Abstract
The effect of land use types and fertilizing systems on the structural and aggregate composition of loamy sandy soddy-podzolic soil and the quantitative parameters of soil organic matter has been studied. The contribution of soil aggregates 2–1 mm in size to the total Corg reserve in the humus horizon is higher than the contributions of other aggregates by 1.3–4.2 times. Reliable correlations have been revealed between the contents of total (Corg), labile (Clab), and active (C0) organic matter in the soil. The proportion of C0 is 44–70% of Clab extractable by neutral sodium pyrophosphate solution. The contributions of each of the 2–1, 0.5–0.25, and <0.25 mm fractions to the total C0 reserve are 14–21%; the contributions of each of the other fractions are 4–12%. The chemically labile and biologically active components of humic substances reflect the quality changes of soil organic matter under agrogenic impacts. A conceptual scheme has been proposed for the subdivision of soil organic matter into the active, slow (intermediate), and passive pools. In the humus horizon of loamy sandy soddy-podzolic soil, the active, slow, and passive pools contain 6–11, 34–65, and 26–94% of the total Corg, respectively.
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Original Russian Text © B.M. Kogut, M.A. Yashin, V.M. Semenov, T.N. Avdeeva, L.G. Markina, S.M. Lukin, S.I. Tarasov, 2016, published in Pochvovedenie, 2016, No. 1, pp. 52–64.
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Kogut, B.M., Yashin, M.A., Semenov, V.M. et al. Distribution of transformed organic matter in structural units of loamy sandy soddy-podzolic soil. Eurasian Soil Sc. 49, 45–55 (2016). https://doi.org/10.1134/S1064229316010075
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DOI: https://doi.org/10.1134/S1064229316010075