| 西藏雨季主要水体氢、氧同位素特征 |
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| 引用本文： | 李继荣,赵健宇,杨乐,张唐伟,仓决卓玛.西藏雨季主要水体氢、氧同位素特征[J].干旱区研究,2017,34(2). |
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| 作者姓名： | 李继荣 赵健宇 杨乐 张唐伟 仓决卓玛 |
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| 作者单位： | 1. 西藏自治区高原生物研究所,西藏拉萨850000;西藏自治区农牧科学院农业质量标准与检测研究所,西藏拉萨850000;2. 湖南农业大学生物科学技术学院,湖南长沙,410128;3. 西藏自治区高原生物研究所,西藏拉萨,850000;4. 西藏自治区农牧科学院农业质量标准与检测研究所,西藏拉萨,850000 |
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| 基金项目： | 国家自然科学基金项目，西藏自治区自然科学基金项目 |
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| 摘 要： | 通过对2014年雨季西藏境内63处水体中δD和δ~(18)O值的测定,分析其中氢、氧稳定同位素组成特征。结果表明:水体δD和δ~(18)O的取值范围分别为-152.06‰~-19.05‰和-16.96‰~4.66‰,δD较δ~(18)O的标准差大,平均值分别为-101.38‰和-9.67‰;3种水体的δD和δ~(18)O值关系为湖泊δD相对河流δD富集,河流δD相对沼泽δD富集,湖泊δ~(18)O相对河流δ~(18)O和沼泽δ~(18)O富集,河流δ~(18)O和沼泽δ~(18)O无差异;蒸发趋势方程分别为δD湖泊=6.14δ~(18)O-45.48(n=22,R2=0.855),δD河流=7.83δ~(18)O-26.22(n=32,R2=0.858),δD沼泽=5.93δ~(18)O-52(n=9,R2=0.723),河流相比湖泊和沼泽水体的δD与δ~(18)O更易受大气降水的影响;氘过量参数特征为湖泊-79‰~-17‰,河流-40‰~-5‰,湿地沼泽-34‰~-7‰,表现出蒸发强烈的水体特征;沼泽水体δ~(18)O与纬度的一元线性回归方程为y=1.67x-63.23。
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| 关 键 词： | 雨季 湖泊 河流 沼泽 蒸发 稳定同位素(δD和δ18O) 西藏 |
Stable Hydrogen and Oxygen Isotopes in Waters in Tibet |
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| LI Ji-rong,ZHAO Jian-yu,YANG Le,ZHANG Tang-wei,Tsamchu Drolma.Stable Hydrogen and Oxygen Isotopes in Waters in Tibet[J].Arid Zone Research,2017,34(2). |
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| Authors: | LI Ji-rong ZHAO Jian-yu YANG Le ZHANG Tang-wei Tsamchu Drolma |
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| Abstract: | In order to explore the characteristics of stable isotopes in waters,the stable hydrogen and oxygen isotopes in 63 water samples collected from Tibet in 2014 rainy season were measured.The results showed that the stable hydrogen and oxygen isotopes in the water samples varied in ranges from-152.06‰ to-19.05‰ and from -16.96‰ to 4.66‰,the standard deviation of δD was higher than that of δ18O,the mean values of δD and δ18O were-101.38‰ and-9.67‰,respectively.The enrichment of δDlake was higher than that of δDriver that of δDriver was higher than that of δDwetland,that of δ18O1ake was higher than that of δ18Oriver and δ18Owetland,and there was no significant difference between δ18Oriver and δ18Owetland.Evaporation trend equations of lake water,river water and wetland water could be expressed as δDlake =6.14δ18O-45.48 (n =22,R2 =0.855),δDriver =7.83δ18 O-26.22(n =32,R2 =0.858),and δDwetland =5.93 δ18O-52 (n =9,R2 =0.723).The stable hydrogen and oxygen isotopes in river water were more easily affected by precipitation compared with those in lake water and wetland water.Deuterium excess parameters of lake water,river water and wetland water were-79‰ ～-17‰,-40‰ ～-5‰ and-34‰ ～-7‰ respectively,showing a strong evaporation from the waters.The linear regression equation between δ18Owetland and latitude could be expressed as y =1.67x-63.23. |
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| Keywords: | rainy season lake river wetland evaporation stable isotope (δD and δ18 O) Tibet |
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