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用化学选择溶提法，测定了幕阜山不同海拔高度土壤及剖面不同层次的粘粒中铁铝氧化物的含量。结果表明：①随着海拔升高，土壤粘粒中有机络合态及非晶形的铁、铝氧化物含量增高，与土壤中有机质的含量呈显著正相关。②同一剖面不同层次的土壤，随着有机质含量由上向下递减，粘粒中络合态铁铝氧化物的含量也逐渐降低。③随着海拔升高，铁铝氧化物除了非晶形的含量增高之外，晶态三水铝石含量也增高，表明粘粒中氧化铝有随海拔升高而富集的特点。根据以上结果，讨论了铁铝氧化物活化与成土条件的关系，提出了幕阜山土壤的富铝化特征，并建议将诊断层土壤粘粒的氧化铁活化度作为山地土壤系统分类的指标之一。
By chemical selective dissolution method, the content of iron and aluminum oxides in different levels of clay and clay at different elevation in Mufushan were measured. The results showed that: (1) With the elevation increasing, the contents of organic complex and amorphous iron and aluminum oxides in soil clay increased significantly, which were positively correlated with the content of organic matter in soil. ② With different soil layers in the same section, with the decreasing of organic matter content from top to bottom, the contents of the complexed Fe-Al oxides in the clay particles also decreased gradually. (3) As the altitude increases, the content of crystalline gibbsite increases with the increase of amorphous content of Fe-Al oxides, indicating that the alumina in the clay particles is enriched with elevation. Based on the above results, the relationship between Fe-Al oxide activation and soil-forming conditions was discussed, and the Al-rich characteristics of Mufu Mountain soil were proposed. It is suggested that the activity of iron oxide in the clay samples in the diagnostic layer should be used as an index for the systematic classification of mountain soil one.