酸雨对桂林枯水期岩溶地下水δ13CDIC及碳汇效应的影响

黄奇波; 覃小群; 刘朋雨; 唐萍萍

doi:10.3799/dqkx.2015.103

Volume 40 Issue 7

Jul. 2015

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Article Navigation > Earth Science > 2015 > 40(7): 1237-1247

Huang Qibo, Qin Xiaoqun, Liu Pengyu, Tang Pingping, 2015. Impact of Acid Rain to δ13CDIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin. Earth Science, 40(7): 1237-1247. doi: 10.3799/dqkx.2015.103

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Huang Qibo, Qin Xiaoqun, Liu Pengyu, Tang Pingping, 2015. Impact of Acid Rain to δ¹³C_DIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin. Earth Science, 40(7): 1237-1247. doi: 10.3799/dqkx.2015.103

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Impact of Acid Rain to δ¹³C_DIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin

doi: 10.3799/dqkx.2015.103

Huang Qibo^{1, 2, 3
,},
Qin Xiaoqun^{2, 3},
Liu Pengyu^{2, 3},
Tang Pingping^{2, 3}

1.
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
2.
Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
3.
Guangxi Key Laboratory of Karst Dynamics, Ministry of Land and Resources, Guilin 541004, China

Received Date: 2014-12-06
Publish Date: 2015-07-15

Abstract

Abstract

Quantitative evaluation of the impact of sulfuric acid to karst carbon sink not only improves the estimation accuracy of karst carbon sinks, but also facilitates research on global climate change. In this paper, Guilin karst area affected by acid rain is selected for studying. The results of testing and analysis of the chemical composition and inorganic carbon isotope in 14 karst spring and 15 subterraneans show that in both karst spring and subterranean, Mg²⁺ and Ca²⁺ are the main negative ions, and HCO₃^- is the main positive ion, which were accounted for more than 90% of negative ion and positive ion respectively, and SO₄^2- has a lower content, which content range was 0.004-0.213mmol/L and the composition ratio was 0.12%-6.11%; The δ¹³C_DIC, [Ca²⁺+Mg²⁺]/[HCO₃^-] are more inclined to carbonate dissolution endmember, and the longer distance from sulfuric acid dissolution endmember indicates the limited impact of sulfuric acid dissolution of carbonate rocks involved in groundwater inorganic carbon (DIC) and δ¹³C_DIC. Same as the situation of Sr²⁺/Ca²⁺ values, δ¹³C_DIC could reflect the run-off condition of groundwater to some degree. Using the stoichiometry method calculate, the average proportion of DIC(HCO₃^-_H₂SO₄) produced by sulfuric acid gained by stoichiometric relationship is 22.64%, accounts for 13.04%, while that produced by carbonic acid accounts for 86.96%, of which 43.48% comes from the soil atmosphere. Deducting DIC contribution of sulfuric acid to the groundwater, 13.04% karst carbon sink will be reduced.
- karst carbon sink,
- sulfuric acid,
- C isotope of dissolved inorganic carbon,
- Sr²⁺/Ca²⁺,
- Guilin karst area,
- groundwater

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References(57)

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Impact of Acid Rain to δ13CDIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin

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Impact of Acid Rain to δ¹³C_DIC of Karst Groundwater and Carbon Sink in Dry Season in Guilin