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主要研究了黑龙江省哈尔滨市一定点大棚内，其土壤水吸力的动态变化．研究表明：０～３０ｃｍ层次大棚土壤水吸力底层大于表层，表明土壤水分运动方向是从底层流向表层．水吸力在１００～４００×１０２Ｐａ时，土壤水分处于田间持水量到毛管断裂含水量之间，水分有效性最大．但受人工灌水方式的影响，这种情况只占水分状况的４１．８％，其余水分状况或多或少，表明大棚土壤的水分状况不理想．水吸力在４～１０月份的生长期内呈周期性变化．
The main study of Harbin City, Heilongjiang Province, a certain point within the greenhouse, the dynamic changes of soil water suction. The results showed that the bottom layer of soil water suction in 0 ~ 30cm greenhouse was larger than the surface layer, indicating that the direction of soil water movement was from the bottom to the surface. Water suction at 100 ~ 400 × 102Pa, soil moisture in the field to the water content of capillary fracture, the maximum water availability. However, affected by artificial irrigation methods, this situation accounted for only 41.8% of the water status, and the rest of the water status was more or less, indicating that the moisture content of greenhouse soil was not satisfactory. Water suction changes periodically from April to October.