施钙浓度对滴灌盐碱土水盐运移特征研究

Water and Salt Transport Characteristics for Use-calcium Concentration Through Drip Irrigation

针对西北等干旱地区土地次生盐渍化的问题,以室内试验为基础,测定盐碱土在不同滴灌施钙浓度下水盐运动过程,研究了不同施钙浓度对盐碱土土壤盐分运移和水分运动的影响。结果表明,不同施钙浓度的湿润锋水平、垂直最大运移距离与钙离子浓度之间均符合线性关系,湿润锋的水平、垂直运移距离与入渗时间之间符合幂函数关系,随着湿润锋水平、垂直湿润距离的增加,不同滴灌施钙浓度的土壤含盐量、钠离子含量均在不断增加,随着施钙浓度的增加,脱钠区深度系数增大,脱盐效果明显。

For solving salt-affected land problem in arid area, based on experiments, the movement of soil water from drip irrigation was measured in saline-alkaline soil under different drip irrigation calcium-use concentration. The affection and variation of soil water movement and solute was studied under different drip irrigation calciumuse concentration. The results showed that the use-calcium concentration was the good line function of the maximal horizontal and vertical advance distance, the horizot.tal and vertical advance distance of soil wetted front was the good power function of infiltration time for different use-calcium concentration. The horizontal and vertical advance distance of soil wetted front were increased, soil salinity and sodium content were increasing. In all treatments, the use-calcium concentration were increased, the depth of the sodium desalinization zone coefficients were increasing, the desalinization effect was distinct. The result of study has certain guidance functions to the utilization of salinity under drip irrigation.