Distribution of rare-earth (Y,La, Ce) and other heavy metals in the profiles of the podzolic soil group |
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Authors: | Yu N Vodyanitskii S V Goryachkin A T Savichev |
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Institution: | 1.Dokuchaev Soil Science Institute,Russian Academy of Agricultural Sciences,Moscow,Russia;2.Institute of Geography,Russian Academy of Sciences,Moscow,Russia;3.Geological Institute,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Along with Fe and Al, many heavy metals (Mn, Cr, Zn, Cu, and Ni) show a markedly pronounced eluvial-illuvial redistribution
in the profiles of soils of the podzolic group. The intensity of the redistribution of the bulk forms of these metals is comparable
with that of Fe and exceeds that of Al. Although the podzolic soils are depleted of rare-earth metals, the latter respond
readily to soil podzolization. The inactive participation of Al is explained by an insignificant portion of the active reaction-capable
fraction. Podzolization does not influence the profile distribution of Sr and Ba. The leaching degree of heavy metals such
as Mn, Cr, Zn, Ni, and Zr is noticeably higher in the sandy podzols than in the loamy podzolic soils. Leaching of heavy metals
from the podzolic horizons is of geochemical importance, whereas the depletion of metals participating in plant nutrition
and biota development is of ecological importance. The leaching of heavy metals is related to the destruction of clay particles
in the heavy-textured podzolic soils; the effect of the soil acidity on the leaching of heavy metals is less significant. |
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