Oxalate-soluble compounds of Al, Fe, and Si in soils of cold humid regions as a function of weathering |
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Authors: | N I Belousova |
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Institution: | (1) Dokuchaev Soil Science Institute, Pyzhevskii per. 7, Moscow, 109017, Russia |
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Abstract: | Original and published data on the contents of X-ray amorphous oxalate-soluble compounds of Al, Fe, and Si in mesomorphic
eluvial soils of cold, moderately cold, and moderately warm continental humid and semihumid regions are generalized. The groups
of soils developed from mafic igneous, metamorphic, and pyroclastic rocks are considered. It is shown that the content of
oxalate-soluble oxides (OSOx) in the horizons of their maximal accumulation varies from less than 1% to 20–30%; the Alox/Feox ratio varies from 1 to 6.5. The leading factor dictating the amount and quality of the OSOx in the soils is the presence
or absence of volcanic glass in the parent materials. The boundary between the soils with and without volcanic glass corresponds
to the OSOx content of 5% and the Al2O3ox/Fe2O3ox ratio equal to 2. These criteria are more reliable than the Alox/Feox ratio used by foreign soil scientists to specify Andosols (Alox/Feox > 2). The contents of oxalate-soluble oxides of Al and Fe do not depend on the total contents of these oxides in the parent
material and seem to be related to the presence of these elements in minerals with different resistance to weathering. Under
the natural conditions described in this paper, the content of OSOx shows a very weak response to zonal (temperature-controlled)
climatic changes and/or to changes in the degree of humidity and the continentality of the climate. |
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