Chinese Geographical Science ›› 2021, Vol. 31 ›› Issue (4): 727-734.doi: 10.1007/s11769-021-1220-x

• Articles • Previous Articles    

The Effects of Groundwater Depth on the Soil Evaporation in Horqin Sandy Land, China

YANG Tingting1,2, ALA Musa1, GUAN Dexin1, WANG Anzhi1   

  1. 1. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110000, China;
    2. College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China
  • Received:2020-04-13 Published:2021-06-28
  • Contact: WANG Anzhi
  • Supported by:
    Under the auspices of the National Natural Science Foundation of China (No. 31770755, 31670712), Key Projects of Chinese Academy of Sciences (No. KFZD-SW-305)

Abstract: The interactions between groundwater depth and soil hydrological processes, play an important role in both arid and semi-arid ecosystems. The effect of groundwater depth on soil water variations were neglected or not explicitly treated. In this paper, we combine a simulation experiment and a water flow module of HYDRUS-1D model to study the variation in soil evaporation under different groundwater depth conditions and the relationship between groundwater depth and evaporation efficiency in Horqin Sandy Land, China. The results showed that with an increase in groundwater depth, the evaporation of soil and the recharge of groundwater decrease. In this study, the groundwater recharge did not account for more than 21% of the soil evaporation for the depths of groundwater examined. The soil water content at 60 cm was less affected by the evaporation efficiency when the mean groundwater depth was 61 cm during the experimental period. In addition, the evaporation efficiency (the ratio of actual evaporation to potential evaporation) decreases with the increase in groundwater depth during the experiment. Furthermore, the soil evaporation was not affected by groundwater when the groundwater depth was deeper than 239 cm.

Key words: groundwater depth, soil evaporation, evaporation efficiency, HYDRUS-1D