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Characteristics of soil moisture in artificial impermeable layers.

SUO Gai-di1, XIE Yong-sheng1,2, TIAN Fei1, CHUAI Jun-feng1, JING Min-xiao1   

  1. (1College of Resources and Envaronment, Northwest A&F University, Yangling 712100, Shaanxi, China; 2Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, Shaanxi, China)
  • Online:2014-09-18 Published:2014-09-18

Abstract:

For the problem of low water and fertilizer use efficiency caused by nitrate nitrogen leaching into deep soil layer and soil desiccation in dryland apple orchard, characteristics of soil moisture were investigated by means of hand tamping in order to find a new approach in improving the water and fertilizer use efficiency in the apple orchard. Two artificial impermeable layers of red clay and dark loessial soil were built in soil, with a thickness of 3 or 5 cm. Results showed that artificial impermeable layers with the two different thicknesses were effective in reducing or blocking water infiltration into soil and had higher seepage controlling efficiency. Seepage controlling efficiency for the red clay impermeable layer was better than that for the dark loessial soil impermeable layer. Among all the treatments, the red clay impermeable layer of 5 cm thickness had the highest bulk density, the lowest initial infiltration rate (0.033 mm·min-1) and stable infiltration rate (0.018 mm·min-1) among all treatments. After drywet alternation in summer and freezingthawing cycle in winter, its physiochemical properties changed little. Increase in years did not affect stable infiltration rate of soil water. The red clay impermeable layer of 5 cm thickness could effectively increase soil moisture content in upper soil layer which was conducive to raise the water and nutrient use efficiency. The approach could be applied to the apple production of dryland orchard.