Advances in Earth Science ›› 2017, Vol. 32 ›› Issue (3): 307-318. doi: 10.11867/j.issn.1001-8166.2017.03.0307

• Orginal Article • Previous Articles     Next Articles

The Influence of Allogenic Water and Sulfuric Acid to Karst Carbon Sink in Karst Subterranean River in Southern Hu’nan

Qibo Huang 1, 2, 3( ), Xiaoqun Qin 2, 3( ), Pengyu Liu 2, 3, Liankai Zhang 2, 3, Chuntian Su 1, 2, 3   

  1. 1.Environmental School,China University of Geosciences, Wuhan 430074, China
    2.Institute of Karst Geology, Chinese Academy of Geological Sciences,Guilin 541004, China
    3.Karst Laboratory of Karst Dynamics, Ministry of Land and Resources & Guangxi Zhuang Autonomous Region, Guilin 541004, China
  • Received:2016-11-14 Revised:2017-02-03 Online:2017-03-20 Published:2017-03-20
  • About author:

    First author:Huang Qibo(1982-), male, Pingxiang City, Jiangxi Province, Associate Professor. Research areas include karst geo-hydrology and Karst environment with global

  • Supported by:
    Project supported by the China Geology Survey “Hydrogeological and environmental geological survey of 1∶ 50 000 in peak-forest karst area of the middle and lower reaches of the Xijiang River Basin” (No.121201107000150005);The National Natural Science Foundation of China “Seasonal different and influence mechanism of the dissolution in the semi-arid karst area”(No.41302211)

Qibo Huang, Xiaoqun Qin, Pengyu Liu, Liankai Zhang, Chuntian Su. The Influence of Allogenic Water and Sulfuric Acid to Karst Carbon Sink in Karst Subterranean River in Southern Hu’nan[J]. Advances in Earth Science, 2017, 32(3): 307-318.

Evaluating the impact of allogenic water and sulfuric acid on karst carbon sink not only helps to improve the accurate calculation of soil CO2 uptake by rock weathering, but also obtains a complete understanding of the global carbon cycle. Groundwater samples were collected from four karst subterranean rivers watershed within different lithology strata in Wushui Basin, upstream of Beijiang Basin, Hunan Province, for revealing the important impact of silicate weathering on hydrochemistry of groundwater. To estimate the contribution of soil CO2 uptake by silicate weathering to CO2 uptake by rock weathering, the Galy model was employed in this article. The important impact of sulfuric acid on CO2 uptake by carbonate weathering resulting from the substitution of carbonic acid by protons from sulfuric acid was investigated. Our results showed that the concentration of Na+, K+ and SiO2 in L01,L02 subterranean river with silicate strata in watershed were higher than that in L03,L04 subterranean river without silicate strata in watershed, which implied that the contribution of silicate weathering to Na+,K+ and SiO2 was very important in watershed within silicate strata . The changeable equivalent ratio between (Ca2++Mg2+) and HCO3- was 1.05 to 1.15, and the value of [Ca2++Mg2+]/[HCO3-+SO42-] was 0.99 to 1.08. The concentrations of Ca2+ and Mg2+ exceeded the equivalent concentrations of HC3-, and the excess of Ca2+ and Mg2+cations were compensated by SO42-, which suggested that sulfuric acid has an important influence on carbonate dissolution. The contribution of soil CO2uptake by silicate weathering to CO2 consumption in L01 and L02 subterranean river were 3.36% and 2.22%, respectively, whereas the contribution in L03, L04 subterranean river were less than 0.50%, indicating that the contribution of soil CO2 uptake by silicate weathering was important in the subterranean river basin within silicate strata. Due to the contributions made by sulfuric acid, the CO2 consumption in four subterranean rivers decreased by 4.84%, 4.52%, 6.20%, 9.36%, respectively.

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