Abstract
Abstract Soil samples with different ages collected from a buried volcanic ash proile were fractionated according to particle size and the characteristics of organic matter contained in these fractions were investigated. Humus composition differed largely between the top layer of soil and buried layers of soil. In buried humic volcanic ash soils, the humus composition varied with age according to the particle size. It was considered that the formation of highly humified humic substances occurred first on the surface of clay particles but that humic substances were stabilized further in larger aggregates in buried soils. Sand particle size fraction (> 0.02 mm), which was assumed to be composed of aggregates of finer organo mineral complexes and rotted scoria with minor contribution from free organic matter, was the most important fraction in holding and stabilizing the humus in buried volcanic ash soils.
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