Effects of Different Film Mulching on Variation Characteristics of Loess Surface Density During Maize Growth Period

CHENG Shi-nian;FAN Gui-sheng;College of Hydroscience and Engineering ,Taiyuan University of Technology;

surface density;;permeable membrane;;ordinary film;;maize growth period;;loess

With the loess plateau soil as the research object,the 0 ~ 20 cm soil bulk density under the permeable plastic film mulching,ordinary plastic mulching and bare land are measured. The change characteristics of surface density of bare land and different laminating loess during maize growth period are analyzed. The results show that: during the maize growth period,different mulching soil on the surface presents a trend of gradual increase in bulk by 12.39% ~ 18.58%; the order of bulk density of surface soil from large to small is bare land,ordinary plastic mulching,permeable plastic film mulching. Compared with the planting time,the variation of the surface soil bulk density under three kinds of treatment at harvest time from large to small is bare land,ordinary plastic mulching,permeable plastic film mulching. This indicates that plastic mulching can reduce soil bulk density,the reduce effect of the permeable plastic film mulching is more obvious than that of the ordinary plastic mulching. The results better reveal the change characteristic of the surface soil bulk density under different mulch during the maize growth period and can provide theoretical basis for predicting hydraulics parameters and the management system of the farmland.