我国酸性硫酸盐土壤中铁锰形态转化及迁移

酸性硫酸盐土壤酸性很强，有机质含量高，造成了这种土壤所特有的铁锰淋洗、转化和迁移规律。研究结果表明：在酸性硫酸盐土壤中全铁含量较低，一般在３５－５０ｇ／ｋｇ（以Ｆｅ２Ｏ３计），全锰含量也低，一般在０．２５－０．５５ｇ／ｋｇ（以ＭｎＯ计），一般滩涂中全铁大于６０ｇ／ｋｇ，全锰大于１ｇ／ｋｇ。酸性硫酸盐土壤中，铁的游离度较小，一般在３７－７０％，铁的活化度较大，一般在８－２０％，而滩涂中铁的游离度一般

TRANSFORMATION AND MOVEMENT OF IRON AND MANGANESE IN ACID SULF ATE SOILS OF CHINA

The eluviation-illuviation and movement regular patterns of different forms of iron and manganese in the acid sulfate soils were studied. The various iron and manganese oxides in the soils were in an inter connected and interactive eqlibrium systrm and an aging and activating contradictory entity. The soil acidity controlled the transformation of different forms of iron and mandanese. The acid sulfate soils had a special regular pattern of iron and manganese transformation, since they are very acid and contain a more O.M. Form the surface layer to the ground layer of the soil profiles, the pH value became lower, the ratio of amorphous iron/free iron became bigger and the ratio of crystalline iron/amorphous iron becamr smaller, along with the development of the soil profiles. As compared with iron, manganese was more sensitive to the change of redoxing condition, and the contents of total and easily reducible manganese were rather low in the acid sulfate soils.