摘要： 通过分析地膜覆盖后土壤水分平衡的变化特点,建立了地膜覆盖前后农田土壤湿度变化的模拟方程.系统阐述了地膜覆盖土壤水分效应的形成机制及其变化规律.指出了地膜因子、气象因子及植物因子等在土壤水分效应形成中的作用,为地膜覆盖在农业生产中的优化利用提供了理论依据.

关键词: 地膜覆盖, 土壤水分

Abstract: The simulating models about the change of soil water content under plastic mulch were established by analysing the changes of soil water balance after mulching, The forming mechanism and the changing regular of soil water content under plastic mulch were systematically expounded."Che func-tions of plastic mulch, meteorology factors and so on in soil jvatcr effect were discussed in this paper.This supplies theoretical basis for the optimum application of plastic mulch in agriculture.

Key words: Plastic mulch, Soil water content