Abstract: The experimental results of the straw mulching for summer maize showed that the soil evaporation in summer maize field significantly was decreased by the straw mulching.As the quantity of the mulched straw increased,the sensible heat flux increased,the latent heat flux decreased and the soil evaporation decreased gradually.The soil evaporation by the treatment of 5000kg/ha2 and 15000kg/ha2 straw mulching during the whole grow period decreased by 51.4mm and 75.4mm respectively,compared with the treatment of non-straw mulching.The straw mulching led to changes of meteorological elements close to the ground.The air temperature increased as the sensible heat flux increased,while the vapor pressure close to the ground decreased as the latent heat flux decreased.As the radiation to the ground was blocked by the straw mulching,the soil temperature decreased as the quantity of the mulched straw increased.

Key words: Soil evaporation, Soil evaporation, Heat flux, Meteorological element close to the ground, Straw mulching