Abstract: 【Objective】In order to solve the increasingly serious problem of residual film pollution in maize field in the dry farming area of the southern foothills of Daxing′anling Mountains,the replacement and application prospect of degradable plastic film and thickened plastic film were explored.【Methods】In the experimental base of Hinggan League Institute of Agricultural and Animal Husbandry Sciences（Horqin Right Wing Front Banner）,three different types of film mulching experiments were set up,including national standard plastic film mulching,thickened plastic film mulching and degradable plastic film mulching. The difference of soil temperature,moisture and maize yield in different soil layers of maize fields under different types of film treatment were compared and analyzed.【Results】For soil temperature,the thermal insulation effect of degradable plastic film treatment from maize sowing to jointing stage was basically the same as that of national standard plastic film treatment,but the thermal insulation effect of degradable plastic film treatment after jointing stage was lower than that of national standard plastic film treatment;before the grouting stage,the thermal insulation effect of the thickened plastic film treatment was significantly lower than that of the national standard plastic film treatment（P<0.05）. After the grouting stage,the soil temperature of 0-5 cm soil layer of the thickened plastic film treatment was significantly higher than that of the national standard plastic film treatment（P<0.05）. For soil moisture,the change trend in different treatments from three leaf stage to jointing stage was basically the same,which showed thickened plastic film>national standard plastic film>degradable plastic film,and the difference was not significant（P>0.05）;from tasseling and silking stage to filling stage,the soil moisture content of 0-30 cm soil layer in the treatment of national standard plastic film and thickened plastic film was significantly higher than that in the treatment of degradable plastic film（P<0.05）. For maize yield,compared with the national standard plastic film treatment,the degradable plastic film treatment and thickened plastic film treatment could increase the maize yield. The maize yield of the degradable plastic film treatment increased by 12.37% compared with the national standard plastic film treatment,and the difference between the degradable plastic film treatment and the national standard plastic film treatment was significant（P<0.05）.【Conclusion】The thermal insulation effect of degradable plastic film treatment was basically the same as that of national standard plastic film treatment before maize jointing stage. With maize growing,the degradable plastic film gradually cracked and degraded,which reduced the residual pollution of soil plastic film and increased the soil permeability,which was conducive to the growth and development of maize in the later stage. Compared with the national standard plastic film treatment,the degradable plastic film treatment could significantly increase the maize yield,and degradable plastic film mulching had a good application effect on maize field in the dry farming area of the southern foothills of Daxing′anling Mountains.

Key words: Degradable plastic film, Soil temperature, Soil moisture, Maize, yield