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Volume 35 Issue 2
Apr.  2016
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Article Navigation >  CARSOLOGICA SINICA  > 2016  >  35(2): 164-172
HUANG Qi-bo, QIN Xiao-qun, LIU Peng-yu, ZHANG Lian-kai, SU Chun-tian. Proportion of pedogenic carbonates and the impact on carbon sink calculation in karst area with semiarid environment[J]. CARSOLOGICA SINICA, 2016, 35(2): 164-172. doi: 10.11932/karst20160205
Citation: HUANG Qi-bo, QIN Xiao-qun, LIU Peng-yu, ZHANG Lian-kai, SU Chun-tian. Proportion of pedogenic carbonates and the impact on carbon sink calculation in karst area with semiarid environment[J]. CARSOLOGICA SINICA, 2016, 35(2): 164-172. doi: 10.11932/karst20160205
shu

Proportion of pedogenic carbonates and the impact on carbon sink calculation in karst area with semiarid environment

doi: 10.11932/karst20160205
  • 1.

    School of Environmental Studies,China University of Geosciences/Institute of Karst Geology, CAGS / Karst Laboratory of Karst Dynamics, MLR &GZAR

  • 2.

    Institute of Karst Geology, CAGS / Karst Laboratory of Karst Dynamics, MLR &GZAR

  • Publish Date: 2016-04-25
    Abstract
  • Quantitative evaluation of proportion and source of pedogenic carbonates in karst area with semiarid environment have contributed to understand the mechanism of soil system affecting karst process, which has great significance in karst carbon cycle research. Soil samples were collected from soil profile of forest land, abandoned farmland and brushland, in a typical small watershed in semi-arid area, southwest of Jinzhong basin, Shanxi Province, China, for analysis of content and δ13C of soil carbonates, content and δ13C of CO2 and δ13C of parent rocks, hence to explore their variation with depth and controlling factors, and quantify ratio of pedogenic carbonates in soil carbon. Results show that in the upper layer(0 to 50 cm), the content of soil carbonates and CO2 increase with depth, while the δ13C of soil carbonates and CO2 decrease with depth. In the lower layer (50-70 cm), the content of soil carbonates and CO2 decrease with depth, and the δ13C of soil carbonates and CO2 increase with depth. The content and δ13C of soil carbonates are mainly controlled by pedogenic carbonates proportion, while the content and δ13C of CO2 are mainly affected by atmospheric CO2 and soil CO2 generated by organic matter decomposition in the upper layer, and impacted by karst process in soil-rock interface in the lower layer. The average proportion of pedogenic carbonates is 52%, 42%, 32% for abandoned farmland, forest land and brushland, respectively. This paper confirmed that the lithogenic carbonates can transform to pedogenic carbonates in north karst area with semiarid environment.

     

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