在我国典型寒区哈尔滨地区,以初冻期的包气带土壤作为研究对象,在对土壤基本性质分析的基础上,利用烘干法测定不同埋深土壤含水率,试验分析得到初冻期土壤剖面含水率大致呈大小大的变化特点,随着土壤中水分的冻结,土壤中的水分向冻层迁移,冻层中含水率增大较明显。土壤冻结过程强烈依赖于土壤温度,由土壤垂向含水率变化曲线可见:埋深O~20cm土壤因受到外界降水、蒸发影响土壤含水率变化明显,埋深20-40cm土壤含水率较其它各层大,埋深40-80cm的含水率则趋于一致。以此为哈尔滨地区乃至寒区冬季冻结土壤的水分迁移研究提供科学依据。
Harbin is a studied. Based on soil experimental indicates Soil water transfers to typical city in cold region, soil water content of Harbin in early freeze period is properties, and water content of different depths by stove method. Analysis of the water content of section decreases first and then increases as the depth rising. the froze layer as the temperature falls below 0℃, which contributes to the water rising in frozen layer. Soil freezing process is highly dependent on the soil temperature. From the vertical changes of soil moisture content curve can be seen, 0-- 20 cm the surface moisture content changes significantly due to precipitation, evaporation of outside world, 20-40 cm layer of soil water content than other, 40-80 cm moisture convergence. This experiment provides a scientific basis for water transfer of frozen soil in Harbin region and the cold region in winter.