PROGRESS IN GEOGRAPHY ›› 2021, Vol. 40 ›› Issue (10): 1704-1715.doi: 10.18306/dlkxjz.2021.10.008

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Quantifying the effect of drought with different durations on karst dissolution based on field control test

LI Kaizhong1,2(), XU Zhongchun3, LV Xiaoxi1,2, DONG Yingping1,2, WANG Hengsong1,2   

  1. 1. School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    2. State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China
    3. School of Public Administration, Guizhou University, Guiyang 550025, China
  • Received:2020-10-13 Revised:2021-06-22 Online:2021-10-28 Published:2021-12-28
  • Supported by:
    National Natural Science Foundation of China(41561047);National Natural Science Foundation of China(41561064);Doctoral Foundation of Guizhou Normal University(2012);Youth Fund for Humanities and Social Sciences Research of the Ministry of Education(18YJC630216);Guizhou Science and Technology Supporting Plan(2016-2841);The Project of Talent Introduction of Guizhou University(〔2015〕013)


Karst dissolution is one of the most fundamental processes in the karst area, which is closely related to water and extremely prone to the impact of drought. Previous studies have shown that drought has a significant impact on karst dissolution. However, the magnitude of drought impact is unclear, especially the karst dissolution loss caused by different intensities of drought. The present study used a field control test to quantify the effects of 12 different drought durations on karst dissolution for the forest, shrub grassland, and cropland in central Guizhou Province using the standard carbonate tablets method. We also analyzed the drought influence mechanism of karst dissolution. The results show that drought has caused enormous karst dissolution loss and the loss percentage ranges from 30.61% to 83.33% for the forest area, 38.45% to 88.82% for shrub grassland, and 66.76% to 95.14% for cropland, respectively. According to the loss data of different soil layers, the deeper soil layers have higher karst dissolution loss under the impact of shorter duration drought, while the surface soil layers have lower karst dissolution loss. However, under the influence of more prolonged drought, the karst dissolution loss of surface soil layers is higher than the deeper soil layers. The mechanism of influence of drought indicates that soil moisture was the leading cause of karst dissolution loss, which plays a crucial role in karst dissolution loss caused by drought.

Key words: drought, different durations, karst dissolution, loss, field control test, standard carbonate tablets