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Volume 40 Issue 5
Oct.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(5): 825-834
SUN Ping’an,XIAO Qiong,GUO Yongli,et al.Carbonate dissolution rate and karst carbon sink in mixed carbonate and silicate terrain：Take the upper reaches of the Lijiang river basin as an example[J].Carsologica Sinica,2021,40(05):825-834. doi: 10.11932/karst20210509
Citation: SUN Ping’an,XIAO Qiong,GUO Yongli,et al.Carbonate dissolution rate and karst carbon sink in mixed carbonate and silicate terrain：Take the upper reaches of the Lijiang river basin as an example[J].Carsologica Sinica,2021,40(05):825-834. doi: 10.11932/karst20210509
shu

Carbonate dissolution rate and karst carbon sink in mixed carbonate and silicate terrain：Take the upper reaches of the Lijiang river basin as an example

doi: 10.11932/karst20210509
  • 1.

    Institute of Karst Geology，CAGS/Key Laboratory of Karst Dynamics，MNR & GZAR， Guilin， Guangxi 541004， China

  • 2.

    State Key Laboratory of Biogeology and Environmental Geology，School of Environmental Studies，China University of Geosciences（Wuhan），Wuhan，Hubei 430074， China

Funds:

 KY201802009

 DD20190022

 132852KYSB20170029-01

 2018GXNSFDA050002

  • Received Date: 2021-03-30
  • Publish Date: 2021-10-25
    Abstract
  • The chemical weathering of carbonates is faster than silicates， and the contribution of carbonate mineral weathering to river water chemistry is dominant in the mixed carbonate and silicate terrain. In order to study the characteristics of carbonate weathering and karst carbon sink in the mixed carbonate and silicate terrain， 24 standard dissolution samples were placed at the Darongjiang river， the Xiaorongjiang river and Lingqu basins in the upper reaches of the Lijiang river basin and the physical and chemical properties of the corresponding soil were tested. Based on the dissolution amounts and soil physical and chemical characteristics during the rainy season and the whole year，the main controlling factors and seasonal differences of the dissolution amounts are analyzed， and the intensities of karst carbon sink in Darongjiang river， Xiaorongjiang river and Lingqu basins are quantitatively evaluated. The results show that the dissolution amounts of aerial samples are mainly controlled by rainfall. While the dissolution amounts decreased significantly when the vegetation partly blocks the rainfall， the surface and subsoil dissolution amounts are controlled by both rainfall and hydrological processes. The dissolution rate is bigger in rainy season， and the aerial samples are mainly controlled by rainfall， while the surface and subsoil samples are mainly controlled by soil moisture changes. Based on the dissolution of carbonate tablet， the karst carbon sink intensities in the the Darongjiang river， the Xiaorongjiang river and Lingqu basins are respectively 0.75，0.30 and 2.92 tC⋅km-2⋅yr-1.

     

    • SUN Ping’an,XIAO Qiong,GUO Yongli,et al.Carbonate dissolution rate and karst carbon sink in mixed carbonate and silicate terrain：Take the upper reaches of the Lijiang river basin as an example[J].Carsologica Sinica,2021,40(05):825-834.
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