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Abstract <p>The influence of hydromorphism and texture of the substrate (loams, sands, gravelly sands) on the processes of initial pedogenesis in the southern shrub tundra of the European northeast of Russia is considered. The morphology of the profiles, physical and physicochemical properties, and chemical composition of mature and young soils are analyzed. It is shown that in the course of 4(5)–6 decades of self-restoration succession in the territory of sand quarries, the processes of soil formation and vegetation development are interconnected and are controlled by the properties of soil-forming rocks. Under conditions of good drainage, young sandy, gravelly sandy, and loamy soils of the quarries display the following features: isolation of organic horizons (litter formation); some loosening (a decrease in bulk density) of the upper mineral part of the profile; and a tendency for redistribution of the clay fraction and sesquioxides in the profile. In loamy soils, gley features are weakly expressed in the upper part of the profile; gravelly sandy soils are characterized by the accumulation of Al and Fe compounds immediately under the litter; and sandy soils acquire some features of podzolization. In the poorly drained waterlogged conditions, peat formation, humus leaching, and gleyzation processes are developed. The processes of initial pedogenesis in the bioclimatic conditions of the tundra are slowed down. This is evidenced by the (a) weak manifestation of zonal signs of soil formation in the profiles of young soils and (b) low rate of organic carbon accumulation in the soil profile. On sandy and gravelly sandy sediments, the rate of carbon accumulation in the upper 20 cm of the soil profile under automorphic conditions is less than 0.1 t/(ha year); it increases in semihydromorphic conditions (0.25–0.30 t/(ha year)) and in hydromorphic conditions (0.42 t/(ha year)). For loamy soils, the rate of humus accumulation at the initial stages of pedogenesis reaches 0.28, 0.31 and 0.61 t/(ha year), respectively.</p>

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Specific Features of Initial Pedogenesis in Southern Tundra of the European Northeast of Russia

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • I. A. Likhanova,
  • S. V. Deneva,
  • E. M. Lapteva

摘要

Abstract

The influence of hydromorphism and texture of the substrate (loams, sands, gravelly sands) on the processes of initial pedogenesis in the southern shrub tundra of the European northeast of Russia is considered. The morphology of the profiles, physical and physicochemical properties, and chemical composition of mature and young soils are analyzed. It is shown that in the course of 4(5)–6 decades of self-restoration succession in the territory of sand quarries, the processes of soil formation and vegetation development are interconnected and are controlled by the properties of soil-forming rocks. Under conditions of good drainage, young sandy, gravelly sandy, and loamy soils of the quarries display the following features: isolation of organic horizons (litter formation); some loosening (a decrease in bulk density) of the upper mineral part of the profile; and a tendency for redistribution of the clay fraction and sesquioxides in the profile. In loamy soils, gley features are weakly expressed in the upper part of the profile; gravelly sandy soils are characterized by the accumulation of Al and Fe compounds immediately under the litter; and sandy soils acquire some features of podzolization. In the poorly drained waterlogged conditions, peat formation, humus leaching, and gleyzation processes are developed. The processes of initial pedogenesis in the bioclimatic conditions of the tundra are slowed down. This is evidenced by the (a) weak manifestation of zonal signs of soil formation in the profiles of young soils and (b) low rate of organic carbon accumulation in the soil profile. On sandy and gravelly sandy sediments, the rate of carbon accumulation in the upper 20 cm of the soil profile under automorphic conditions is less than 0.1 t/(ha year); it increases in semihydromorphic conditions (0.25–0.30 t/(ha year)) and in hydromorphic conditions (0.42 t/(ha year)). For loamy soils, the rate of humus accumulation at the initial stages of pedogenesis reaches 0.28, 0.31 and 0.61 t/(ha year), respectively.