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Volume 38 Issue 5
Oct.  2019
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Article Navigation >  CARSOLOGICA SINICA  > 2019  >  38(5): 722-728
REN Jiaojiao, ZHOU Yunchao, LIU Bing, ZHANG Chunlai. Study on aggregate formation mechanism of soil in limestone[J]. CARSOLOGICA SINICA, 2019, 38(5): 722-728. doi: 10.11932/karst2019y17
Citation: REN Jiaojiao, ZHOU Yunchao, LIU Bing, ZHANG Chunlai. Study on aggregate formation mechanism of soil in limestone[J]. CARSOLOGICA SINICA, 2019, 38(5): 722-728. doi: 10.11932/karst2019y17
shu

Study on aggregate formation mechanism of soil in limestone

doi: 10.11932/karst2019y17
  • 1.

    Research Center of forest resources and environment of Guizhou province of Guizhou University / Forestry College of Guizhou University, Guiyang, Guizhou 550025, China

  • 2.

    Chinese Karst Geological Research Academy of Geological Sciences Institute of Ministry of land and resources, the Guangxi Zhuang Autonomous Region Karst Dynamics Laboratory / UNESCO International karst research center, Guilin，Guangxi 541004, China

  • Publish Date: 2019-10-25
    Abstract
  • Soil aggregate is the most basic structural unit of soil. To understand the formation mechanism of soil aggregate developed from limestone in karst areas, soil samples were collected from Huaxi District of Guiyang City for analysis. Using dry and wet sieving methods, the grading of aggregate particles for the soil samples were examined. The changes of the aggregate particle fractions and the ion content for calcium, magnesium, iron and aluminum ions of the split organic matter with these ions were compared. The results show that the soil aggregate is formed by fine particles generated by the combination of organic matter with calcium, magnesium, iron and aluminum ions, which furtherly forms bigger aggregate with larger particle size, finally develop to complete aggregate texture of bonded soil grain or other aggregate by the molecular force. The major cementing material of aggregate is the combination organic matter and calcium ion, followed by magnesium and iron ion. The bonding between organic matter and aluminum ions is not significant, which is because that limestone is dominated by calcium carbonate. Consequently, soil in the study area has relatively high content of soil aggregate with big grain size and higher water stability, thus its capability of erosion resistance is strong.

     

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