Soil Genesis of the Bi-ei Hilly Lands Composed of Pyroclastic Flow Sediments from Mt. Tokachi-dake

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  • 十勝岳火砕流堆積物を母材とする美瑛丘陵地の土壌生成
  • トカチダケ カサイリュウ タイセキブツ オ ボザイ ト スル ビエイキュウリョウチ ノ ドジョウ セイセイ

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This paper reports the findings of an examination of the hilly land of Bi-ei, which is composed of pyroclastic flow sediments. The Soil genesis of the Bi-ei hilly lands were examined relative to its position in the hills, the form of the slopes, and the detail of the landform. A summary of the analysis and measurements follows: 1. The hilly land of Bi-ei is composed of pyroclastic flow sediments extruded from Mt. Tokachi-dake. The altitude of the hilly land of pyroclastic flow sediments decreases as the land gets farther from the center of extrusion. 2. The upper part of the hilly land is characterized by a narrow hilltop and a broadly sloping area. In the peripheral hilly land at lower altitudes, the hilltops are broader and narrower. Thus, the landform is comprised of undulate and flat surfaces. 3. The soil in the upper part of the hilly land is brown forest soil. Erosion was severe on the upper slopes, and the humic layer is thin. The texture is medium coarse to coarse, and the bedrock can be observed at shallow depth. On the lower slopes, the soil layer is thick and has a high humus content. The texture is fine to medium coarse due to the accumulation of eroded soil from the top and upper areas of the hill. The soil on the peripheral hilly land is finely textured brown forest soil on the undulate hilltop surfaces, while finely textured gray terrace soil is prevalent on the flat surfaces of the hill. 4. From the condition of the landform and the distribution of the soil surface, it was concluded that the landform condition greatly affected the formation of the hilly land of Bi-ei Soil erosion, secondary sedimentation, and sorting of grain-size due to lacustrine deposit formation also contributed to the formation of the landform.

Journal

  • Pedologist

    Pedologist 45 (2), 105-111, 2001-12-31

    Japanese Society of Pedology

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