微咸水矿化度对秸秆还田下土壤水盐运移分布影响

Impact of Brackish Water Salinity on the Transport and Distribution of Soil Water and Salt Under the Condition of Straw-return

为了研究微咸水与秸秆还田的综合利用效应,在室内进行一维垂直入渗试验,分析了秸秆还田下不同矿化度对土壤水盐运移分布的影响。结果表明,相同入渗时间下,累积入渗量以矿化度3g/L为分界点随矿化度的升高先增后减,湿润锋的变化规律相似;土壤含水率随矿化度的增加表现出先增后减的趋势,以3和5g/L时土壤保持较高含水率;电导率随矿化度的增加而增加,当矿化度大于3g/L时,微咸水对土柱的淋洗作用不大。

In order to study the effect of the comprehensive utilization of brackish water and straw-return, soil water and salt trans port distribution under different salinity is analyzed through indoor one-dimensional vertical infiltration experiment. The results show that： with the increase of salinity, the cumulative infiltration will increase first and then decrease with 3 g/L salinity as a demarcation point, and the wetting front has the similar change rule; with the increase of salinity, soil water content shows a trend of first in- crease and then decrease, and maintain higher soil water content when salinity is 3 and 5 g/L; conductivity increases with the in- crease of salinity; when the salinity is greater than 3 g/L, the effect of desalination is not good for the soil column.