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土壤中不属于层状硅酸盐组成部分的其它形态的铁,统称为游离铁(Fe_d),主要是氧化铁及其水合物。土壤(或粘粒)中游离铁占全铁的(Fe_T)的百分比称为铁的游离度(Fe_d×100/Fe_T),它反映成土过程的特点,常用作为风化度的指标之一。例如,云南亚热带地
Other forms of iron in the soil that are not part of the phyllosilicate are collectively known as free iron (Fe_d), mainly iron oxide and its hydrates. The percentage of free iron to total iron (Fe_T) in soil (or clay) is called iron freeness (Fe_d × 100 / Fe_T), which reflects the characteristics of soil forming process and is often used as an indicator of weathering degree. For example, Yunnan subtropical land