【摘要】 本文建立了用于数值解的不同覆盖条件下土壤二维水热运动数学模型。该模型中多孔材料覆盖层(砂砾、秸秆等)被当作传热多孔介质处理,对水分传输的影响被当乍具有一定阻力的阻挡层处理,且将油纸、塑膜及土面增温剂等均视为薄膜类材料。省略了许多假设条件,因而使覆盖效应的研究建立在更加科学的基础上,可以更为深入地了解覆盖层在不同气候条件下对土壤水分蒸发、入渗及地温影响机理和程度。为综合评价和选用农用覆盖材料及其参数提供了手段。更多还原

【Abstract】 A two-dimensional model was developed to analyze the seedbed soil moisture and temperature regimes affected by various kinds of mulch under different soil and climate conditions’. In this model, the porous mulch was treated as the porous materials samilar to the soil. Primary functional factors of a porous mulch to affect on soil moisture and temperature regimes are its heat and vapor transport abilities. For the film mulch, its optical properties are the major factors affacting soil water and heat. In part II, the finite element method was employed to solve the governing equations, and a simulation program for the influence of mulches on the seedbed moisture and heat behaviour was established and validated by the field experiment data.更多还原