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。
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 δ1SO were - 101.38‰ and -9.67‰, respectively. The enrichment of δDlake, was higher 1than that of δDriver that of δDriver was higher than that of δDwetland, that of δ18Olake was higher than that of δ18Oriver and δ18Owetland, and there was no significant difference between δ18Orivor and δ18Owrtland. Evaporation trend equations of lake water, river water and wetland water could be expressed as δDlake =6. 148180 -45.48（n =22, R2 =0. 855）, δDriwr =7. 838180 - 26.22 （ n = 32, R2 = 0. 858）, and δDwetland = 5.93 818 0 - 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.
作者
李继荣
赵健宇
杨乐
张唐伟
仓决卓玛
LI Ji-rong ZHAO Jian-yu YANG Le ZHANG Tang-wei Tsamchu Drolma(Tibet Plateau Institute of Biology, Lhasa 850000, Tibet, China Institute of Agricultural Product Quality Standard and Testing Research, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa 850000, Tibet, China College of Bioscience and Biotechnology , Hunan Agricultural University, Changsha 410128, Hunan , China)
出处
《干旱区研究》
CSCD
北大核心
2017年第2期411-415,共5页
Arid Zone Research
基金
国家自然科学基金项目(31360141)
西藏自治区自然科学基金项目(Z2012A49G27/00)
