CaSO_4在改良碱化土壤过程中对其理化性质的影响

通过室内土柱混合置换试验探讨了不同CaSO4浓度水平下土壤淋溶液的理化性质的变化规律。试验设置2个处理,CaSO4浓度分别为0.5 g/L和1.5 g/L。结果表明:碱化土壤经过不同浓度的CaSO4溶液淋溶,土壤的pH值、电导率和饱和水力传导度得到了不同程度的降低,同时,CaSO4溶液浓度高的淋溶效果要比浓度低的变化明显。在土壤表层,2种处理的pH分别由初始的9.71和9.26降低到8.06和8.03;电导率分别由初始的14.49ds/m和14.39 ds/m降低到0.82 ds/m和1.67 ds/m。这说明土壤的理化性质得到了改善,碱化土壤改良效果显著。

Effects of CaSO4 on the Physical and Chemical Properties of Sodic Soil as an Amendment

A miscible displacement experiment of soil column was conducted to study the change of physical and chemic characters of the soil leachate under different CaSO_4 solution concentration levels.There were two treatments designed in this experiment.As it was turned out,pH value,electric conductivity and saturated hydraulic conductivity were decreased with leached by different CaSO_4 solution concentration levels,Meanwhile,the effect of high CaSO_4 solution concentration were much better than that of the low concentration.On the surface layer,pH of two treatments had dropped to 8.06 and 8.03 from initial 9.71 and(9.26,) respectively and electric conductivity had decreased from 14.49 ds/m and 14.39 ds/m to 0.82 ds/m and 1.67 ds/m.This indicate that the physical and chemical characters of the soil were improved,and the effect of improvement of sodic soil were remarkable.