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1、增沮保温:由于地膜极薄而透明,覆盖地面透光性好,能充分有效地利用太阳光能,贮存光热于土壤中。透过的光能,遇泥面转变为热能,而地膜的导热性差,热能散发较慢,在地膜密封期间,膜内水分蒸发极少,热能被水分蒸发时吸收和带走也较少,因而热能在较长时间保存于膜内,使膜内温度显著增加,提前满足作物种子萌发和根系生长对温度的要求。据测定,玉米盖膜后,膜内温
1, by increasing thermal insulation: thin and transparent because of the film, covering the ground light is good, can fully utilize the solar energy, storage of light and heat in the soil. Through the light energy, the case of mud surface into heat energy, while the thermal conductivity of the film is poor, the heat dissipation is slow, during the film seal, membrane evaporation is minimal, the heat is absorbed and taken away by the water evaporation is less, and therefore Thermal energy stored in the membrane for a long time, so that the membrane temperature increased significantly, in advance to meet the crop seed germination and root growth temperature requirements. According to the determination, corn cover film, membrane temperature