An isotope study (delta O-18 and delta D) of water movements on the Loess Plateau of China in arid and semiarid climates

doi:10.1016/j.ecoleng.2016.05.039

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	An isotope study (delta O-18 and delta D) of water movements on the Loess Plateau of China in arid and semiarid climates
	Wan, Hao 1,3; Liu, Weiguo 1,2
	2016-08-01
发表期刊	ECOLOGICAL ENGINEERING
卷号	93 期号:2016 页码:226-233
文章类型	Article
摘要	Precipitation infiltration and evaporation are the main controlling factors on soil water content (SWC) in the Chinese Loess Plateau (CLP). However, the temporal and spatial variations of soil water in the CLP are still unclear. Here, we investigate the stable isotope compositions (delta O-18 and delta D) of soil water for five different vegetation cover types in the central CLP, to trace the dynamics and movement mechanisms of soil water. Our results show that the depth of precipitation infiltration is approximately 120 cm in five different vegetation cover types under natural rainfall conditions throughout the year. The rapid O-18-enrichment of shallow (<30 cm depth) soil water, which is observed in all profiles, indicates that the evaporation effect mainly occurs in the shallow layer. The delta O-18 isotope dynamic pattern between 30 and 120 cm depth is probably controlled by the precipitation infiltration characteristics at a mean annual precipitation of 572.4 mm. In contrast, deep (>120 cm depth) soil water is in a steady state in our study period, which suggest that the residence times of this water can be several months or more. Although the vegetation cover types can affect the profile dynamics of delta O-18, we find that variations in seasonal precipitation are the key factor that influences the profile dynamics of delta O-18, which is attributed to the large differences in the climate parameters and the frequency of rainfall. We suggest that delta O-18 is more sensitive in tracing the precipitation infiltration depth and recharge mechanisms of soil water than the soil water content. Further observation over a much longer time scale and an combination of both the oxygen and hydrogen isotope compositions of soil water in the CLP would provide more insight into role of isotopic techniques in tracing the soil water cycle.
关键词	The Loess Plateau Of China Isotopic Tracer Delta O-18 Soil Water Content
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Technology
DOI	10.1016/j.ecoleng.2016.05.039
关键词[WOS]	SOIL-WATER ; STABLE-ISOTOPES ; GROUNDWATER SYSTEM ; RESIDENCE TIMES ; FLOW PATHS ; OXYGEN ; HYDROGEN ; RECHARGE ; TRANSPIRATION ; PRECIPITATION
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Engineering
WOS类目	Ecology ; Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:000377602000029
引用统计	被引频次：30[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/5730
专题	加速器质谱中心
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary, Xian 710061, Peoples R China 2.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wan, Hao,Liu, Weiguo. An isotope study (delta O-18 and delta D) of water movements on the Loess Plateau of China in arid and semiarid climates[J]. ECOLOGICAL ENGINEERING,2016,93(2016):226-233.
APA	Wan, Hao,&Liu, Weiguo.(2016).An isotope study (delta O-18 and delta D) of water movements on the Loess Plateau of China in arid and semiarid climates.ECOLOGICAL ENGINEERING,93(2016),226-233.
MLA	Wan, Hao,et al."An isotope study (delta O-18 and delta D) of water movements on the Loess Plateau of China in arid and semiarid climates".ECOLOGICAL ENGINEERING 93.2016(2016):226-233.

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