北海道十勝管内の傾斜圃場における微地形と土壌分布から見た湿害発生のメカニズム

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In order to understand the mechanism of poor drainage caused by permeated water in a sloped upland field, it was investigated about micro-topography and soil distribution in two sloped upland fields (wheat field, potato field). The results are summarized as follows: 1) The slope in both research fields was, relatively gentle in higher parts, steep in middle parts and gentle in lower parts. 2) The yield of wheat was lowest in the area, where changed from a steep slope to a gentle slope rapidly in lower parts of slope. The depression was crossing in this area. 3) The yield of potato was lowest in the area, where was located in middle parts of slope and changes from a gentle slope to a steep slope rapidly. In the upper part of this area, comparatively big depression disappeared. 4) It was recognized the soil which had low permeability layer in wet injury parts and its boundary point at both fields. Moreover, the inclination of the upper surface of low permeability layer was looser than the terrestrial inclination at both fields. 5) Accordingly, at wheat field, it was considered that permeated water which flowed along depression was gushed in the parts, where changed to a gentle slope rapidly. At potato field, it was thought that permeated water which flowed along depression was gushed in the parts, where changed to a steep slope rapidly. As the inclination of the upper surface of low permeability layer was looser than the terrestrial inclination at both fields, it was considered that the gush was promoted with movement in down and the transverse direction of permeation water being restricted by low permeability layer.
日本ペドロジー学会の論文
2003-12-31

北海道十勝管内の傾斜圃場における微地形と土壌分布から見た湿害発生のメカニズム

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