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对地区水平地带５个有代表性的剖面进行研究。结果表明，发育在下蜀黄土母质上的土壤全铁丰富，游离铁和活性铁较低，络合铁极少，铁在Ｂ层和上体中的聚积明显，土壤形成处于富铁化阶段；基岩母质上土壤全铁极少，游离铁很高，活性铁极低，铁的聚积较弱，低于铝的富集，土壤形成处于富铝化阶段；中山区土壤全铁和游离铁很低，活性铁和络合铁极高，铁主要在Ａ层和ＡＢ层聚积，土壤形成处于硅铝化阶段。
Five representative sections of the regional level are studied. The results showed that the soils developed on the Xiashu loess parent material were rich in total iron, with lower contents of free iron and active iron, very few complex iron, abundant accumulation of iron in layer B and upper body, and soil formation in the iron-rich stage. There are very few total iron, high free iron, very low active iron, weak accumulation of iron in the parent material, lower than the enrichment of aluminum and the formation of the soil in the stage of aluminum enrichment. The soil total iron and free iron in Zhongshan are very low , Active iron and complex iron extremely high iron mainly in the A layer and AB accumulation, soil formation in the aluminosilicate stage.