Trace elements in the arable soils of miyagi prefecture, Northeastern Japan

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  • 宮城県の農耕地土壌中の微量元素濃度
  • ミヤギケン ノ ノウコウチ ドジョウチュウ ノ ビリョウ ゲンソ ノウド

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Abstract

Eight hundreds and seventy-seven soil samples taken from arable lands in Miyagi Prefecture (7,300km^2, referred to as "Miyagi soils" henceforth), northeastern Japan have been analyzed for 42 trace elements. The results were compared with those of the previous national nationwide scale survey (380,000km2) obtained by analyzing 514 samples from 78 pedons (referred to as "national nationwide soils" henceforth) taken in such a way as to cover a wide range of soil types that are common to Japan. The frequency distributions of most of the elements were positively skewed and coincided well with those of log-normal distributions. The minimum values of all the elements in the national nationwide soils were one to two orders of magnitude lower than those in the Miyagi soils. On the contrary, the maximum values in the national nationwide soils were higher than those in the Miyagi soils with the exception of Cu, Zn, Mo, Sn, Sb, Tl and Pb, presumably due to anthropogenic pollution. Consequently, whereas the concentration ranges of the nationwide soils spanned two to four orders of magnitude, those of the Miyagi soils were narrowed to around one order of magnitude for most of the elements. In spite of these big differences in the concentration ranges between the national nationwide soils and the Miyagi soils, the pattern of changes in concentration of each element in soils with the increase of atomic number were quite similar. The concentrations of Cr, Cu, Zn, Cd, Sn, Pb, Bi and U were higher in surface soils than in sub-surface soils at 1% significance level. Whereas Cd was higher in paddy soils, other 7 elements were higher in orchard soils at 5% significance level. The dendrogram of the 41 elements showed that the occurrence and distribution of the elements in the national nationwide soils were basically controlled by the chemical properties of each element. In the Miyagi soils, however, the effects of anthropogenic activities were also evident.

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