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冻融作用是土地盐碱化的形成机制之一,对冻融区春季积盐有明显的控制作用.在冻融过程中,土壤剖面结构发生变异,形成冻结层、似冻结层和非冻结层.以祁连山黑河上游阿柔草场为例,研究了解冻期土壤水盐运移变化特征.阿柔草场隶属青海祁连山地区,地处西北高寒地区,为季节性冻土区,大面积土壤经历冬冻春融的冻融循环.这种循环引起了土壤中水分和盐分运移的特殊规律,即冻结时土壤中的水分和盐分向冻层迁移,使得冻层的土壤含盐量明显增加;而融化时,由于地表蒸发,土壤中的水分和盐分又向地表强烈迁移,从而造成盐分在地表积聚,诱发盐分两次抬升.
Freezing and thawing is one of the mechanisms of salinization of land, and it has a clear control over the salt accumulation in the spring and thaw area.In the process of freezing and thawing, the structure of the soil profile is changed to form a frozen layer, like a frozen layer and a non-frozen layer Taking Altyn Ranch in the upper reaches of the Heihe River in Qilian Mountains as an example, the characteristics of soil water and salt transport during the thawing period were studied.An soft grassland belongs to the Qilian Mountains in Qinghai Province and is located in the alpine region of northwestern China, which is a seasonal frozen soil region. Spring thawing freeze-thaw cycle.This cycle has caused the soil water and salt migration of the special law, that is frozen soil moisture and salt migration to the frozen layer, making the frozen soil salinity increased significantly; and melting When the surface evaporates, the soil water and salt migrate strongly to the surface, resulting in the accumulation of salt on the surface, causing salt to rise twice.