重庆南山老龙洞地下河流域岩溶地下水DIC和δ13CDIC及其流域碳汇变化特征

曹敏; 蒋勇军; 蒲俊兵; 张兴波; 邱述兰; 杨平恒; 汪智军; 李欢欢

doi:10.3969/j.issn.1001-4810.2012.02.006

重庆南山老龙洞地下河流域岩溶地下水DIC和δ13CDIC及其流域碳汇变化特征

doi: 10.3969/j.issn.1001-4810.2012.02.006

1.
三峡库区生态环境教育部重点实验室、西南大学地理科学学院岩溶环境与石漠化治理研究所
2.
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

基金项目: 国家自然科学基金项目(41172331、41072192、41103068),中国地质调查局项目(1212011087119),国土资源部公益性专项(201111022),国土资源部岩溶动力重点实验室开放课题(KDL2011-01),重庆市科委院士基金项目(2010BC7004),重庆市国土与房管局科技项目

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出版历程
- 收稿日期: 2012-01-02
- 发布日期: 2012-06-25

Variations in DIC and δ13C DIC of the karst groundwater and in carbon sink of Laolongdong subterranean stream basin at Nanshan, Chongqing

1.
Key Laboratory of the Three Gorges Reservior Regions Eco-Environments, MOE& School of Geographical Sciences, Institute of Karst Environment and Rock Desertification Control, Southwest University
2.
Institute of Karst Geology, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, MLR & GZAR

摘要

摘要: 以重庆南山老龙洞岩溶地下河流域为例,通过分析地下河水DIC变化特征与来源,估算了流域岩溶碳汇通量,并探讨了自然条件和人类活动对岩溶碳汇的影响。研究结果表明,老龙洞地下河的水化学类型为Ca-HCO3-SO4型,显示其形成过程中受碳酸盐岩碳酸溶蚀和硫酸溶蚀共同控制。地下河水DIC浓度为3.1~6.3mmol/L,其中夏季因受降雨稀释作用影响DIC较冬季的低;地下河水δ13CDIC值介于-3.8‰~-13.1‰之间,且夏季比冬季偏高约2‰。根据地下河水DIC浓度和流域径流量计算出流域岩溶净碳汇通量均值约为167.31×103mol/(km2?a)。降雨条件下,流域岩溶碳汇通量随流域径流量的迅速增加而增加。另外,流域碳酸盐岩溶蚀还受到人类活动产生的硫酸型酸雨影响,使得地下水δ13CDIC值相对偏高,它在一定程度上减少了流域碳汇通量。
- 岩溶 /
- DIC /
- δ13CDIC /
- 碳汇 /
- 地下河 /
- 重庆
Abstract: Study on chemical weathering of carbonate rock is of great significance for further understanding of the global carbon cycle. In this study, groundwater samples from the Laolongdong subterranean stream at Nanshan, Chongqing are investigated to analyze the variations in DIC and its origins. The carbon sink in the entire basin is calculated based on DIC concentrations and stream discharge rate, and the influence of related natural and human factors on the carbon sink is presented, too. The groundwater shows a Ca-HCO3-SO4 hydrochemistry type, indicating the dominant control of the dissolution of carbonate rock both by carbon and sulfuric acids in the basin. The concentration of DIC ranges from 3.1 mmol/L to 6.3 mmol/L and is generally low during rainy season due to the dilution by large amount of rainwater. The δ13C DIC varies from -3.8‰ to -13.1‰ and is 2‰ higher in the summer than the winter. According to the DIC concentration and stream discharge, the carbon sink in the Laolongdong subterranean stream is estimated to be averaged in about 167.31×103 mol/(km2? a) and tends to be higher in the summer but lower in the winter. During rainfall events, the carbon sink increases rapidly with the increase of discharge. Besides, the sulfuric acids derive from anthropogenic activities have great impact on the dissolution of carbonate rocks, resulting in relatively higher δ13C DIC values, especially in summer, which can reduce carbon sink caused by chemical weathering on carbonate rocks in the basin to a certain degree.
- dissolution of carbonate rocks /
- DIC /
- δ13C DIC /
- CO2 sink flux /
- Laolongdong subterranean stream /

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