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	Evapotranspiration and its main controlling mechanism over the desert riparian forests in the lower Tarim River Basin
	Yuan G. F.; Luo, Y.; Shao, M. A.; Zhang, P.; Zhu, X. C.
	2015
关键词	lower reaches of the Tarim River water cycling evapotranspiration desert riparian forests Tamarix spp. Populus euphratica northwestern china lower reaches water vegetation dynamics xinjiang areas
英文摘要	Evapotranspiration (ET) and its controlling mechanism over the desert riparian forests in arid regions are the important scientific basis for the water resources managements of the lower reaches of the inland rivers of China. Nearly three years of continuous measurements of surface ET, soil water content at different depths and groundwater table over a typical Tamarix spp. stand and a typical Populus euphratica stand were conducted in the lower reach of the Tarim River. The ET seasonal trends in the growing season were controlled by plant phenology, and ET in non-growing season was weak. The diurnal variations of ET resulting from the comprehensive effects of all atmospheric factors were significantly related with reference ET. The spatial pattern of ET was determined by vegetation LAI, more vegetation coverage, more ET amount. Groundwater is the water source of surface ET, and the soil water in shallow layers hardly took part in the water exchange in the groundwater-soil-plant-air system. The temporal processes of ET over the Tamarix stand and the Populus stand were similar, but the water consumption of the well-grown Populus euphratica was higher than that of the well-grown Tamarix spp. Further analysis indicates that plant transpiration accounts for most of the surface ET, with soil evaporation weak and negligible; groundwater table is a crucial factor influencing ET over the desert riparian forests, groundwater influences the processes and amounts of ET by controlling the growth and spatial distribution of desert riparian forests; quantifying the water stress of desert riparian forests using groundwater table is more appropriate, rather than soil water content. Based on the understanding of ET and water movements in the groundwater-soil-plant-air system, a generalized framework expressing the water cycling and its key controlling mechanism in the lower reaches of the inland rivers of China is described, and a simple model to estimate water requirements of the desert riparian forests is presented.
出处	Science China-Earth Sciences
卷	58
期	6
页	1032-1042
收录类别	SCI
语种	英语
ISSN号	1674-7313
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/39012]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Yuan G. F.,Luo, Y.,Shao, M. A.,et al. Evapotranspiration and its main controlling mechanism over the desert riparian forests in the lower Tarim River Basin. 2015.

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