Simulation and verification of two-dimensional numerical simulation model of soil water infiltration under straw mulch

The paper described the physical process of soil water infiltration under conservation tillage. Base on soil water dynamics equations, the two-dimensional model of root water absorption and soil water infiltration was established to simulate soil water infiltration under full straw mulch. By alternating direction implicit algorithm for these models, the simulations of soil water were performed under full straw mulch at corns in the Liaoling province. Appeared the dynamic changes of soil moisture of field process by the numerical simulation on rainfall infiltration through the soil. The results showed that simulated values is in good agreement with the observed values, and the average relative error between simulated and observed values was under5%. The two-dimensional model of soil water infiltration can be used to research on movement of soil moisture and soil moisture in the forecast for conservation tillage.