添加化学改良剂的砂质盐碱土入渗特征试验研究

The Studies of Infiltration Characteristics on Sandy Saline Alkali Soil by Chemical Amelioration

采用表施PAM(0.01%,0.04%,0.08%)和旱地龙(75,150,375g/m2)下不同施量对其一维垂直积水入渗进行研究,结果表明,施加化学改良剂起到减渗作用,且随施量的增加累积入渗量与湿润深度均呈先降低后升高的趋势,PAM、旱地龙施量分别在0.04%,150g/m2时累积入渗量与湿润深度均达最小;土壤含水率在5-30cm土层较高且稳定,相应的最大脱盐区则出现在10-22.5cm土层内,PAM施量在0.04%,旱地龙施量在150g/m2下土层的持水效率最高,盐分淋洗总量最大。

In the process of one-dimensional infiltration on applied chemical amelioration, experiment designed surface application（PAM dosage was 0.01%, 0.04% and 0.08%, respectively Handilong dosage was 75, 150, 375 g/m2 ）. The results showed that chemical amelioration played a role of reducing infiltration, cumulative infiltration and wetness depth showed a trend which first decreased and then increased with the increase of the application amount of chemical amelioration. And cumulative infiltration and wetness depth were lowest, highest in soil holding water efficiency and biggest in salt leaching amount with 0.04% PAM and 150 g/m2 Handilong. The soil moisture content was stable in 5--30 cm soil layer, accordingly the largest desalination region in 10--22.5 cm soil layer.