A Toposequence of Fine-Textured Soils in the Hilly Area of the Northernmost Part of Hokkaido : II. Mineralogical and Micro-Analytical Studies

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The form of aluminum and iron occurring in the illuvial horizons of the fine-textured soils of the northernmost part of Hokkaido was investigated by use of mineralogical and microanalytical techniques. Not only humo-aluminum complexes but also interlayered aluminum were significant as the form of aluminum which migrated. On the other hand , most of the accumulated iron was present in the form of an amorphous gel not associated with humus. Regarding the transport mechanism of aluminum and iron in the soils investigated, simultaneous or successive occurrence of the following processes was deemed important: 1) the transformation of mica and vermiculite to soil beidellites in the eluvial horizon; 2) the formation of interlayered aluminum and amorphous inorganic iron segregations in the illuvial horizon. The migration of aluminum and iron in Spodosols associated with the formation of macro-molecular organo-metallic compounds or proto-imogolite sols was not sufficient to explain the transport mechanism observed in the fine textured soils.
社団法人日本土壌肥料学会の論文