干旱区生态环境知识资源中心(Arid): 黑河中游临泽地区沙丘植物水分来源的D、~(18)O同位素示踪

Arid

	黑河中游临泽地区沙丘植物水分来源的D、~(18)O同位素示踪
其他题名	Using D and 18O Stable Isotopes to Determine the Water Sources of Sand Dune Plants in Linze,Middle Reaches of Heihe River
	周辰昕 1; 孙自永 2; 余绍文 3
来源期刊	地质科技情报
ISSN	1000-7849
出版年	2011
卷号	30 期号:5 页码:103-109
中文摘要	基于2008年7月份降雨、地下水、土壤水和植物茎干水的D、~(18)O同位素观测结果,分析了黑河中游临泽地区沙丘顶、底部不同深度土壤水分的来源,确定了红柳、花棒、梭梭等沙丘植物的吸水层位及其对降雨和地下水的依赖程度,发现:①土壤水delta(D)、delta(~(18)O)剖面总体呈指数形式,局部受降雨事件入渗过程影响,土壤剖面的上界面受连续蒸发和降雨入渗作用,下界面接受潜水的连续补给;②地表至20~30cm深度内的土壤水由最近的降雨补给,其下至130cm深度内的土壤水由此前1~2周的降雨事件叠加补给,130~150cm深度以下的土壤水主要由潜水补给,偶尔混有前期较大降雨事件的入渗补给;③除沙丘底部的花棒利用较浅层次(120~180cm深度)的土壤水外,其他物种都利用≥185cm深度的土壤水,表明研究点的沙丘植物主要依赖更为稳定的潜水水源,偶尔利用入渗深度较大的降雨。
英文摘要	Using the measured deltaD and delta~(18)O values of rainfall,groundwater and waters extracted from vegetation and soils,this paper discussed the sources of soil water at different depths at the top and bottom of one sand dune in Linze,middle reaches of Heihe River,and determined the soil layers from which three sand dune plants extract water,and the dependence of these plants on the rainfall and groundwater.The results showed that,when viewed as a whole,deltaD and delta~(18)O values of soil water declined as a typical exponential function of depth,except that some details of the exponential curve were altered by the infiltration of individual rainfall events.It was indicated that the soil profiles were affected by evaporation and infiltration of rainfall along the top boundary and received recharge from phreatic aquifer through the bottom boundary.Soil water might be recharged by the latest rainfall event for the upmost layer to a depth of 20 cm or 30 cm,by all rainfall events occurring in recent 1-2 weeks for the medium layer from 20 cm or 30 cm to 130 cm in depth,and mainly by phreatic water,accidently mixed with earlier extensive rainfall events,for the bottommost layer under a depth of 130 cm.Hedysarum scoparium extracted soil water from 120 cm to 180 cm in depth at the bottom of the sand dune.Tamarix ramosissima Ledeb and Haloxylon ammodendron,at both the bottom and top of the sand dune,and Hedysarum scoparium at the top of the sand dune,extracted soil water under the depth of 185 cm.It was presumed that the sand dune plants here mainly relied on the more stably available phreatic water,accidently using the rainfall with a large limit depth of infiltration.
中文关键词	稳定氢氧同位素 ; 植物水分来源 ; 黑河 ; 干旱区
英文关键词	stable hydrogen and oxygen isotopes water source of plant Heihe River arid region
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:4388416
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226318
作者单位	1.成都理工大学环境与土木工程学院, 成都, 四川 610059, 中国; 2.(武汉)中国地质大学环境学院, 武汉, 湖北 430074, 中国; 3.中国地质调查局武汉地质调查中心, 武汉, 湖北 430205, 中国
推荐引用方式 GB/T 7714	周辰昕,孙自永,余绍文. 黑河中游临泽地区沙丘植物水分来源的D、~(18)O同位素示踪[J],2011,30(5):103-109.
APA	周辰昕,孙自永,&余绍文.(2011).黑河中游临泽地区沙丘植物水分来源的D、~(18)O同位素示踪.地质科技情报,30(5),103-109.
MLA	周辰昕,et al."黑河中游临泽地区沙丘植物水分来源的D、~(18)O同位素示踪".地质科技情报 30.5(2011):103-109.