干旱区生态环境知识资源中心(Arid): Spatiotemporal patterns of evapotranspiration, gross primary productivity, and water use efficiency of cropland in agroecosystems and their relation to the water-saving project in the Shiyang River Basin of Northwestern China

Arid

DOI	10.1016/j.compag.2020.105379
	Spatiotemporal patterns of evapotranspiration, gross primary productivity, and water use efficiency of cropland in agroecosystems and their relation to the water-saving project in the Shiyang River Basin of Northwestern China
	Tian, Fei 1; Zhang, Yu
通讯作者	Tian, Fei
来源期刊	COMPUTERS AND ELECTRONICS IN AGRICULTURE
ISSN	0168-1699
EISSN	1872-7107
出版年	2020
卷号	172
英文摘要	Water use efficiency over crop area (WUEc), defined as the ratio of carbon gain (i.e., gross primary productivity over crop area; GPPc) to water consumption (i.e., evapotranspiration over crop area; ETc) at the agroecosystems scale, is a critical variable linking the carbon and water cycles. In this study, the spatiotemporal patterns and trend characteristics of ETc, GPPc, and WUEc in agroecosystems over the period of 2000-2014 across the Shiyang River Basin in northwestern China were assessed with Moderate Resolution Imaging Spectroradiometer (MODIS) global products, and the impact of a water-saving project on WUEc is discussed. Results indicate that the spatiotemporal variability of ETc, GPPc, and WUEc were very common and similarly related to climatic variables and water allocation laws. It suggests that variations in climatic factors and the water-saving project controlled photosynthesis and ETc simultaneously; they changed the hydrological cycle by adjusting ETc. Based on a 15-year assessment, 97.25% of the basin showed a positive trend for WUEc. After the water-saving project launched in 2006, ETc was reduced by 23 mm yr(-1) (7.3%), while WUEc increased by 0.11 g C kg(-1) H2O (7.2%). The WUEc was significantly correlated with precipitation, and it was mainly determined by ETc rather than GPPc. The limitation of this research is the fact that the driving factors are not quantitatively characterized, especially at the basin scale. However, this research will not only aid in predictions about the influence of climate change and human activity on carbon and water fluxes but also provide scientific guidance to regulate water resources allocation, and this guidance can be applied to other arid regions around the world.
英文关键词	Water use efficiency Evapotranspiration Water saving project MODIS Remote sensing
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000525324700022
WOS关键词	3-TEMPERATURE MODEL ; FLUX MEASUREMENTS ; SATELLITE DATA ; CLIMATE-CHANGE ; ARID REGION ; MODIS-GPP ; TOWER ; EVAPORATION ; DESICCATION ; VALIDATION
WOS类目	Agriculture, Multidisciplinary ; Computer Science, Interdisciplinary Applications
WOS研究方向	Agriculture ; Computer Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314282
作者单位	1.Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China; 2.Minist Agr & Rural Affairs, Wuwei Expt Stn Efficient Water Use Agr, Wuwei 733000, Peoples R China
推荐引用方式 GB/T 7714	Tian, Fei,Zhang, Yu. Spatiotemporal patterns of evapotranspiration, gross primary productivity, and water use efficiency of cropland in agroecosystems and their relation to the water-saving project in the Shiyang River Basin of Northwestern China[J],2020,172.
APA	Tian, Fei,&Zhang, Yu.(2020).Spatiotemporal patterns of evapotranspiration, gross primary productivity, and water use efficiency of cropland in agroecosystems and their relation to the water-saving project in the Shiyang River Basin of Northwestern China.COMPUTERS AND ELECTRONICS IN AGRICULTURE,172.
MLA	Tian, Fei,et al."Spatiotemporal patterns of evapotranspiration, gross primary productivity, and water use efficiency of cropland in agroecosystems and their relation to the water-saving project in the Shiyang River Basin of Northwestern China".COMPUTERS AND ELECTRONICS IN AGRICULTURE 172(2020).