中文摘要：

为了研究不同膜下滴灌年限条件下土壤盐分的分布，连续监测了121团荒地种植棉花改良期间的土壤盐分。结果表明，滴灌4a，苗期2膜间裸地、棉花窄行间、膜内毛管下20～80cm土层土壤含盐量均较低，i00cm土层土壤含盐量较大，且膜内毛管下各土层土壤含盐量最大，膜内毛管下最小，浅层土壤含盐量的降低更有利于种子的出苗；生育初、末期表层土壤含盐量在1％之内，O～40cm土层形成脱盐区，60～80cm土层形成积盐区，脱盐效果十分明显，有利于棉花的生长。

英文摘要：

The soil salt contents of uncultivated land in 121 group, which was improved by cultivating cot- ton, were monitored to study the effects of the time of drip irrigation under film on soil salt distribution. The results showed that：under drip irrigation for 4 years, in the seeding period soil salt contents in depth of 20-80 cm were lower in bare land between mulches,, land between narrow rows of cotton and inner mulch land, but soil salt contents of 100 cm in depth were higher Soil salt content in inner mulch land was low and was beneficial to crop growth in seeding stage. Soil salt contents in different profiles were lower than 1%, desalination appeared in 0-40 cm and accumulation of salt existed in 60~80 cm in early and lat- er stage of growth under drip irrigation for 4 years, which was beneficial to the growth of cotton.