| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Research Abstract |
Gleyic horizon which characterized Japanese paddy soil is lowering by the influence of drainage improvement. In this study, the simulation model which can predict the vertical position of Gleyic horizon in the paddy soil was developed, and new paddy soil map (Fukui Prefecture) was delineated using the developed model. The rate of Gleyic horizon lowering was 0.28 cm year-1 and 1.31 cm year-1 at paddy field in ravine and other lowland in Fukui prefecture, respectively. The predicted depth of Gleyic horizons using the rate of gleyic horizon lowering had been overestimated in the paddy field of Fukui prefecture. The hybrid-kriging method was developed to take into consideration of the spatial dependency of the residues for prediction of the vertical position of Gleyic horizon. The hybrid-kriging method showed high prediction accuracy. The new paddy soil map which delineated using the hybrid-kriging method showed that 30% of the “Strong-gley soils” changed to “Gley soils” in Fukui prefecture.
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