Setting a topographical subdivision of lower category of the Agricultural Soil Classification : A case study in Katashina, Gunma

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  • 詳細土壌区分図による農耕地土壌分類下位カテゴリーの細分 : 群馬県利根郡片品村を事例として
  • ショウサイ ドジョウ クブンズ ニ ヨル ノウコウチ ドジョウ ブンルイ カイ カテゴリー ノ サイブン グンマケン トネグン カタシナムラ オ ジレイ ト シテ

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Abstract

Detailed soil survey in general has been explicitly expected to be applicable for precision soil and environmental management. However, identifying and interpreting soil in a certin farm parcel requires more clear concept of object boundary of gradual change of soil properties in reality. We examined the validity of present definition of soil classification units up to series level through conducting a detailed soil survey in the dilluvial fan, Katashina, Gunma. We set a benchmark soil with inductive inference of the past activity of Mt. Haruna, which supplied tephra as parent material in the study area, and determined topo-sequential change of both morphological and physico-chemical properties of pedons from benchmark soil. We overlaid predicted soil units obtained from filed survey to 10m mesh digital elevation model with GIS to prepare 1:5000 soil map in the study area (ca. 60ha). The results showed that Haplic Volcanogeneous Regosol developed on convex slope, Humic Volcanogeneous Regosol develop on concave slope, while the area affected by land readjustment was characterized by Haplic Andosol which suggested the presence of buried horizon with andic soil properties in the area.

Journal

  • Pedologist

    Pedologist 54 (2), 73-82, 2010-12-31

    Japanese Society of Pedology

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