沙粒对碱土饱和导水率和盐分淋洗的影响

Effect of Sand on Saturated Hydraulic Conductivity and Salts Leaching of Sodic Soil

为探求碱土饱和导水率与出流液电导率及pH之间的关系,采用室内模拟实验对含沙粒碱土的饱和导水率、出流液电导率及pH进行测定,分析了沙粒添加量和粒径对碱土饱和导水率、出流液电导率及pH的影响。结果表明:随沙粒添加量逐渐增加,碱土饱和导水率不断升高,两者呈极显著指数关系;碱土饱和导水率随沙粒粒径增加呈无规律的变化趋势;出流液电导率和pH值随沙粒添加量增加而降低,电导率和沙粒添加量间存在指数函数关系,但pH与沙粒添加量间无函数关系;出流液电导率和pH值随沙粒粒径增加均呈无规律变化趋势;出流液电导率和pH值均随饱和导水率的升高而降低,二者与饱和导水率间均呈对数关系。

On the bases of simulation experiments in laboratory, the effects of sand fragments and sand sizes on saturated hydraulic conductivity （K,10） of sodic soil, electrical conductivity （EC） and pH of leachates were investigated, and relationships between K,10 and EC of leachates, K,10 and pH of leachates were established. Results showed that K,10 increases with the increments of sand fragment, and the relationships between them follow exponential functions. The saturated hydraulic conductivity varies with the increases of sand sizes. The values of EC and pH of leachates decrease with the increases of sand fragments, and relationships between EC and sand fragments follow exponential functions, while no functions were found between pH and sand fraction. Both EC and pH of leachates are various with the increments of sand sizes, but trends of leachate EC are similar to those of leachate pH varying with the increases of sand sizes. The EC and pH values decrease with the increases of K,, and relationships between EC and Ks10, pH and Ks10 follow logarithmic functions.