Abstract
Morphological and physicochemical properties of the five pedons (M11～M15)of paddy soils located in Ueno Basin, western Mie prefecture, Japan, were investigated, and the soil classification of them was examined. The five pedons were affected by stagnant water and groundwater, and the given soil names reflected the differences in the effects of the water. In the Soil Classification System of Japan (2017), M11 was classified as an Epi-gray Gley Fluvic soil, M12 and M13 were Haplic Gray Fluvic soils, and M14 and M15 were Mottled Gley Fluvic soils. In the Comprehensive Soil Classification System of Japan (2011), M11 was classified as a Fine-textured Mottled Gley Lowland soil, M12 and M13 were Fine-textured Haplic Gray Lowland soils, and M14 and M15 were Fine-textured Mottled Gley Lowland soils. In the World Reference Base for Soil Resources (2022), M11 was classified as an Eutric Orthofluvic Gleysol (Pantoclayic), M12 was an Eutric Pantofluvic Fluvisol (Pantoclayic), M13 was an Eutric Gleyic Pantofluvic Fluvisol (Pantoloamic), M14 and M15 were Eutric Orthofluvic Gleysols (Pantoloamic). The parent materials of the five pedons would be deeply affected by Kobiwako Group in the Ueno Basin, and the clay contents of the five pedons were higher than those of paddy soils from Ise Plain in northern and central Mie prefecture, Japan. However, a significant correlation was found between clay contents and cation exchange capacities (r = 0.88, p < 0.01, n = 36)for the paddy soils from both areas, suggesting that the amounts of negative charge developed per a unit weight of clay were similar among them. The five pedons investigated were deeply affected by reducing condition, and some of them showed a tendency of Fe dissolution and accumulation. For further utilization as paddy fields, it would be important to monitor the Fe contents of the surface layer of these soils.
