多年冻土区风火山流域降水河水稳定同位素特征分析

被引:15
作者
刘光生 [1 ,2 ]
王根绪 [1 ]
孙向阳 [1 ,2 ]
高洋 [1 ,2 ]
机构
[1] 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
[2] 不详
关键词
δ18O; 风火山流域; 同位素; 降水; 多年冻土; 河水;
D O I
10.14042/j.cnki.32.1309.2012.05.017
中图分类号
P339 [水文循环与水文气象];
学科分类号
摘要
由于多年冻土区流域土壤冻融过程对水循环影响的复杂性,水循环物理过程观测存在困难和不足,而利用稳定同位素方法可以有效地解决该问题。因此,基于2009年长江源风火山流域夏季定点降水和河水δD和δ18O,对研究区降水河水稳定同位素特征进行分析。结果表明,研究区夏季降水δD和δ18O受到降水量和温度的双重影响,即受海洋性和大陆局地气团的交替影响。河水氢氧同位素的季节变化和空间差异与壤中流、地下水补给河流的季节差异和植被覆盖的空间差异有关。随着地温升高和土壤冻融锋面的迁移,河水补给来源和同位素特征发生改变,表明土壤冻融变化对多年冻土流域径流过程起到重要作用。此外,蒸发分馏作用是研究区河水同位素的重要影响因素。
引用
收藏
页码:621 / 627
页数:7
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