黄土是在相对冷干气候条件下发育的成熟的灰黄色古土壤，不同地区黄土所属土壤类型主要为灰钙土、栗钙土、棕钙土、棕漠土和黑垆土。
But compared with reddish paleosols, it was formed in dry and cold conditions, so, loess even could serve as an indicator of dry and cold climate.
在降温过程中，盐渍土中水分向冷端迁移，易溶盐亦随之向土体冷端迁移；土壤溶液中的硫酸钠呈水合芒硝析出，因而使土体盐胀。
In the process of lowing the temperature, both the water and the easy soluble salt move to the cold end in the soil body.
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