表層グライ系赤・黄色土の成因について(2) : 遊離酸化物の断面分布および酸化還元電位の季節変動

概要

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Seasonal changes of reduction-oxidation potential (redox-potential) in the surface horizon of Surface gleyed red-yellow soils (Stagnic Acrisols, Epiaquic Paleudults) in Okinawa Island were measured and its effect on the profile distiribution of free iron and aluminum oxides as well as exchangeable and easily reduciable manganese were analysed. The relations between the seazonal changes of redox-potential and the profile distribution pattern of the free iron, aluminum and manganese were different among the types of Suface gleyed red-yellow soils. From these facts the soil forming process of each types was deduced as follows: Surface gleyed red-yellow soil (gRY_I) distributed on the relatively wide crest flat has developed mainly by stagnogleization, whereas Surface gleyed and bleached red-yellow soil (gRY_<bI>) on the slopes between crest flat and upper sideslope has developed by the alternation of oxidative and reductive conditions (pseudogleization). On the other hand, Podozol like red-yellow soil (P_D like) on the narrow crest flat and it's shoulder is considered to thve developed by the combined soil forming process of reductive leaching and weak podzolization.
1998-06-30