Study on the dynamic characteristics of solid and liquid water in the process of freezing-thawing in black soil

Migration of solid and liquid water in black soil as well as soil temperature are studied with the method of Neutron Probe TDR during the soil freezing thawing-process. The results shows that the soil water content in the upper-layer increases 73.7 mm that accountes for 13.4% of annul rainfall,as a result of vertical water transportation from downside soil profile of 2 m depth in the freezing period. The content of solid water is driven by the soil temperature and content and the total water content arrives at a peak of 60% of total water during late February and early March. The content of liquid water decreases in the process,in which the lowest amount accounted for 40% of total water in the steady freezing process.