聚丙烯酰胺对盐渍化土壤水分垂直入渗特性的影响

The Influence of Polyacrylamide on Vertical Infiltration Characteristics of Saline Soil

为了探明聚丙烯酰胺(PAM)对盐渍化土壤水分入渗性能及变化过程的影响,通过室内模拟入渗试验,比较分析了不同盐分含量、不同PAM掺量处理的盐渍化土壤水分的入渗速率、累计入渗量及湿润锋等的动态变化。结果表明:(1)经PAM处理的盐渍化土壤入渗速率随PAM浓度的增大而显著减小;(2)对于重度盐渍化土壤,PAM掺量的多少对累计入渗量的影响不显著,而非盐渍化土壤、轻度盐渍化及中度盐渍化土壤均随着PAM浓度的增大而显著减小;(3)对于盐分含量不同的土壤,在同一PAM处理水平下,入渗速率、累计入渗量及湿润锋总体呈现随着盐分增加而减小的趋势;(4)土壤含水率随着PAM掺量及盐分含量的增加而增加的趋势,而对于重度盐渍化土壤PAM施用量之间的差异同样不显著。

In order to study the influence of polyacrylamide（PAM）on capability and process of infiltration in saline soil,this study investigated the dynamic changes of infiltration rate,cumulative infiltration and wetting front of soil with different salt content and different dosage of PAM through laboratory infiltration experiment.The main results are as follows：（1）Infiltration rate decreased with the increase of PAM dosage added in soil.（2）Cumulative infiltration was not significantly affected by the addition amount of PAM for severe salinization soil,while it decreased with the increase of PAM dosage for non-salinization,mild salinization and moderate salinization soil.（3）For the soil with the same addition amount of PAM,infiltration rate,cumulative infiltration and wetting front generally decreased with the increase of soil salt content.（4）Soil moisture content increased with the increase of PAM dosage and salt content in soil but was not significantly affected by the addition amount of PAM for severe salinization soil.