Some aspects of soil development in small sandy catchments of ancient river valleys (a case study of Ob-Tom interfluve)

6th Scientific Conference with international participation "Reflection of Bio-, Geo-, Anthropospheric Interactions in Soils and Soil Cover" in memory of RS Ilyin

地球科学;生物科学

Konstantinov, A.O.^1 ; Yu Konstantinova, E.^2 ; Loiko, S.V.^3 ; Kulizhskiy, S.P.^4

Geology of Oil and Gas Research Education Center, Tyumen Industrial University, Volodarskogo Street 56, Tyumen

625000, Russia^1

Institute of Earth Sciences, University of Tyumen, Chervishevsky tract Street 13, Tyumen

625008, Russia^2

Laboratory of Biodiversity and Landscape Ecology Tomsk State University, Lenin Avenue 36, Tomsk

634050, Russia^3

Institute of Biology, Tomsk State University, Lenin Avenue 36, Tomsk

634050, Russia^4

关键词: Aeolian sediments;    Anthropogenic dynamics;    Fluvial terraces;    Geochemical barriers;    Granulometric properties;    Humus accumulations;    Radial migration;    Soil development;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/201/1/012010/pdf
DOI  :  10.1088/1755-1315/201/1/012010

学科分类：生物科学（综合）

来源: IOP

【 摘 要 】

Aeolian sands and ancient dune fields are widely widespread in the southern part of Western Siberia. Aeolian landscapes formed in the bottom part of large ancient valleys, on the surfaces of modern fluvial terraces and near large lake systems are characterized by the unique soil cover which is determent by the sedimentalogical, mineralogical and granulometric properties of sands and very slightly dependent from local vegetation and climate. Soils of ancient inland dune landscapes located within the ancient valleys of Ob-Tom interfluve were investigated. It was shown that local topography is the main factor controlling the diversity of soils. Soils developed in dune topographical sequences differ from each other in the thickness of eluvial-illuvial horizons, content of humus and oxalate-extractable iron. Humus accumulation and podsolization process are rather poor because of the low ash content in the litter, intensive natural and anthropogenic dynamics of aeolian landscapes and adjacent soils. The fact that processes of lateral podsolization determine the processes of soil development in such landscapes has been established. All soils are characterized by a small thickness of the modern profile - 50 cm and even less for the flat surfaces of dunes. Clayey lamellaes typical for aeolian sediments are present in the bottom parts of soils profiles, located in the lower part of the dune-interdune sequence. It is rather obvious that thick cemented lamellaes are a powerful soil-geochemical barriers that largely determines the conditions for lateral and radial migration.