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Group and fractional composition of humus in over moistened soils of the ob river russian sfsr ussr floodplain



Group and fractional composition of humus in over moistened soils of the ob river russian sfsr ussr floodplain



Vestnik Moskovskogo Universiteta Seriya 17 Pochvovedenie (1): 55-61



Organic matter composition was studied in various soils of the middle Ob plain [Western Russia, SFSR, USSR] for the purpose of soil diagnostics. In overmoistened soil humic acids predominate over fulvic acids. As the degree of hydromorphism in soils increases the ratio Cg:Cf in their organic matter increases. In meadow-sod, meadow gleyed and boggy silty-gleyed soils this ratio is < 1, < 1 and 2, respectively. The second fraction, which may be bound with Ca, predominates in both humic and fulvic acids. The organic matter composition in soils of the middle Ob plain is greatly affected by Ca-hydrocarbonate river waters and prolonged flooding.

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Accession: 005536659

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