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我国北亚热带的黄棕壤随着南北地理位置与土壤发育程度的改变,土壤中不同形态的铁铝锰氧化物的含量及指数呈现有规律的变化。由北而南土壤发育程度加强,土壤中游离铁、游离铝、铁游离度、铁化系数以及铝游离度增加;而铁活化度、铝活性比下降。土壤的游离铁含量虽可反映土壤的发育程度,但在一定程度上又受母质类型的影响,不宜用游离铁量作为黄棕壤的诊断指标;而铁游离度更能表征黄棕壤的发育特性,可作为黄棕壤的诊断指标之一。
Yellow brown earth in northern subtropics of China with the north-south geographical location and soil development changes, soil different forms of iron-aluminum-manganese oxide content and index showed a regular change. The extent of soil development from the north to the south enhanced the contents of free iron, free aluminum, iron freeness, iron reduction coefficient and aluminum freeness in the soil, while the iron activation and the aluminum activity decreased. Although the free iron content of soil can reflect the degree of soil development, it is not suitable to use the free iron content as the diagnostic index of yellow brown soil to a certain extent due to the influence of parent material type. Iron freeness can better characterize the development of yellow brown soil Characteristics, can be used as a diagnostic indicator of yellow brown soil.