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对10个土壤剖面进行研究结果表明:我国北亚热带酸性母岩发育的土壤中,铁、锰、铝、硅4种水合氧化物都随粘粒在剖面中积累,但铁、锰的迁移速度较粘粒快.元素游离度大小顺序是锰>铁>铝,以锰的活性最高,铁次之.B层铁的游离度反映了土壤的发育程度,初步认为可以把铁游离度40%做为区分硅铝层和铁硅铝层的指标之一.此类土壤中发育程度较高者,(AlNa/Alt)×100、(SiNa/Sit)×100比较一致.
The results of 10 soil profiles show that the four hydrate oxides of iron, manganese, aluminum and silicon accumulate in the profile in the soil developed in the northern subtropical acidic parent rock, but the migration speed of iron and manganese is Clay particle size is higher than that of the clay particle.The degree of elemental freeness is in the order of manganese> iron> aluminum, with the highest activity of manganese, followed by iron.The freeness of iron in layer B reflects the degree of soil development, and initially thought that iron freeness of 40% One of the indicators that differentiates between Si-Al layers and Fe-Si-Al layers is that AlNa / Alt × 100 and SiNa / Sit × 100 are more consistent in these soils.