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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。
By analyzing the changes of soil salinity, moisture and temperature during the freeze-thaw period in drip irrigation in northern Xinjiang from November 2014 to March 2015, the changes and coupling relationships of hydrothermal salts in different soil layers during freezing and thawing periods were discussed. The results showed that soil moisture and moisture in the middle and lower layers were higher during the freezing and thawing periods. The salinity ranged from 0 to 80 cm in the soil profiles. The salt content in the shallow soil was significantly increased. The soil salinity variation coefficient was 20 cm The layer of 0.525,40 cm soil layer is 0.257, the soil layer of 80 cm is 1.041. During the freeze-thaw period, the salinity of soil water changed significantly along the profile distribution. The soil water potential gradient and soil temperature gradient were the main factors of salt water migration during the freeze-thaw period, and the soil water salinity was highly coupled.