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- Title
Isotopic Composition of Carbon in Humus Acids of Albic Retisols and Luvic Chernozems.
- Authors
Makarov, M. I.; Malysheva, T. I.; Goncharov, A. A.; Tiunov, A. V.
- Abstract
Carbon isotope ratios in soil organic matter are often used in paleoecological research for reconstructing climate and plant communities (type of photosynthesis). The difficulties in interpreting isotopic data are related to the integral effect of several factors controlling the 13C/12C ratio in plants and soils, namely, the environmental conditions and the composition of soil organic matter. The study of Albic Retisols and Luvic Chernozems indicates that the extractable humus fractions are enriched in heavy isotope 13C relative to the total soil organic matter. In Retisols, the increased δ13С values are typical of humic acids below the humus horizon and for fulvic acids within the entire profile. In Luvic Chernozems, the 13C-enriched fraction is only fulvic acids. Thus, changes in the 13C/12C ratio in soils, in particular, its increase with depth, can be explained by migration of labile humus fractions in the profile and by their accumulation in deeper horizons.
- Subjects
HUMUS; CARBON isotopes; SOIL composition; FULVIC acids; HUMIC acid; PLANT communities
- Publication
Eurasian Soil Science, 2020, Vol 53, Issue 4, p430
- ISSN
1064-2293
- Publication type
Article
- DOI
10.1134/S1064229320040092