【摘要】 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 % .更多还原

【Abstract】 Based on the observational data of soil moisture in 1997-1998, the physical basis of deep tillage for moisture increase and reservation is discussed in view of heat balance. The dynamic change law of the available soil moisture and the moisture reserving effect of deep tillage are examined. The results show that deep tillage changed the water heat condition of the ground layer, led to the decrease of the soil moisture evaporation and the increase of the soil porosity and the available precipitation. Compared with the control field, the 30—50 cm water content increases by more than 20% and the yield increases by 20%—30% averagely.更多还原