AGROGENIC CHANGES IN DENSITY OF GRAY FOREST SOILS IN NORTHERN TRANS-URAL REGION
https://doi.org/10.26898/0370-8799-2017-5-2
Abstract
Results are given from long-term (1994–2016) studies on the effect of involving virgin soils in agricultural use on soil formation processes. The studies were carried out on three subtypes of gray forest soils (light-gray, gray and dark-gray) in the subtaiga zone of Tyumen Region. It is shown how physical parameters and chemical and water properties of arable lands change as influenced by annual tillage that consequently affect the nutrient status of cultivated plants and humification processes. The studies on changes in solid soil phase density, soil formation and aggregation of gray forest soils were carried out in comparison with virgin soil samples. It has been established that the soil bulk density of humus horizon of light-gray and gray forest soils is within the upper bounds of the optimums of 1.24 and 1.31 g/cm3; dark-gray forest soils are characterized by the optimum density of 1.10 g/cm3. The prolonged use of these soils in tillage resulted in increasing the solid soil phase density up to 2.62–2.80 g/cm3. The soil bulk density of arable horizon of gray forest soils has a wider range of variation during the growing season. Annual tillage keeps it within 1.14–1.20 g/cm3. A tendency towards gradual compaction of the arable layer has been identified. Anthropogenic changes in solid soil phase and soil bulk densities can be traced to 40 cm deep. Annual tillage and reduced plant residues have resulted in forming soil aggregates with density of 1.36–1.40 g/cm3, while on virgin soils this parameter is 1.19–1.28 g/cm3. It has been shown that anthropogenic over-compaction could negatively affect the water regime of arable gray forest soils and reduce their productivity.
About the Authors
D. I. EREMIN
Northern Trans-Ural State Agricultural University
Russian Federation
Russian Federation
Doctor of Science in Biology, Professor
7, Respubliki St, Tyumen, 625003, Russia
N. A. GRUZDEVA
Tyumen State Agrochemical Service Station
Russian Federation
Russian Federation
Lead Agrochemist
2, building 10, Roshchinskoye Shosse St, Tyumen, 625041, Russia
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Review
For citations:
EREMIN D.I., GRUZDEVA N.A. AGROGENIC CHANGES IN DENSITY OF GRAY FOREST SOILS IN NORTHERN TRANS-URAL REGION. Siberian Herald of Agricultural Science. 2017;47(5):13-22. (In Russ.) https://doi.org/10.26898/0370-8799-2017-5-2
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