INFLUENCE OF ANTHROPOGENIC FACTOR ON MICROAGGREGATE COMPOSITION OF GRAY FOREST SOILS
https://doi.org/10.26898/0370-8799-2018-1-4
Abstract
Results are given from analysis of microaggregate composition of virgin and arable gray forest soils and the reasons for its change due to long-term plucking are reported. The researches were conducted on different subtypes of gray forest soil (light gray, gray and dark grey ones) in the subtaiga zone of Nizhnetavdinskyi and Yarkovskyi districts, Tyumen Region. To identify the genetic features of microaggregate composition of gray forest soils, comparative analyses from virgin lands were carried out. It was found that light gray and gray forest soils initially had a favorable microaggregate composition, despite the humus substances deficiency and illuviation process. Virgin dark gray forest soils on the primary structure are similar to chernozem of the Urals forest-steppe zone, though they differ with low aggregate resistance. Dispersion coefficient of humus-eluvial horizon of gray forest soils varies from 4.6–5.0 % in dark gray soils to 15.5–16.4 % in light gray forest ones. Arable analogues of grey forest soils are characterized with the following values of dispersion coefficient: light gray forest – 34.5–40.1 %; gray forest – 19.8–24.3 % and dark gray forest – 15.9–16.6 %. The aggregation degree by Beaver in arable gray forest soils is 2 and more times less than that of virgin lands, which indicates a sharp decrease in microaggregate stability and deterioration of primary structure formation. Dramatic negative changes are observed not only in light gray and gray soil, but also in dark gray one with higher content of humus substances. It has been established that anthropogenic change of microaggregate composition of gray forest soils up to 1 meter depth was caused by moving elementary soil silty particles from the upper layers into the profile.
About the Authors
D. I. Eremin
Northern Trans-Ural State Agricultural University
Russian Federation
Russian Federation
Doctor in Biology, Professor
7 Respubliki St, Tyumen, 625003, Russia
N. A. Gruzdeva
Tyumen State Agrochemical Service Station
Russian Federation
Russian Federation
Leading Agrochemist
2 Roshchinskoye Shosse St, Building 10, Tyumen, 625041, Russia
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Review
For citations:
Eremin D.I., Gruzdeva N.A. INFLUENCE OF ANTHROPOGENIC FACTOR ON MICROAGGREGATE COMPOSITION OF GRAY FOREST SOILS. Siberian Herald of Agricultural Science. 2018;48(1):28-37. (In Russ.) https://doi.org/10.26898/0370-8799-2018-1-4
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