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Identification of Soil Water Migration and Recharge Sources in The Southern Marginal Zone of the Junggar Basin, China

SUN Fangqiang,YIN Lihe,MA Hongyun,ZHANG Jun,WANG Xiaoyong,  DONG Jiaqiu,HE Shuaijun   

  1. Key Laboratory of Groundwater and Ecology in Arid and Semi-arid Region /Xi‘an Center,China Geological Survey,Xi ‘an,710054 ,Shanxi,China)
  • Received:2016-12-03 Revised:2017-04-27 Online:2017-11-15 Published:2017-12-20

Abstract: Abstract:Soil water is the basis of all terrestrial plants in desert area. Investigation on the migration patterns of soil water is necessary for identifying the recharge sources of soil water and for the ecological regeneration in desert area. In this paper, the origin and migration patterns of soil water in a desert area in the southern marginal zone of the Junggar Basin were investigated based on measuring soil moisture content, stable isotopes (δD and δ18O) of soil water and soluble salt ions. The results indicated that the vertical profiles of stable isotopes, water content and soluble salt ions of soil water were in a cyclic variation. The Cl- composition in soil was positively correlated to soil moisture content. The influencing depth of evaporation was 0-1.6 m; soil water in a deep range of 1.6-8.0 m moved downward, and soil water below 8.0 m was influenced by groundwater. The vertical variations of stable isotopes and Cl- composition in soil water indicated that soil water originated from precipitation in desert area. The low values of Cl- composition corresponded to the depleted values of δD and δ18O; δD of soil water varied from -124.10‰ to -97.39‰, which suggested that soil water originated from precipitation or snow melt winter.

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