【摘要】 通过对2014年雨季西藏境内63处水体中δD和δ¹⁸O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δ¹⁸O的取值范围分别为-152.06‰^-19.05‰和-16.96‰⁴.66‰,δD较δ¹⁸O的标准差大,平均值分别为-101.38‰和-9.67‰;3种水体的δD和δ¹⁸O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δ¹⁸O相对河流δ¹⁸O和沼泽δ¹⁸O富集,河流δ¹⁸O和沼泽δ¹⁸O无差异;蒸发趋势方程分别为δD湖泊=6.14δ¹⁸O-45.48（n=22,R2=0.855）,δD河流=7.83δ¹⁸O-26.22（n=32,R2=0.858）,δD沼泽=5.93δ¹⁸O-52（n=9,R2=0.723）,河流相比湖泊和沼泽水体的δD与δ¹⁸O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δ¹⁸O与纬度的一元线性回归方程为y=1.67x-63.23。更多还原

【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 andδ¹⁸O were- 101. 38‰ and- 9. 67‰,respectively. The enrichment of δDlakewas higher than that of δDriver,that of δDriverwas higher than that of δDwetland,that of δ¹⁸Olakewas higher than that of δ¹⁸Oriverand δ¹⁸Owetland,and there was no significant difference between δ¹⁸Oriverand 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. 83δ¹⁸O-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 δ¹⁸Owetlandand latitude could be expressed as y = 1. 67x- 63. 23.更多还原