膜下滴灌棉田冻融期土壤水分盐分变化特征  

Soil moisture and salinity changes in cotton field of drip irrigation during freeze-thaw period

作　　者：由国栋[1,2] 虎胆.吐马尔白 邵丽盼.卡尔江 吴永涛 李卓然[1] 

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]山东省滨州市小开河引黄灌溉管理局,山东滨州256600 [3]新疆水利厅农牧区水利规划总站,新疆乌鲁木齐830000

出　　处：《干旱地区农业研究》2017年第4期124-128,共5页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(51469033)

摘　　要：通过分析2014年11月—2015年3月北疆地区膜下滴灌棉田冻融期土壤盐分、水分与温度变化,探讨了不同土层水热盐在冻融期的变化和耦合关系。结果表明:冻融期土壤表层和深层含水量较高,中间层含水量较低;土壤剖面盐分在0~80 cm呈现层状分布,浅层土壤发生盐分明显累积,土壤盐分变异系数20 cm土层为0.525、40 cm土层为0.257、80 cm土层为1.041。在冻融期,土壤水分盐分沿剖面分布发生明显变化;土水势梯度、土壤温度梯度是冻融期土壤水分盐分迁移的主要因素,土壤水热盐之间变化具有高度的耦合性。The changes of soil salinity, moisture and temperature of film drip irrigation cotton field in north areaom November 2014 to March 2015 were analyzed. Changes of soil water, heat and salt and their coupling relationship uring freezing and thawing period were measured. The results revealed that during freezing and thawing period, the wa-r content in the surface and deep soil was higher while middle layer had low water content. Degree of salinity increased ith the soil depth, and was significantly enriched in surface soil. During freezing and thawing period, the distribution ofater and salinity of soil profile was significantly changed. Soil water potential gradient and soil temperature gradient were he principal factors influencing soil water and salt migration, and soil water, heat and salt changed coordinately.

关 键 词：滴灌棉田 冻融期 水分 盐分 变化特征 

分 类 号：S152.7[农业科学—土壤学] S562.07[农业科学—农业基础科学]