宁夏中部干旱带旱地玉米覆膜免耕对土壤典型理化性状影响研究

摘要

Study on the Influence of dryland maize mulching and tillage free on soil physical and chemical properties in arid zone in central Ningxia was carried out in this paper. Results showed that mulching and tillage free can result to tempera-ture rising and raise soil bulk density at 0~10 cm of the earth's surface. Soil bulk density at 10~40 cm was lower than that in sowing time. Mulching and tillage free accelerated soil rapidly available P, increased soil organic matter content. Top layer of soil water content in each growth stage was higher than that planted in open land. Soil water content rose along with extension of mulching and tillage free time.%对宁夏中部干旱带旱地覆膜免耕农田土壤理化性状变化进行了研究，结果表明：覆膜免耕具有一定的增温效应，可显著增加地表0～10 cm 土壤容重，覆膜免耕10～40 cm 土壤容重低于播种期覆膜和露地种植，加速土壤速效 P 消耗，有效增加土壤有机质含量，对土壤水分具有表聚效应，使玉米各生育时期耕层土壤含水量均高于露地种植，且随覆膜免耕时间的延长，0～100 cm 土壤含水量逐步增加。