Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (2): 179-188. doi: 10.11867/j.issn.1001-8166.2018.02.0179

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Chemical Weathering and CO 2 Consumption of Chishuihe River Basin, Guizhou Province

Yanling An 1, 2( ), Jiemei Lü 2, 3, Jin Luo 3, Qixin Wu 2, 3, Li Qin 2   

  1. 1.Guizhou Institute of Technology, Guiyang 550002, China
    2.Key Laboratory of Karst Environment and Geohazard Prevention, Guizhou University, Guiyang 550025, China
    3.College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
  • Received:2017-08-09 Revised:2017-12-01 Online:2018-02-20 Published:2018-04-02
  • About author:

    First author:An Yanling (1975-), female, Tongliao City, Inner Mongolia Autonomous Region, Professor. Research areas include water environment of river

  • Supported by:
    Project supported by the National Natural Science Foundation of China “CO 2 emissions across typical karst stream and river surfaces:A case study at the upper reaches of Maotiaohe”(No.42603123);The Foundation of Guizhou Province “The influence of water and soil erosion process to output of nitrogen and phosphorus at Chishui River”No.Qiankehe LH[2016]7457)

Yanling An, Jiemei Lü, Jin Luo, Qixin Wu, Li Qin. Chemical Weathering and CO 2 Consumption of Chishuihe River Basin, Guizhou Province[J]. Advances in Earth Science, 2018, 33(2): 179-188.

Carbon sink produced during rock weathering is critical to global carbon cycles. In this work, we analyzed the major ion chemistry of the Chishuihe River Basin, and the major ion composition of the Chishuihe River system and the principal component analysis was applied for estimating the weathering rate and atmospheric CO2 consumption via the rock chemical weathering. The results demonstrated that the chemical composition of the river was dominated by Ca2+, Mg2+, HC and S. The average concentration(317.88 mg/L) of the total dissolved solids within the Chishuihe River was higher than the average value (65 mg/L) of world rivers. The Gibbs graph combining major ion element ratio analysis indicated that the catchment major ion composition mainly originated from rock weathering, primarily from carbonate weathering, sparsely from silicate weathering. Carbonate and silicate weathering contributed 70.77% and 5.03% separately to the dissolved loads. The anthropogenic and precipitation impact was limited. According to calculation based on principal component and the ion composition characteristics, the chemical weathering rate was 126.716 t/(km2·a), significantly higher than that of the Yellow River and Yangtze River, and also higher than the average rate of the global major rivers. The CO2 consumption flux based on annual average runoff was 10.96×109 mol/a, and the CO2 consumption rate by chemical weathering was 5.79×105 mol/(km2·a).

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