Recent Soil-Forming Processes in Postagrogenic Soddy-Podzolic Soils of the Udmurt Republic

• Published in: Eurasian soil science Vol. 54; no. 7; pp. 1119 - 1129
• Main Authors: Lednev, A. V., Dmitriev, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2021; Springer; Springer Nature B.V
• Subjects: Acidity; Agricultural equipment; Biocenoses; Conservation of Soils; Cultivation; Decomposing organic matter; Degradation; Differentiation; Earth and Environmental Science; Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Humus; Landforms; Podzolic soils; Rehabilitation; Soil; Soil formation; Soil moisture; Soils; Surveys; Transit; agro-landscapes; cultivation rate; Albic Retisol; overgrowing period; layland
• ISSN: 1064-2293; 1556-195X
• DOI: 10.1134/S1064229321070085

We have revealed the dependence of current soil-forming processes in laylands on the period of theirs overgrowing, landform, and cultivation intensity. The main object of research is represented by regraded agrosoddy-podzolic soils (Albic Glossic Retisols (Loamic, Aric, Cutanic, Ochric)), differing in the overgrowing period, cultivation rate, and texture, and located on transit and accumulative elements of the landscape. The soils have been studied during soil-ecological surveys in the Udmurt Republic and in a long-term field experiment. It has been revealed that all major changes in layland soils occur in the former plowed layer, which is subdivided into two sublayers. Humus formation is intensive in the upper 10-cm-thick part of the plow layer, which results in higher humus content, total exchangeable bases, and structure coefficient. The zonal podzolization process is activated in the lower part of the plow layer (from 10- to 20-cm-thick) and results in lower content of humus and exchangeable basis, and in higher acidity. After the 40-year-long period of overgrowing, the properties of these sublayers become similar to those of the AY (gray-humus) and EL (eluvial) horizons of virgin soils, respectively. The changes of all the parameters during layland overgrowing are stepwise. Differentiation of the formed plow layer is the most intensive in soils on transit elements of the catena. More favorable moisture conditions of the accumulative positions in catena result in higher productivity of biocenoses and more intensive humus formation. Differentiation of the former plow layer is more intensive in soils of the increased and high cultivation rate.