不同灌溉方法对盐渍土壤中水、盐、热分布的影响

通过温室盐渍土壤中的种植试验,对常规灌溉、固定灌溉、交替灌溉3种灌水方式下水分、盐分、温度的变化情况进行了研究。结果表明,交替灌溉水分利用效率优于常规灌溉和固定灌溉;相同时间内交替灌溉的干燥沟升温幅度大于湿润沟,随着土壤深度的增加温度呈逐渐减小的趋势;常规灌溉土壤返盐最多,固定灌溉返盐最少。土壤水溶性盐、Cl-、Na+在土壤表层积聚现象明显。

Effects of Different Irrigation Treatments on Change of Water,Salt and Temperature and Corn Growth in Saline Soil

In the method of greenhouse cultivating,the corn growth and change of water,salt and temperature were studied in saline soil under normal irrigation,fixed irrigation and alternate irrigation.The results showed: in the course of corn growth,water use efficiency of alternate irrigation corn was the best in 3 irrigation methods.Temperature of dryness furrow was ascended more than wetness furrow in same time.Soil temperature was more and more low with the increasing of soil depth.The soil water-solubility salt content of normal irrigation was highest and the soil salt content of fixed irrigation was lowest.Soil water-solubility salt,Cl-and Na+ were accumulated in soil surface layer visibly.