Abstract
Carbon pools of different stabilities have been separated from the soil organic matter of agrochernozem and agrogray soil samples. The work has been based on the studies of the natural abundance of the carbon isotope composition by C3-C4 transition using the biokinetic, size-density, and chemical fractionation (6 M HCl hydrolysis) methods. The most stable pools with the minimum content of new carbon have been identified by particle-size and chemical fractionation. The content of carbon in the fine fractions has been found to be close to that in the nonhydrolyzable residue. This pool makes up 65 and 48% of Corg in the agrochernozems and agrogray soils, respectively. The combination of the biokinetic approach with particle-size fractionation or 6 M HCl hydrolysis has allowed assessing the size of the medium-stable organic carbon pool with a turnover time of several years to several decades. The organic matter pool with this turnover rate is usually identified from the variation in the 13C abundance by C3-C4 transition. In the agrochernozems and agrogray soils, the medium-stable carbon pool makes up 35 and 46% of Corg, respectively. The isotope indication may be replaced by a nonisotope method to significantly expand the study of the inert and mediumstable organic matter pools in the geographical aspect, but this requires a comparative analysis of particle-size and chemical fractionation data for all Russian soils.
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Original Russian Text © A.A. Larionova, B.N. Zolotareva, A.K. Kvitkina, I.V. Evdokimov, S.S. Bykhovets, A.F. Stulin, Ya.V. Kuzyakov, V.N. Kudeyarov, 2015, published in Pochvovedenie, 2015, No. 2, pp. 175–187.
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Larionova, A.A., Zolotareva, B.N., Kvitkina, A.K. et al. Assessing the stability of soil organic matter by fractionation and 13C isotope techniques. Eurasian Soil Sc. 48, 157–168 (2015). https://doi.org/10.1134/S1064229315020076
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DOI: https://doi.org/10.1134/S1064229315020076