重庆地区岩溶地下河水溶解无机碳及其稳定同位素特征

蒲俊兵

doi:10.3969/j.issn.1001-4810.2013.02.001

重庆地区岩溶地下河水溶解无机碳及其稳定同位素特征

doi: 10.3969/j.issn.1001-4810.2013.02.001

蒲俊兵

中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室/联合国教科文组织国际岩溶研究中心

基金项目: 国家自然科学基金(41202185)、国土资源部公益性行业科研专项（201311148）、广西自然科学基金项目（2012GXNSFBA053137）、中国地质调查局地质调查项目（12120113006700）和IGCP/SIDA598项目

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出版历程
- 收稿日期: 2013-02-08
- 发布日期: 2013-06-25

Dissolved inorganic carbon and stable carbon isotope in karst subterranean streams in Chongqing, China

PU Jun bing

Institute of Karst Geology, Chinese Academy of Geological Sciences / Key Laboratory of Karst Dynamics,MLR & GZAR/ International Research Center on Karst under the Auspices of UNESCO

摘要

摘要: 稳定碳同位素是指示岩溶动力系统碳来源及转化的重要指标。为揭示重庆地区岩溶地下水中溶解无机碳基本特征和碳来源，本文对该地区63条岩溶地下河水样进行了水化学和碳同位素分析。研究结果表明，重庆地区地下河水溶解无机碳主要表现形式为HCO3-，雨季由于稀释作用其浓度低于旱季。重庆岩溶地下河水δ13C-DIC（V-PDB）旱季变化范围为-15.34 ‰～-5.89 ‰，雨季变化范围为-17.40 ‰～-4.23 ‰。根据δ13C同位素质量平衡方法，计算得到重庆地下河旱季碳酸盐岩溶蚀对DIC贡献为45.1 % ～79.7 %，雨季平均为34.6 %～82.1 % 。计算结果表明，在人类活动不断增强的情况下，岩溶水体DIC通量中碳酸盐岩溶解来源的DIC和其参与岩溶地下水δ13C值的形成并不一定是岩溶作用理论方程中所计算的50 %，而是有一定的变化范围。因此在计算岩溶作用碳汇时，建议通过δ13C值扣除碳酸盐岩溶蚀形成DIC的通量后再来推算岩溶作用形成的碳汇量。
- 溶解无机碳 /
- 碳同位素 /
- 岩溶地下河 /
- 重庆
Abstract: Stable carbon isotope is a useful and powerful tool for tracing the origin and transformation of carbon in karst dynamics system. 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 study. 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 study. 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 study suggests that we 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.
- dissolved inorganic carbon /
- stable carbon isotope /
- karst subterranean steam /
- Chongqing municipality

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