【摘要】 为详细分析准葛尔盆地南缘不同土壤质地棉田膜下滴灌盐分的运移规律,主要从不同生育阶段、滴灌年限、水平方向、垂直方向不同土层、总盐含量与产量的线性关系等5个方面对膜下滴灌盐分的运移进行了分析比对,初步得出:随着生育期的推后,各土层含盐量都有不同程度的加大;垂直方向盐分的积累在0-60 cm土层逐渐增加,60-100 cm土层盐分积累受膜下滴灌影响较小;水平方向背行(露地部分)中央土层处盐分积累最多,滴头处盐分积累最少;不同滴灌年限中滴灌年限越长,棉田中的盐分积累就越多,壤土和砂土中的盐分分布较粘土中的呈更规律的变化;分析认为定期大水漫灌洗盐、做好春复水工作,以及恢复排碱渠功能是土壤脱盐的必要手段。该研究可以为准葛尔盆地南缘不同土壤质地棉田土壤次生盐渍化防治提供理论依据。更多还原

【Abstract】 Salt transfer law under the condition of drip irrigation were analysed in five aspects,i.e.different postemergences,drip period,linear relation of soil salinity and yield,vertical direction and horizontal direction.The results showed that with the retardation of postemergences,the salt content in different soil layers were increased in different extent;the accumulation of salt in vertical direction was increased at the depth of 0-60 cm,but the one at the depth of 60-100 cm was little;the accumulation of salt in horizontal direction at the center of open ground was the most than other position and the one under the drop point is least;the more the drip time,the more the accumulation of salt in cotton field.As for different soil texture,the variation of accumulation of salt in loam and sandy clay has more regularity than that in the clay;It was believed that there are three ways for desalination,viz.using flood irrigation to flush salt periodically,the irrigation in spring and resuming alkali-drainage-channel.更多还原