Distribution and Forms of Selenium in Paddy Soil

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Distribution and forms of selenium (Se) in paddy soil profiles were investigated. Data on the total Se content indicated that there was a distinct accumulation of Se in the B horizons, and that the content of Se was higher in the C horizons than in the A horizons. A significant difference in Se species between the upper and lower horizons was recognized. Since the amount of Se compounds with low molecular weight such as inorganic Se and Se bound with fulvic acids increased significantly in the lower horizons as compared to the upper horizons, it was assumed that Se was translocated in these soil profiles. Two mechanisms for the movement may be considered : (1) Inorganic Se released upon dissolution of iron oxides and iron hydroxides was translocated with percolating water. (2) Se compounds contained in fulvic acids were translocated with the movement of fulvic acids. In 6 out of 7 profiles, Se may have moved according to the first mechanism, whereas in the other one, both mechanisms may have been involved.
社団法人日本土壌肥料学会の論文