大棚土壤水吸力研究

The study on Moisture Suction in Soil under Shed Protection

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．

This study dealt mainly with the dynamic variation of moisture suction in soil under shed protection in Harbin,Heilongjiang Province. The results showed that the bottom moisture suction in 0￣30cm was more than upper, which indicated that the movement of water was from bottom to upper. When moisture suction was 100￣400cm,the water was between field moisture capacity and capillary disrupting moisture, and the water was the most efficient. But this was affected by irrigation, which was only 41.8% of total water regime, and the rest was more or less, indicating that the water regime in soil under shed protection was not very well.