SIMULATION OF ULCH EFFECTS ON SOIL TEMPERATUREAND MOISTURE REGIMES PART II: FINITE ELEMENTANALYSIS AND APPLICATION
不同覆盖条件对土壤水热分布影响的计算机模拟Ⅱ——有限元分析及应用

On the basis of the mathematical model was developed in part I, the governing equations were solved by the Galerkin-type finite element approach, together with the Douglas-Dapout Prediction-Correction method which have the advantage of less computer time than the itera-tive procedure for nonlinear problems. A simulation program for the influence of mulches on the seedbed moisture and heat behaviour was compiled and validated with the field experiment. Preliminary application of the program in analyzing the influence of the clear polyethylene film, oil paper and wheat straw on with different mulching technologies on seedbed moisture and temperature regimes put forth the following findings: (1) Transparent PE strip with planting alongside the edges of the film strip can save 7 percent of film material with slightly higher temperature and slightly lower soil moisture as compared to the prevailing common practice at the middle of the film strip. (2) Under certain condition, strengthened paper ma-terial properly treated with oil is a promising alternative to replace the polyethylene film.