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硅铝风化壳一般呈中性到微酸性反应，土壤无石灰反应，但在不同的地形部位，土壤中可溶盐的离子组成差异较大，地下水中盐分的化学组成及矿化度也明显不同，二者有相似的盐分移动规律。洪积扇中上部土壤与湖积洼地土壤中盐分分异明显，形成两种截然不同的土壤类型，显示出地形作为五大成土因素之一的重要作用。
Silical weathering crust generally shows neutral to slightly acidic reaction, and the soil has no lime reaction. However, the ion composition of soluble salts in soil is quite different in different topographical sites. The chemical composition and salinity of salinity in groundwater are also significantly different , Both have similar salt movement patterns. The alluvial fan in the upper soil and lake depression depression in the soil salinity significantly, the formation of two distinct soil types, showing the topography as one of the five major factors of soil forming an important role.