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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (3): 210-218.DOI: 10.7522/j.issn.1000-694X.2020.00011

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Relationship between precipitation and soil water storage and soil deep percolation in mobile sand land

Wu Lili1, Liu Danyi2, Yang Wenbin1, Wang Tao3, Li Wei1, Feng Jinchao1, Feng Wei4   

  1. 1. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China;
    2. China Sand Control and Sand Industry Society, Beijing 100714, China;
    3. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    4. Xilingol Vocational College, Xilinhot 026000, Inner Mongolia, China
  • Received:2020-01-02 Revised:2020-03-09 Online:2020-05-20 Published:2020-06-09

Abstract: Soil deep percolation is an important link of the water cycle in the near-terrestrial stratum, and it is one of the processes related to precipitation infiltration and groundwater recharge. In this study, the real-time monitoring of soil deep percolation of typical mobile sand land in Mu Us Sand Land was carried out by using the soil deep percolation recorder, the following conclusions were drawn:(1) The precipitation in the growing season of 2016 (from April 1 to October 31) was 1.93 times of that in 2017, while the percolation of 50, 100 and 200 cm sand layer were 4.53 times, 5.53 times and 5.22 times of the same period in 2017. The variation range of soil water storage in 2016 was also significantly larger than that in 2017. There was a good correspondence between the percolation and the peaks of rainfall and soil water storage. (2) For heavy rainfall, rainfall had a greater impact on the amount of deep percolation, and the change of soil water storage was closely related to the amount of deep percolation; for less rainfall, the relationship between soil water storage and deep percolation was more close. In the process of continuous rainfall, because deep percolation had hysteresis and delayed response to rainfall, in the deeper soil layer, percolation was usually the result of the accumulation of multiple rainfall processes, Taking soil water storage as an intermediate variable can better analyze the process of deep percolation. (3)The correlation coefficient between the water storage and the percolation on the next day was higher. At the same time, the deeper the soil layer was, the higher the correlation coefficient between deep percolation and soil water storage was. The linear fitting effect between the two were not that ideal.

Key words: precipitation, soil water storage, soil deep percolation, depth, mobile sand land

CLC Number: