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根据 1 997～ 1 998年观测资料 ,从热量平衡角度出发 ,论述了土壤深松保墒增墒的物理基础 ,初步探讨了深松条件下田间土壤有效水动态变化规律和保墒作用 .深松改变了近地层水热状况 ,导致土壤水分蒸发减少、土壤孔隙度增大 ,可接纳的天然降水增加 ,30～ 50 cm土层含水量比对照提高 2 0 %以上 ,产量平均提高 2 0 %～ 30 % .
According to the observation data from 1997 to 1998, the physical basis of soil moisture and soil moisture increase was discussed based on caloric balance, and the dynamics of soil available water under soil subsoiling condition and the effect of soil moisture conservation were discussed. The hydrothermal conditions near the formation caused the soil water evaporation to decrease, the soil porosity increased, and the admissible natural precipitation increased. The water content in the 30-50 cm soil layer was increased by 20% or more compared with the control and the yield was increased by 20-30% .