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

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3.1～6.3 mmol/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...

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Published in中国岩溶 Vol. 31; no. 2; pp. 145 - 153
Main Author 曹敏 蒋勇军 蒲俊兵 张兴波 邱述兰 杨平恒 汪智军 李欢欢
Format Journal Article
LanguageChinese
Published 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,重庆,400715%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,广西桂林,541004 2012
Subjects
DIC
δ13CDIC
地下河
岩溶
碳汇
重庆
地下河
碳汇
重庆
岩溶
δ13CDIC
DIC
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ISSN1001-4810
DOI10.3969/j.issn.1001-4810.2012.02.006

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Summary: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3.1～6.3 mmol/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。
Bibliography:dissolution of carbonate rocks;DIC; δ13CDIc;CO2 sink flux; Laolongdong subterranean stream
45-1157/P
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 δ13CDIC varies from -3.8 N0 to -13. 1‰ and is 2‰ higher in the summer than the winter. According to the D
ISSN:1001-4810
DOI:10.3969/j.issn.1001-4810.2012.02.006