Drawing of Large-Scaled Soil Map on Volcanic Acid Soil Area in Tokachi District of Hokkaido

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  • 北海道十勝管内の火山性土地帯における大縮尺土壌図の作成
  • ホッカイドウ トカチカン ナイ ノ カザンセイド チタイ ニ オケル ダイ シュクシャク ドジョウズ ノ サクセイ

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Abstract

In order to understand the detailed distribution of Volcanic Acid Soil, a large-scaled soil map on the middle and high terraces in Memuro Town of Hokkaido was drawn by combining soil survey data and satellite image data (resolution: 20 m). The results are summarized as follows: 1) From a soil survey, soils in the research area were classified into 4 types according to "Classification of Cultivated Soils in Japan, Third Approximation," which were "Humic Haplic Andosols," "High-humic Haplic Andosols," "High-humic Cumulic Andosols" and "High-humic Cumulic Wet Andosols." Besides, High-humic Cumulic Wet Andosols were classified into 2 categories based on the physical condition in the subsoil, which were "Wet Andosols" with volcanic ash subsoil and "Wet Andosols" with a diluvial deposit subsoil. 2) "Wet Andosols" were characterized by low pore space filled with gravitational water and high remaining nitrate after crop harvest. This trend was remarkable in the "Wet Andosols" with diluvial deposit subsoil. 3) "High-humic Haplic Andosols" and "Wet Andosols" with diluvial deposit subsoil showed different distributions. "High-humic Haplic Andosols" were distributed in the area higher than 200 m elevation. On the other hand, "Wet Andosol" with diluvial deposit subsoil was distributed in the area with varying elevation. 4) By using satellite data obtained during the dry period, surface humus contents could be predicted. Accordingly, a large-scaled soil map was drawn based on humus contents map, as well as on the characteristics of humus contents and distribution of each soil type. The obtained map corresponded well to the already existing soil map and also reflected exactly the precise soil distribution in each field .where there is a reflection of micro-topography.

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