IMHE OpenIR  > 山地表生过程与生态调控重点实验室
长江源多年冻土区季节性河流氢、氧同位素组成
Alternative TitleComposition of hydrogen and oxygen stable isotopes in seasonal river in permafrost watershed of Yangtze River headwater region
刘光生1; 王根绪2; 高洋2; 赵超1
Corresponding Author刘光生
2015
Source Publication生态学杂志
ISSN1000-4890
Volume34Issue:6Pages:1622-1629
Other Abstract

氢、氧稳定同位素方法是研究多年冻土区水文过程的一种有效手段。基于2009年风火山流域降水和河水δD和δ18O数据,结合水文气象资料,分析多年冻土区季节性河流氢、氧同位素组成。研究表明,研究期间(6—10月)δ18O、δD和氘过剩河水与降水均呈下降的趋势,表明研究区降水是河水的重要补给来源。2#、3#流域δD分别为-66.8‰和-69.6‰,与降水δD(-66.7‰)基本相当;5#流域δD为-62.4‰,显著高于降水。5#流域较高的植被覆盖使地表具有更高的有机质含量、水分和蒸散量,其强烈的蒸发分馏作用使河水富集重同位素。6月份,随着土壤向下融化,降水(δD=-12.1‰)驱替冻结封存的重同位素贫化的土壤水(δD=-71.3‰)补给河流;10月份,地表冻结后抑制降水下渗,使降水和河水δD趋于一致,反映了土壤冻融过程在多年冻土区径流过程中起到的重要影响。该研究为多年冻土区水文过程的变化规律提供了同位素证据。 
 

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Frozen soil plays a key role in hydrological processes and their observations are rare and difficult in permafrost regions. The stable hydrogen and oxygen isotope methods provide a useful tool for permafrost hydrology research. In this study, stable hydrogen and oxygen isotopes composition in seasonal river water was analyzed based on the stable isotope ratios (8D and delta~(18)O) data in precipitation and river water in a permafrost watershed in Yangtze River headwater region in 2009, combined with meteorological and hydrological data. The results showed that the delta~(18)O, 8D and the excess deuterium variation of river water and rainfall all presented descending trends during research period. This implies that the precipitation is the most important source of river water. The 8D in river water in the 2nd and 3rd sub-basin were -66.8%o and -69.6%o, respectively ,which were similar to the 8D in precipitation (-66.7%o). However, the 8D in river water in the 5th sub-basin (62.4%o) was significantly higher than that in precipitation. Higher vegetation coverage in the 5th sub-basin,higher soil organic matter content,soil moisture and actual evapotranspiration and strong evaporation fractionation effect enriched river water in the 5 th sub-basin with heavy isotopes. In June,as the soil melt down,frozen soil water of heavy isotope (8D, -71.3%。) was displaced by precipitation (deltaD, -12.1%o) and then fed the river water. In October, the frozen soil inhibited precipitation infiltration and made hydrogen isotope change quickly with precipitation. These indicate that the freeze-thaw cycle plays an important role in runoff processes in the permafrost regions. This study provides isotopic evidence in hydrological cycle research and a theoretical support of water resource protection in permafrost regions.

Keyword长江源 河水 多年冻土 氢、氧同位素 冻融过程
Subject AreaP342
DOI10.13292/j.1000-4890.2015.0147
Indexed ByCSCD ; 北大中文核心
Language中文
CSCD IDCSCD:5433069
Funding Organization国家自然科学基金项目(40925002) ; 厦门理工学院高层次人才引进项目(YKJ12018R) ; 厦门市科技计划项目(3502Z20130039)
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Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18371
Collection山地表生过程与生态调控重点实验室
Affiliation1.厦门理工学院环境科学与工程学院
2.中国科学院成都山地灾害与环境研究所山地表生过程与生态调控重点实验室
Recommended Citation
GB/T 7714
刘光生,王根绪,高洋,等. 长江源多年冻土区季节性河流氢、氧同位素组成[J]. 生态学杂志,2015,34(6):1622-1629.
APA 刘光生,王根绪,高洋,&赵超.(2015).长江源多年冻土区季节性河流氢、氧同位素组成.生态学杂志,34(6),1622-1629.
MLA 刘光生,et al."长江源多年冻土区季节性河流氢、氧同位素组成".生态学杂志 34.6(2015):1622-1629.
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