劣质水灌溉条件下砂壤土盐碱化研究

天津市水资源短缺,污水排放量大、回用率低,污灌年限长,土壤盐碱化复杂多样、程度高,采用室内模拟的方法,研究利用典型劣质水灌溉砂壤土后,土壤中盐分的迁移变化。结果得出,劣质水灌溉后土壤的pH值低于清灌,全盐量、SAR、ESP稍高于清灌。在小麦根系活动层,清水灌溉后,砂壤土由中度碱化土减轻为非盐碱土和轻度碱化土;劣质水灌溉后,土壤由中度碱化土减轻为轻度碱化土和中度碱化土。

Effect of Marginal Water Irrigation on Salinization of Sand Loam

Tianjin suffers from the shortage of water resources,the large wastewater emission,the low recycle rate of water,the long time of sewage irrigation and complex and serious soil salinization,a marginal water irrigation test was carried out to analysis salt transfer and its effect on Sand Loam through the theoretical analysis and indoor experiment method.The results were as follows:after marginal water irrigation,pH was lower than fresh water’s,but the total salt concent、SAR and ESP were higher than fresh water’s.In the in wheat root levels,after fresh water irrigation,sand loam reduced to non-saline soil and mild alkaline soil from moderate alkaline soil;after marginal water irrigation,sand loam reduced to mild alkaline soil and moderate alkaline soil from moderate alkaline soil.