The aims of the work were the investigations of humus group composition from a neighborhood of the Biological Station of the Ural Federal University and any possible factors influencing humus. At the district of Biological station in August 2013 at three sites two soil profiles were excavated and samples from genetic horizons were collected. In two areas the soil is brown; in the third area the soil is sod-podzolic. Concentrations of total soil carbon, the composition of humus according to Kononova and Belchikova extraction method and physic-chemical parameters (pH ofwater, the contents of physical clay, the concentrationsof calcium and magnesium, exchangesilicon, andorganiciron) were measured in samples. Distributions of total carbon and carbon humus and organic iron in all profiles on all areas were regressive-accumulative. The maximum ratio CHA/CFA in the brown soil profile was found in the humus horizon and in the sod-podzolic soil in litter. Regression equation relating the inside profile distribution CHA/CFA ratio with physic-chemical parameters (possible predictors composition of humus) was calculated. The results ofregression revealed thatthe CHA/CFAratio in the brown soil profile dependedmainlyon the content ofthe exchangesilicon.
brown soils, sod-podzolic soils, humus, group composition of humus, regression analysis
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