磁场强度对磁化水入渗和土壤水盐运移特征的影响

Effects of Magnetic Field Strength on Magnetized Water Infiltration and Soil Water and Salt Movement

为探明不同磁场强度对磁化水土壤水盐运移规律的影响,揭示磁化水淋盐增效机理,进行了室内一维垂直土柱入渗试验,研究了0、0.1、0.2、0.3、0.5 T磁场强度磁化水对土壤水盐运移特征的影响。结果表明:经磁化处理后,土壤水分入渗速率与湿润锋运移速率均有所降低,而上层土壤湿润体水分含量增加;随着磁场强度的增加,累积入渗量呈现先减后增的变化趋势,在磁场强度为0.3T时,累积入渗量减少幅度最大。磁场强度对磁化水土壤入渗参数具有显著影响,入渗模型吸渗率和饱和导水率与磁场强度之间存在较好的二次多项式关系,在磁场强度为0.28T时,吸渗率和饱和导水率均达到最小值。磁化水入渗能够提高水分在上层土壤中的滞留时间,提高上层土壤含水率,降低深层土壤水分入渗量;经磁化处理后,单位水体盐分淋洗量增加,脱盐率和脱盐强度显著提高,在磁场强度为0.3T时磁化水盐分淋洗效果最好。研究表明,磁场强度显著影响磁化水入渗和土壤水盐运移特征。

Magnetized water may improve the soil salt leaching efficiency.It is the basis for revealing the mechanism of salt leaching by magnetized water to explore the influence of magnetized water under different magnetic field intensity on the movement of soil water and salt.The effects of magnetized water with 0T,0.1T,0.2T,0.3T and 0.5T magnetic field intensity on the characteristics of soil water and salt transport were studied through one-dimensional vertical soil column infiltration test in the laboratory.The results showed that the soil water infiltration rate and the wetting front migration rate were decreased with irrigation by magnetized water,while the moisture content of the upper soil wetted zone was increased.With the increase of magnetic field intensity,the cumulative infiltration amount showed decreasing trend initially and then increasing.The cumulative infiltration amount was decreased the most when the magnetic field intensity was 0.3T.Moreover,the magnetic field intensity had a significant influence on the soil water infiltration parameters under the condition of magnetized water infiltration.The soil sorptivity S and saturated hydraulic conductivity Ks of the infiltration model showed the quadratic polynomial relationship with the magnetic field intensity,respectively.When the magnetic field intensity was 0.28T,both the soil sorptivity S and the saturated hydraulic conductivity Ks were minimized.In addition,magnetized water infiltration could increase the retention time of water in the upper soil,increase the water content of the upper layer soil,and reduce the water infiltration of deep soil.After the magnetization treatment,the salt leaching amount in unit volume of water was increased,and the desalination rate and magnetization desalination intensity were significantly improved.The magnetized water had the best effect on salt leaching when the magnetic field intensity was 0.3T.The results showed that the magnetic field intensity could significantly affect the characteristics of magnetized water infiltration and soil water and salt transport,which provided theoretical support and guidance for rational use of magnetized water in agricultural irrigation.