摘要
为解析白洋淀湿地各水体的氢氧同位素组成特征,探究水体来源,采集了白洋淀地表水及周边地下水的水样,测定了水样中稳定氢氧同位素(δD、δ^18O和δ^17O)的值,并运用数理统计等方法分析了δD、δ^18O和δ^17O的相互拟合关系.结果表明:δD、δ^18O和δ^17O的变化范围分别为0.815%"~8.517%、0.107%~1.152%和0.056%~0.606%;地下水中稳定氢氧同位素的变化范围最大,河水与淀水中稳定氢氧同位素较地下水中的同位素富集;由于强烈的蒸发作用,白洋淀地区水体的同位素在4月枯水期较9月丰水期富集;白洋淀水体δD与δ^18O的拟合关系线为δD=5.777δ^18O+16.264(R^2=0.986),δ^17O与δ^18O的关系为δ^17O=0.526δ^18O+0.013(R2=1.000);氘盈余值为0.25%,17O盈余值为0.003%,丰枯水期17O盈余值的差异表明白洋淀水体的主要来源发生了变化.
In order to analyze the characteristics of hydrogen and oxygen isotopic composition of water in Baiyangdian wetland and explore the source of the water,the stable hydrogen and oxygen isotopes(δD,δ^18O and δ^17O)in the water were determined,and the fitting relationship amongδD,δ^18O and δ^17O was analyzed using mathematical statistics and other methods by collecting the water samples of underground water and surface water around Baiyangdian Lake.The results show that the range of δD,δ^18O and δ^17O values are 0.815%-8.517%,0.107%-1.152%and 0.056%-0.066%,respectively.The isotopic distribution range of underground water is the widest,while the stable hydrogen and oxygen isotopes in river water and lake water are more concentrated than those in the underground water.The isotope of the water in dry season(April)is more concentrated than that in the wet season(September)due to strong evaporation.The relationship between δD and δ^18O of water in Baiyangdian is δD=5.775 δ^18O+16.290(R^2=0.986).The relationship between δ17O and δ^18O is δ^17O=0.526 δ^18O+0.013(R^2=1.000).The average value of deuterium excess and 17O-excess are 0.25%and 0.003%,respectively.The difference of the 17O-excess value between the dry seasons and wet seasons indicates the different main water source of Baiyangdian Lake.
作者
何明霞
张兵
王义东
王中良
HE Mingxia;ZHANG Bing;WANG Yidong;WANG Zhongliang(Tianjin Key Laboratory of Water Resources and Water Environment,Tianjin Normal University,Tianjin 300387,China;School of Geographic and Environmental Sciences,Tianjin Normal University,Tianjin 300387,China)
出处
《天津师范大学学报（自然科学版）》
CAS
北大核心
2020年第6期62-67,共6页
Journal of Tianjin Normal University：Natural Science Edition
基金
国家自然科学基金资助项目(41971037)
天津市应用基础与前沿技术研究资助项目(15JCQNJC44200).
关键词
白洋淀
地表水和地下水
稳定氢氧同位素
氘盈余
17O盈余
Baiyangdian Lake
surface water and underground water
stable hydrogen and oxygen isotopes
deuteriumexcess
17O-excess
