土壤水盐运移规律的试验研究

Experimental Study on Transportation Law of Water and Salt in Soil

土壤水、盐运移规律的研究是农田水利、水土环境等领域的重要基础内容。对不同节水措施(覆膜灌溉、浅湿灌溉、浅水灌溉)下水田土壤中的水盐运移规律和对冬季不同积雪深度及施盐情况下春季土壤水盐垂直分布规律进行测定与分析。土壤盐分测定采用电导率法,土壤水分测定采用烘干法。结果表明:天津市西青区土壤电导率变化趋势大致一样,在50 cm以上的土层电导率是逐渐变小,50 cm以下的土层电导率基本就没有太大变化,地表的盐分随着淋溶过程运移到地下,导致地表的电导率值变小。

The study on the transportation law of soil water and salt is the important basic content of the water and soil environment field. In this paper, the migration law of water and salt in paddy soils under the condition of different saving water measures, such as the plastic film irrigation, the shallow wet irrigation and the shallow water irrigation, is studied, and the vertically distributional of the water and salt in soil in spring is measured and analyzed. The soil salinity is measured by the conductivity method and the Soil moisture is measured by the drying method. The results shows that the trend of soil electroconductibility is the same in Xiqing District of Tianjin; the electroconductibility of soil layer above 50 cm is gradually reduced, while the electroconductibility of soil layer below 50 cm changes not much; the salinity of the surface is migrated to the ground during the leaching process, so the electroconductibility of the surface becomes smaller.