土壤中氧化铁的转化及其对土壤结构的影响

氧化铁虽是土壤粘粒中的次要矿质成分,但它具有较高的活性,对土壤性质有重要的影响。作为胶结物质之一,氧化铁的形态及其含量,对土壤团聚体的形成,亦起重要作用^4,8]。某些水稻土中细孔隙增多,土块趋向紧实等问题^1,2],似乎与土壤中氧化铁存在形态有关。

INFLUENCE OF TRANSFORMATION OF IRON OXIDES ON SOIL STRUCTURE

The transformation of iron oxides in soil in the course of submergence and drainage, and its influence on the soil structure is discussed on the basis of incubation experiment. The yellow brown earth, the red earth and the laterite were added with various amounts of dried milk vetch powder, and incubated under the submerged condition with and without percolation. After 8 months, the incubated samples were dehydrated at various intensity and samples without dehydration were used for check (Table 2). The compleaed iron and amorphous iron oxides contents of incubated samples were influenced obviously by the addition of organic matter, submergence and dehydration, but the influence of dehydrated intensity on the compleaed iron content was insignificant (Table 3, 4&5).