冻融期土壤水盐变化特征分析——以黑河上游祁连县阿柔草场为例

Analysis of the Variation Characteristics of Soil Moisture and Soil Salinity——Take Arou Pasture in the Upper Reaches of Heihe River for an Example

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 cycle of soil is a unique mechanism of soil salinization,which controls the soil salinity accumulation in spring.In the process of freezing-thawing,with the change of soil profile structure,three layers are formed.They are frozen layer,similar frozen layer and non-frozen layer.In this paper,the Arou pasture in the upper reaches of the Heihe River is taken for an example to study the variation characteristics of moisture and salt transportation.Arou pasture in the Qilian Mountains is a s...