Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 240-246.doi: 10.13278/j.cnki.jjuese.201501206

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Applicability of Karst Carbon Sinks Calculation Methods in Semi-Arid Climate Environment

Huang Qibo1,2, Qin Xiaoqun1,2, Liu Pengyu1,2, Kang Zhiqiang3, Tang Pingping1,2   

  1. 1. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi, China;
    2. Karst Dynamics Laboratory, MLR & GZAR, Guilin 541004, Guangxi, China;
    3. Guangxi Geology Survey, Nanning 530023, China
  • Received:2014-03-06 Published:2015-01-26

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Abstract:

By choosing the appropriate method for accurately calculating the amount of karst carbon sink in arid and semiarid regions in Northern China, the estimation accuracy of China's karst carbon sink and global carbon cycle models can be improved. The results show that karst carbon sink intensity(1.821 t/(km2·a)) with the standard dissolution method is only 1/5 of that of the hydrochemistry-runoff method(9.83 t/(km2·a)) in the Mapao Spring Catchment, Shanxi Province by using the hydrochemical runoff method and standard dissolution method. The negative correlation between tablets dissolution rate and soil inorganic carbon further indicates that the high levels of soil inorganic carbon (2.85-5.06 times of organic carbon content) is the major cause for the smaller results by standard dissolution method. In semi-arid regions, the high inorganic carbon content was easily deposited, resulting in a low dissolution rate for the tablets. The water chemistry and flow is easy to be monitored for a clear boundary condition basin, so the results of karst carbon sink intensity with the hydrochemistry-runoff method is more accurate. Therefore, for calculating karst carbon sink intensity in the semi-arid regions, the hydrochemical-runoff method should be used.

Key words: karst carbon sink, hydrochemistry-runoff method, dissolution method, dissolution rate, semi-arid karst regions

CLC Number: 

  • P641.134

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