EFFECT OF SURFACE GLEYING ON IRON COMPOUNDS IN SOD-PODZOLIC SOILS ON PERMIAN DEPOSITS

Brinckman's ferrolysis theory (1970) is supplemented with the idea of autoretardation of iron oxide synthesis. This phenomenon results from changes in the pH and Eh during one of the stages of ferrolysis, which retard the synthesis of some iron oxides, especially lepidocrocite. A s a result, ferruginous concretions contain a smaller fraction of lepi docrocite than does the fine earth. In soils on Permian red deposits, the lepidocrocite crystals are smaller in size, especially in concreti ons. Indices such as the bogging index (Fe/Mn) and the Schwertmann cri terion Fe-o/d do not accurately indicate the degree of gleying in thes e soils.