Numerical landforms and soil physical properties in western Tokachi plateaus [Japan]
1994
Yazawa, M. (Hokkaido Univ., Sapporo (Japan). Faculty of Agriculture) | Kumahara, T. | Kyreme, G.K.
Numerical landforms of the five plateaus in western Tokachi district were calculated from the elevation file of the Digital National Land Information. The plateaus are different in formation period and average altitude. From the relief and slope, it was recognized that the dissection of plateaus usually become stronger with increasing altitude. Agricultural soils on each plateau are classified into the dry-type and wet-type based on drainability. In case of plateaus that have a neighboring upper plateau, the wet-type soils tend to be distributed along the boundary line with the upper plateau. The dry-type soils have convex slope and the wet-type soils have concave slope. Having compared physical properties of the dry- and wet-type soils, it is concluded that the poor drainage of wet-type soils is due to high dry density in deeper layers, poor permeability, and geomorphological factors, for example the concave slope
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