水质对饱和土壤盐分淋洗效率的影响

设置不同的水质(钠吸附比SAR和盐分摩尔分数)处理,通过室内小土柱试验,研究水质对两种土壤水力传导度和盐分淋洗效率的影响。结果表明,水力传导度随着灌溉水的钠吸附比的增加和C的减小而减小;当水力传导度很小时,盐分不能完全穿透土柱,相对盐分摩尔分数小于1;水质对盐分淋洗量的影响不大,置换土壤中的盐分大约需要8到10个孔隙体积的水量;水质对盐分淋洗时间的影响很大,不同水质置换相同的盐分时间可以相差10倍以上。

Effect of Water Quality on Salt-leaching Efficiency of Saturated Soil

The effect of water quality(Sodium adsorption ration SAR and electrolyte concentration C) on saturated hydraulic conductivity(HC) and salt-leaching efficiency of disturbed smectitic silt loam and silt clay loam were studied with the laboratory columns experiments.The results indicated that the HC of the soil decreased with a decrease in electrolyte concentration and an increase in the SAR of the solutions;when the soil had the lower hydraulic conductivity,salt can not break through the soil columns completely,therefore the value of relative electrolyte concentration can not reached and far less than 1;Water required by salt leaching was 8-10 pore volumes under the different water quality treatment;while water quality can significant affect the salt leaching time,and the time of salt leaching has about 10 times difference under the different treatment.