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Agriculture 2016, 6(4), 63; doi:10.3390/agriculture6040063

The Effect of Tillage on Organic Carbon Stabilization in Microaggregates in Different Climatic Zones of European Russia

V.V. Dokuchaev Soil Science Institute, Pyzhevsky 7, Moscow 119017, Russia
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Academic Editor: Les Copeland
Received: 13 September 2016 / Revised: 11 November 2016 / Accepted: 23 November 2016 / Published: 2 December 2016
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Abstract

Tillage may affect the microstructural organization of soil, including the distribution of microaggregates with different mechanical strengths. We quantified the impact of tillage treatment on the amount and distribution of free organic matter, microaggregates (unstable and stable under low intensity sonification) and their components, in the upper horizons of zonal soils of the Center of the Russian Plain. Under plowing, the carbon content decreases, both in unstable and stable microaggregates. The loss of carbon in unstable microaggregates was ~24%, whereas in stable microaggregates, it was ~37%, relative to native soils. The carbon content of organic (LFoc) and organo-clay (Clayrd) fractions in unstable microaggregates (CLFoc/CClayrd) was almost identical in the upper horizons of native soils: the ratio of these components is for Albeluvisols (1.1), Phaeozem (0.8) and Chernozems (1.0). Under plowing, these decrease to: Albeluvisols and Chernozems (0.6) and Phaeozem (0.5). The shares of carbon accumulated within the unstable and stable microaggregates (Cunstable/Cstable) are constant under equilibrium conditions and show a tendency to decrease from north to south on the order of: Albeluvisols and Phaeozem (2.2) > Chernozems (1.0). Under plowing, they increase to: Albeluvisols (3.0) and Phaeozem (3.2) > Chernozems (1.5). View Full-Text
Keywords: tillage; organic matter stabilization; sonification; density fractionation; microaggregates; light fractions; readily-dispersible clay; hardly-dispersible clay tillage; organic matter stabilization; sonification; density fractionation; microaggregates; light fractions; readily-dispersible clay; hardly-dispersible clay
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Artemyeva, Z.S.; Kogut, B.M. The Effect of Tillage on Organic Carbon Stabilization in Microaggregates in Different Climatic Zones of European Russia. Agriculture 2016, 6, 63.

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