土壤中氧化铁的活化过程的探讨

氧化铁在中性和酸性水稻土以及红壤的结构体的形成中,具有重要的作用.因为土壤中氧化铁不仅是土壤结构体的胶结物质之一,而更重要的是它具有较高的活性,易随环境条件的变化而转变.这一转变可以概而言之为活化和老化两种过程.氧化铁的老化是重要的.因长期渍水而分散、又重新排列的土壤颗粒,只有在氧化铁老化后才能形成较为稳定的结构体.

STUDY ON THE ACTIVATION PROCESS OF IRON OXIDES IN SOIL

The present paper deals firstly with the indexes of activation of iron oxides in soil on the basis of the data from previous paper and reference literatures.It is considered that the change of activity of iron oxides in soil.may be summarized as activation and aging.Though the change is not a reversible reaction,the aged iron oxides can be activated by the ac lion of organic matter and atmospheric factor.It is also o}nsidered that mineralogical patterns can not reflect quantitatively the change of activity of iron oxides;however,it can be estimated quantitatively to a certain degree by the content of amorphous iron oxides.