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通过室内试验,采用混合拌施的方法研究聚丙烯酰胺(PAM)对河套灌区非盐渍土、轻度及中度盐渍土基本物理性状及水分蒸发的影响,并评估轻度及中度盐渍土施用PAM在改善土壤物理性状及抑制土壤水分蒸发方面的作用效果。结果表明,经PAM处理后3种土的团聚体含量均高于对照并且随PAM浓度的加大其含量也呈上升趋势。同时,混施PAM后有效降低了3种土的容重,增大了孔隙度及毛管孔隙度,减少了3种土的水分蒸发,但并不是添加PAM的浓度越大越好。结果同时表明土壤中盐分的存在及含量会影响PAM对土壤物理性状及水分蒸发的作用效应。适量的盐分可以促进PAM与土壤颗粒的吸附行为,从而增强PAM对土壤的作用效应,但若盐分含量过多,则有可能削弱这种效果。
The effects of polyacrylamide (PAM) on the physical properties and moisture evaporation of non-saline soil, mild and moderate saline soil in Hetao Irrigation District were studied by laboratory tests and mixed-dressing methods. The effects of mild and moderate salt Effect of PAM on Soil Physical Properties and Soil Moisture Evaporation. The results showed that the aggregates content of three kinds of soils after PAM treatment were higher than that of the control and the content of aggregates also increased with the increase of PAM concentration. At the same time, PAM mixed effectively reduced the bulk density of three kinds of soil, increased the porosity and capillary porosity, reduced the evaporation of three kinds of soil moisture, but not the greater the better the concentration of PAM. The results also showed that the presence and content of salt in soil affected the effect of PAM on soil physical properties and water evaporation. The amount of salt can promote the adsorption of PAM and soil particles, thereby enhancing the effect of PAM on the soil, but if the salt content is too much, it may weaken this effect.