ecosystem water use efficiency (WUEe) is the critical link between water and carbon cycling in the terrestrial ecosystem. The evaluations of the biophysical factors influencing WUEe could reveal mechanisms of controlling WUEe. In order to save water in agriculture, drip irrigation (DI) has been promoted to replace border irrigation (BI) in northwest China. Different irrigation methods will cause differences in evapotranspiration (ETa), gross primary productivity (GPP), and WUEe. Further research is needed to quantify the contribution of each factor to the differences in ETa, GPP, and WUEe. To separate the different factors controlling ETa, GPP, and WUEe variability between DI and border BI, the 4-year data under DI and BI measured by eddy covariance systems were collected and analyzed. To explore the differences in ETa, GPP, and WUEe under different irrigation methods, Penman-Monteith (P-M) model and stomatal conductance-photosynthetic transpiration coupling (SMPT-SB) model complemented by perturbation analysis were employed. The results showed that the 4-year mean evapotranspiration (ETa) decreased by 8% under DI compared with the value under BI, and the mean gross primary productivity (GPP) under DI was 5% higher than the BI. The WUEe under DI was 14% higher than that under BI. The P-M model and the SMPT-SB model agreed well with ETa and GPP measured on daily time scales, providing confidence in their ability to separate the biological and physical controls of ETa, GPP, and WUEe. Based on the two models, the first-order Taylor series expansions of the total ETa, GPP, and WUEe derivatives were applied to the P-M model and SMPT-SB model and compared with measured differences in ETa, GPP, and WUEe. More than 60% of the difference in ETa caused by the two irrigation methods was attributed to variations in the coupled surface resistance, and drip irrigation mainly achieves water saving by reducing soil evaporation. The difference in maize growth due to irrigation methods was the main reason for the differences in GPP. The differences in vapor pressure deficit and the coupled surface resistance caused by irrigation methods were the main factors causing the difference in WUEe. It could be surmised that drip irrigation increased WUEe in maize fields by changing surface resistance, which mainly reduced soil evaporation.
英文关键词	Evapotranspiration Gross primary productivity Water use efficiency Irrigation methods Perturbation analysis
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000861238900002
WOS关键词	EDDY-COVARIANCE ; CROP EVAPOTRANSPIRATION ; ENVIRONMENTAL CONTROLS ; STOMATAL CONDUCTANCE ; 10-YEAR VARIABILITY ; DECIDUOUS FOREST ; CARBON-DIOXIDE ; ARID REGION ; EXCHANGE ; TRANSPIRATION
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391643
推荐引用方式 GB/T 7714	Guo, Hui,Li, Sien,Kang, Shaozhong,et al. The controlling factors of ecosystem water use efficiency in maize fields under drip and border irrigation systems in Northwest China[J],2022,272.
APA	Guo, Hui.,Li, Sien.,Kang, Shaozhong.,Du, Taisheng.,Liu, Wenfeng.,...&Ding, Risheng.(2022).The controlling factors of ecosystem water use efficiency in maize fields under drip and border irrigation systems in Northwest China.AGRICULTURAL WATER MANAGEMENT,272.
MLA	Guo, Hui,et al."The controlling factors of ecosystem water use efficiency in maize fields under drip and border irrigation systems in Northwest China".AGRICULTURAL WATER MANAGEMENT 272(2022).