渗水地膜覆盖原生盐碱荒地的土壤盐分运移数值模拟

基于渗水地膜覆盖条件下原生盐碱荒地土壤剖面盐分分布的年度跟踪观测试验,分析了地膜覆盖后土壤盐分的累积与运移特性,并根据土壤盐分运移的基本方程采用Bresler算法对渗水地膜覆盖后土壤盐分运移变化特性进行了数值模拟,经过和实测的对比分析认为该数值模拟方法是可行的。根据模拟结果和实测数据可知覆盖渗水地膜后可明显抑制土壤盐分的累积,另利用雨季的降水叠加可实现上层土壤的逐渐脱盐。

Numerical Simulation of Soil Salinity Migration in the Original Saline Wasteland Covering Water Permeability Plastic Membrane

Based on the tracking and monitoring experiment of the salinity distribution of soil profile in original saline wasteland covering water-permeability plastic film,the salinity accumulation and migration features of soil coving film were analyzed.Then,the soil salinity migration features coving film were simulated by the Bresler algorithm based on the salinity migration basic equation.By comparing and analyzing simulation value and measured one,a conclusion could be drawn that the numerical simulation method was feasible.According to the simulation results and measured data,the salinity accumulation could be restrained obviously by the water-permeability plastic film.At the same,the top soil would be desalted gradually under the rainfall overlaying in wet-season.