第三系地域における緩斜地形と急斜地形との土壌の諸性質の比較 : 山形県真室川町で見られた例

概要

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In the Tertiary region in Mamurogawa Town, Yamagata Prefecture, striking differences in relief and soil distribution were found between volcanic and sedimentary rock mountains. Mountains composed of rhyolite, andesite, and so on, undulate strongly. The slopes on them are steep, and they are occupied widely by Lithosols, Regosols and Eroded Soils. On the contrary, mountains composed of mudstone, tuff, and so on, undulate gently. These slepes are gentle, and they are occupied widely by Brown Forest Soils and Black Soils. In short, soils are immature on volcanic mountains and mature on sedimentary mountains. Great differences in soil physical properties are found between the two type of mountains. Namely, soils are gravelly or sandy and packed loosely on volcanic mountains, however they are clayey and packed compactly on sedimentary mountains. Among the latter, soils are packed most compactly on mountains composed of Tozawa mudstone. This seems to be influenced by the differences in lithology and relief between the two types of mountains. On the contrary, no significant differences in chemical properties are found between the two mountains. It was considered that the expected differences were concealed due to aeolian deposits mixed into soil parent materials on both mountains.
日本ペドロジー学会の論文
1995-06-30