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在新疆石河子121团膜下滴灌棉田进行了野外实验,共设置裸地和覆膜地2种处理地块,各个地块每次取土设3个重复,用烘干法测土壤含水率同时采用电导率仪测定土壤浸提液的电导率,然后换算成土壤的总含盐率。通过覆膜地与裸地的对比,分析了滴灌棉田有无积雪覆盖条件下水盐变化特征。结果表明,覆膜地土壤含水率与裸地变化规律类似,但变化幅度总体上小于裸地。在冻结期,覆膜有利于阻止盐分上移,而在融雪期,覆膜更易造成土壤盐分表聚。
Field experiments were carried out in the cotton field of 121 groups of Shihezi in Xinjiang. Two kinds of plots were set up in bare land and mulched land. Three plots were taken from each plots in each plots. Soil moisture content was measured by drying method The conductivity meter measures the conductivity of the soil extract and is then converted to the total salt content of the soil. By comparing the plastic film with the bare land, the change characteristics of water and salt under drip irrigation cotton field with or without snow cover were analyzed. The results showed that the soil moisture content of the mulched film was similar to that of bare land, but the variation range was generally smaller than that of bare land. In the freezing period, the film is conducive to stop the salt up, and in the snowmelt, the film is more likely to cause soil salinity table poly.