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采用一维对流-水动力弥散方程（CDE）研究了非反应性化学物质在土壤中的迁移行为。通过实验研究了土壤团聚体大小和孔隙水流速对非反应性物质在土壤中迁移的影响。结果表明，对流-水动力弥散方程能较好地预报氚（3H2O）的穿透曲线和迁移行为，随着团聚体由小变大，3H2O在其土壤中的穿透曲线的溶质出流提前，而淋洗结束推迟，峰值变小，最佳拟合D值由小变大。流速增加，D值增大，扩散现象加剧，D和流速呈正比。这为进一步研究反应性农用化学物质在该土壤中的迁移行为，预报溶质在土壤中的迁移及其命踪创造了条件。
A one-dimensional convection-hydrodynamic dispersion equation (CDE) was used to study the migration of non-reactive chemicals in soils. The effects of soil aggregate size and pore water velocity on the migration of non-reactive substances in soil were studied experimentally. The results show that the convection - hydrodynamic dispersion equation can predict the breakthrough curve and migration behavior of tritium (3H2O) well. As the agglomerates change from small to large, the flux of 3H2O in the breakthrough curve of soil reaches earlier, However, the end of rinsing was delayed and the peak value became smaller, and the best fitted D value increased from small to large. Flow rate increases, D value increases, the phenomenon of proliferation, D and flow rate is proportional to. This is to further study the migration behavior of reactive agrochemicals in this soil and to predict the migration of solute in the soil and its tracing.