Dissolved Inorganic Carbon and Stable Carbon Isotope in Karst Subterranean Streams in Chongqing, China
详细信息
- 责任者：Pu Junbing (Key Laboratory of Karst Dynamics of GZAR ; MLR ; International Research Center on Karst under the Auspices of UNESCO ; Guilin 541004 ; China)
- 刊名：Carsologica Sinica
- 出版年：2013
- 卷期：32(2)
- 关键词：岩溶环境 ; karst environment ; 地下河 ; underground streams ; 重庆 ; Chongqing
- 页码：p.123-132
- 图表：6 illus., 2 tables, 38 refs.
- 分类号：1701
- issnNo：ISSN1001-4810
- isbnNo：CN45-1157/P
摘要
///For obtaining the characteristics of hydrochemistry and isotope,groundwater samples in wet and dry seasons from 63 karst subterranean streams in Chongqing are collected in this paper.The results show that the HCO3- is the dominant species of the DIC in ground waters and the concentration of HCO3- is lower in wet season than dry season due to dilution.δ13C-DIC(V-PDB) in karst subterranean streams in Chongqing varies from -15.34‰～-5.89‰in dry season and from -17.40‰～-4.23‰ in wet season.The widely variations of δ13C in wet season show the complex origins of carbon in karst subterranean streams in wet season.Based on the δ13C isotope mass balance equation,the amount of DIC that comes from the carbonate rock dissolution is calculated in this paper.The calculated results show that 45.1%～79.7% of the DIC in the dry season and 34.6%～82.1% in the wet season is from dissolution of carbonate rocks in karst groundwater.The calculated results also shows that the DIC and the corresponding δ13C proportion originated from the carbonate rock dissolution is not necessarily 50% according to the molar ration of karst chemical reaction equation,but has a changes range at some extend.As a result,this paper suggests that the authors should deduct first the DIC originated from the carbonate rock dissolution using the δ13C when we calculate the carbon sink of karst processes,and then calculate further the karst carbon sink.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |