对冻期土壤的水分、温度和盐分的变化规律进行了定量测定,并对其在裸地与地膜覆盖地的运动规律进行了比较,得到了冻土水热盐运动的一些重要特性,冬季覆盖可提高土壤温度,保持较高的含水率,减少土壤表层含盐量,提出了冬季覆盖是防春旱、春寒和土壤次生盐碱化的较为有效的途径。 The change law of soil moisture, temperature and salinity in frozen soil was quantitatively measured. The law of its movement between bare land and plastic film was compared, and some important characteristics of the hydrothermal salt movement in frozen soil were obtained. In winter, It can increase soil temperature, maintain high water content and reduce salt content of soil surface. It is suggested that winter coverage is an effective way to prevent spring drought, cold spring and soil salinization.