新疆膜下滴灌棉田盐分运移规律研究

以不同土壤质地、不同滴灌年限的滴灌棉田为研究对象,探明新疆膜下滴灌棉田盐分运移规律.研究结果表明:壤土中盐分随生育期的变化表现出 "盐随水动"的特点;盐分在不同广度与深度下被重新分配,在膜间地表和60cm土层以下积累强烈.而粘土中盐分的变化却较为缓慢,规律性较差.不同滴灌年限中滴灌年限越长,棉田中的盐分积累就越多.研究提出对于壤土地每3年进行一次秋冬灌溉或茬灌是一种经济有效地压盐措施.

Research of Salt Transfer for the Covered Cotton under Drip Irrigation with Plastic Film Mulch in Xinjiang

Salt Transfer laws for the covered cotton under drip irrigation with plastic film mulch were researched by choosing the land of different soil texture and different age limit of drip irrigation in Xinjiang.The results showed that salinity changed according to the characteristics of "salt moving with the water" with the retardation of growth period in the loam.Salinity was redistributed in different breadth and depth,and accumulated strongly at the center of open ground and the depth of 60 cm in the soil.Salinity changed slowly in the Clay and the regularity was poor.The longer the drip irrigation lasted,the more salt was accumulated in cotton field.It was believed that irrigation in the fall and winter every three years in the loam was a economical and effective measure for resistance to salinity.