秸秆覆盖下的土壤水热运移

土壤水热耦合运移的数值模拟研究是在二十世纪五十年代在等温水分运动模型的基础上发展起来的，随着秸秆覆盖节水技术的发展，秸秆覆盖下水热耦合运移的数值模型得到不断研究和发展。秸秆覆盖下水热耦合数值模拟由于考虑了覆盖层对水热运移的影响变得复杂，文中综述了土壤水热运移模拟到秸秆覆盖下水热运移数值模拟的发展过程，常用的推求土壤参数的经验公式和秸秆覆盖下土壤水热耦合的上边界条件的确定方法。

Simulation on Coupled Movement of Soil Water and Heat with Straw Mulching

With the development of straw mulching, it became important water-saving measures in dryland agriculture. The study of soil water heat under the straw mulching could reflect the effects of dryland crops, fertilizer and growth conditions, provide theoretical support for dryland water-saving. As computer technology matures, using mathematical models become a simulation of soil water-heat transfer of an important way. Considering the effect of straw mulching layer, simulation on coupled movement of soil water and heat under straw mulching became complicated. This paper introduces the process of soil heat and water transport numerical simulation from bare soil to straw mulching, the empirical formula of the water movement parameters and the solution of boundary condition under straw mulching.