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Changes in the content and quality of humus in leached chernozems of the Trans-Ural forest-steppe zone under the impact of their agricultural use

  • Soil Chemistry
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Abstract

The results of long-term studies of changes in the content and fractional-group composition of humus in leached chernozems (Luvic Voronic Chernozems, WRB 2006) of the Trans-Ural forest-steppe since the beginning of their plowing are considered. These soils are characterized by the high humus pool (up to 500 t/ha in the virgin state and up to 430 t/ha in the plowed state) and the high degree of the organic matter humification. Humus is of the fulvate–humate type in the upper 30 cm and of the humate–fulvate type in the deeper layers. From 1968 to 2006, the total pool of humus in the 1-m-deep soil layer of the plowed chernozems decreased by 8.5% in comparison with the initial virgin soils. The rate of dehumification reached 1.0–1.4 t/ha per year. The long-term plowing of leached chernozems also led to a smaller content of nitrogen in the organic matter (the C/N ratio increased from 11.5 to 13.6). The relative content of free humic acids (HA-1) and humic acids bound to clay minerals (HA-3) increased, whereas the content of calcium humates (HA-2) decreased. The composition of fulvic acids in the plow horizon was characterized by the rise in the content of aggressive (FA-1a) and mobile (FA-1) fractions, while the amount of fulvates bound to calcium (FA-2) decreased.

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  1. State Agrarian University of the Northern Trans-Ural Region, ul. Respubliki 7, Tyumen, 625002, Russia

    D. I. Eremin

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  1. D. I. Eremin
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Correspondence to D. I. Eremin.

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Original Russian Text © D.I. Eremin, 2016, published in Pochvovedenie, 2016, No. 5, pp. 584–592.

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Eremin, D.I. Changes in the content and quality of humus in leached chernozems of the Trans-Ural forest-steppe zone under the impact of their agricultural use. Eurasian Soil Sc. 49, 538–545 (2016). https://doi.org/10.1134/S1064229316050033

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  • DOI: https://doi.org/10.1134/S1064229316050033

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