中国西南季风区不同水体稳定同位素特征分析——以重庆市北碚区为例

刘梦娇; 王 勇; 张耀华; 李 果

doi:10.11932/karst20150509

中国西南季风区不同水体稳定同位素特征分析——以重庆市北碚区为例

doi: 10.11932/karst20150509

西南大学地理科学学院

基金项目: 中央高校基本科研业务费专项(XDJK2013C050)；重庆市自然科学基金(CSTC2011BB0017)

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出版历程
- 发布日期: 2015-10-25

Variation characteristics of stable isotopes in different water bodies in Southwestern China monsoon area——A case study of Beibei District,Chongqing

School of Geographical Sciences,Southwest University

摘要

摘要: 通过对重庆市北碚区大气降水和马鞍溪上游龙滩子水库水的氢氧同位素进行的一个水文年（2014年）的样品采集监测，研究了降水与水库的水的氢氧同位素之间的变化特征和规律。结果表明：(1)北碚区大气降水线方程为δD=8.82δ18O+18.97，r=0.99，n=101，P<0.01，δD、δ18O相关性极为显著，该区大气降水线斜率和截距大于全球大气降水线和中国大气降水线，表明研究区主要受西南季风和东南季风双重影响所致；(2)大气降水中δD、δ18O具有明显的季节变化，夏半年偏负，冬半年偏正；(3)大气降水中的δD、δ18O与降水量及温度呈现负相关关系，降水量效应显著，并且该效应远远掩盖了温度效应；(4)水库中水的δD、δ18O具有极好的相关性，其δD、δ18O样点落于全球大气降水线和区域大气降水线附近，并且水库中水d的变化趋势与降水d基本一致，表明前者主要补给来源是降水，而水库中水的δD、δ18O和d的变化幅度远远小于降水，表明前者不仅受降水补给，还受土壤水和地下水的补给。
- 降水 /
- 不同水体 /
- 氢氧稳定同位素 /
- 过量氘 /
- 重庆北碚区
Abstract: The hydrogen and oxygen isotopes of precipitation water in Beibei District of Chongqing and water in Longtanzi reservoir in upper stream Maanxi were investigated during a hydrologic year (2014) ,to explore the relationship of δD and δ18O between precipitation and the reservoir water.It was found that the correlation between δD and δ18O in the precipitation is extremely significant, namely, δD=8.82δ18O+18.97,r=0.99,n=101,P<0.01.The slope and intercept of local meteoric water line are both greater than the global meteoric water line and China meteoric water line. The result suggested that southwest monsoon and southeast monsoon have alternative influence on local precipitation;(2) Both δD Dandδ18O values in rain water exhibited significant seasonal variations, having lower values in summer and higher ones in winter;(3)The δ value and precipitation as well as temperature assumed negative correlation. The precipitation amount effect of the δD and δ18O in the precipitation was very profound, which concealed the temperature effect;(4)The δD and δ18O in reservoir had a great correlation and they fell near the global meteoric water line and local meteoric water line. In addition, the excess deuterium (d) in the reservoir water and in the precipitation showed very similar patterns. The result indicated that the precipitation recharged the reservoir. However, the variety range of the δD and δ18O from reservoir was far less than precipitation. The result suggested that the reservoir was not only recharged by precipitation, but also by soil water and groundwater.
- precipitation /
- different water bodies /
- hydrogen and oxygen stable isotope /
- deuterium excess /
- Beibei District

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