Abstract
Data on radiocarbon ages of different fractions of humus (humic acids, fulvic acids, and humin) in the profiles of chernozems are analyzed. A chronoecological grouping of humus in modern and buried (fossil) soils is suggested. An increase in the radiocarbon age of humic substances down the soil profile has a stepwise character. It is shown that the 14C content in chernozems decreases down the soil profile more somewhat slower than the 12C content. The dependence of a decrease in the humus content of buried soils on the age of burying is traced for a time span of 800 ka.
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Ivanov, I.V., Khokhlova, O.S. Radiocarbon ages of humic substances in chernozems. Eurasian Soil Sc. 41, 1412–1416 (2008). https://doi.org/10.1134/S1064229308130097
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DOI: https://doi.org/10.1134/S1064229308130097