Abstract
A practical survey on the precipitation, soil water and groundwater transformation was carried out in the cold and dry field. The neutron probe experiment plot was set up for the measuring of the triple waters transformation at Molimiao Farm of Tongliao City, Inner Mongolia Autonomous Region of China. The systematic observations at five sites were carried out from July, 1991 to September, 1992. The results obtained are as follow:(1) The groundwater movement fluctuated with rainfall, evaporation, and freezing and thawing. The variation scale was greatly influenced by the depth of groundwater, the vegetation and landscape; the influence of formation and clay layers in the unsaturated zone also played an important roles.(2) Water storage in the unsaturated zone during the freezing and thawing period varied in intensity from sudden decrease to slow reduction and slight increase, to great reduction and to variable reduction. The maximum storage in the unsaturated zone showed variance from increase to reduction.(3) The soil moisture content during the freezing period increased in frozen soil file period, and decreased in unfrozen soil file. However, there were different characteristics in the groundwater movement that could be found during thawing period due to the impacts of clay layers in unsaturated zone.
