气候变化领域集成服务门户(CCPortal): Interannual Variations of Evapotranspiration and Water Use Efficiency over an Oasis Cropland in Arid Regions of North-Western China

CCPortal

DOI	10.3390/w12051239
	Interannual Variations of Evapotranspiration and Water Use Efficiency over an Oasis Cropland in Arid Regions of North-Western China
	Wang, Haibo; Li, Xin; Tan, Junlei
通讯作者	Li, X (通讯作者)
发表日期	2020
EISSN	2073-4441
卷号	12 期号:5
英文摘要	The efficient use of limited water resources and improving the water use efficiency (WUE) of arid agricultural systems is becoming one of the greatest challenges in agriculture production and global food security because of the shortage of water resources and increasing demand for food in the world. In this study, we attempted to investigate the interannual trends of evapotranspiration and WUE and the responses of biophysical factors and water utilization strategies over a main cropland ecosystem (i.e., seeded maize, Zea mays L.) in arid regions of North-Western China based on continuous eddy-covariance measurements. This paper showed that ecosystem WUE and canopy WUE of the maize ecosystem were 1.90 +/- 0.17 g C kg(-1) H2O and 2.44 +/- 0.21 g C kg(-1) H2O over the observation period, respectively, with a clear variation due to a change of irrigation practice. Traditional flood irrigation generally results in over-irrigation, providing more water than actual crop requirements. Unlike flood irrigation, which can infiltrate into deep soil layers, drip irrigation can only influence the shallow soil moisture, which can lead to decreases of soil moisture of approximately 27-32% and 36-42% compared with flood irrigation for shallow and deep layers, respectively. Additionally, drip irrigation decreases evapotranspiration by 13% and transpiration by 11-14%, leading to increases in ecosystem and canopy WUE of 9-14% and 11%, respectively, compared to the traditional irrigation practice. Therefore, the drip irrigation strategy is an effective method to reduce irrigation water use and increase crop WUE in arid regions. Our study provides guidance to water-saving cultivation systems and has implications for sustainable water resources management and agriculture development in water-limited regions.
关键词	HEIHE RIVER-BASIN PARAMETER-ESTIMATION EDDY-COVARIANCE CARBON-DIOXIDE SPRING WHEAT WINTER-WHEAT ECOSYSTEMS YIELD FLUX EVAPORATION
英文关键词	evapotranspiration; arid regions; water use efficiency (WUE); eddy covariance; gross primary productivity; agriculture ecosystem
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
WOS类目	Environmental Sciences ; Water Resources
WOS记录号	WOS:000555915200018
来源期刊	WATER
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259669
推荐引用方式 GB/T 7714	Wang, Haibo,Li, Xin,Tan, Junlei. Interannual Variations of Evapotranspiration and Water Use Efficiency over an Oasis Cropland in Arid Regions of North-Western China[J]. 中国科学院青藏高原研究所,2020,12(5).
APA	Wang, Haibo,Li, Xin,&Tan, Junlei.(2020).Interannual Variations of Evapotranspiration and Water Use Efficiency over an Oasis Cropland in Arid Regions of North-Western China.WATER,12(5).
MLA	Wang, Haibo,et al."Interannual Variations of Evapotranspiration and Water Use Efficiency over an Oasis Cropland in Arid Regions of North-Western China".WATER 12.5(2020).