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Том 74, № 4 (2019)

Genesis and Geography of Soils

The Dynamics of Plant Debris Input and of Some Properties of Forest Litters during Postagrogenic Reforestation under the Conditions of Southern Taiga

Telesnina V., Bogatyrev L., Benediktova A., Zemskov P., Maslov M.

Аннотация

A comparative description of the structural and functional organization of plant debris and forest litter during natural postagrogenic reforestation in the 12-, 40-, and 100-year-long chronoseries of ecosystems is given. With the increase in the age of forests, the total reserves and diversity of litters rise; and the portion of easily decomposed components and their pH and ash content become smaller. The grass ground cover is replaced by grass–dwarf-shrub cover, which indicates a decrease in the trophicity of ecosystems. The properties of forest litter are adequately reflected in the ground cover composition. Forest restoration is accompanied by a regular decrease in the decomposition intensity of the ground detritus and in the rate of the biological cycle. The spatial differentiation of litters plays a role of a trigger for the subsequent divergence of soil organic profiles.

Moscow University Soil Science Bulletin. 2019;74(4):139-145
pages 139-145 views

Ecological State of Soils and Tree Vegetation in Urban Park-recreational Landscapes (Based on the Example of Catherine Park in Moscow)

Stoma G., Romanova L.

Аннотация

The influence of anthropogenic activity on the quality of urban alluvial soils and conditions of growth and state of tree stands is estimated. The level of negative consequences for natural components is correlated with the degree of human effect. Moisture decreases, the humus content changes in different directions, and the pH of water and electrical conductivity increase in the soil profile. Soil densification and the inhibition of biological activity are recorded in the surface horizons. The coefficient of ecological state of soils decreases by 6–24% compared to the optimum conditions. The correlation analysis showed a significant weak inverse correlation between the state of vegetation and soil quality (the Spearman coefficient was –0.53).

Moscow University Soil Science Bulletin. 2019;74(4):146-153
pages 146-153 views

Biochemical Stability of Water-Soluble Organic Matter in Litter of Iron-Illuvial Podzol before and after Interaction with Mineral Horizons

Karavanova E., Zolovkina D., Stepanov A.

Аннотация

Mineralization resistance of water-soluble organic matter (WSOM) extracted from litter of podzol becomes higher upon the interaction with mineral horizons. Both the portion of WSOM susceptible to mineralization and its mean decomposition rate decrease two and three times, respectively, after its migration through the E eluvial horizon. Sorption in the BF horizon enhances the stability of the input organic matter. The relative content of mineralized carbon decreases to 2% (eight times). In natural soils, adsorbed organic matter may be even more resistant to mineralization due to lower temperatures and biological activity and thus represent the basis for the formation of humus reserve. Taking into account the calculated mineralization rate, the organic carbon accumulation in the BF horizon as a result of WSOM sorption may reach 13.5 mg/100 g per year, but it depends on the concentration of organic substances in soil solutions, hydrological regime, and other factors.

Moscow University Soil Science Bulletin. 2019;74(4):154-159
pages 154-159 views

Long-Term Dynamics of Snow Depth and Snow Composition in Terms of the Geochemical Landscape of Upper Reaches of the Klyazma River

Bogatyrev L., Zhilin N., Zemskov F., Karpukhin M., Benediktova A., Vartanov A., Zavgorodnyaya Y., Demin V.

Аннотация

The dynamics of snow depth and snow composition in the period of 2013–2018 has been discussed. The annual snow cover dynamics is characterized by the alternation of high and low values. The highest values were typical for winter of 2012/2013 followed by a decrease in 2013/2014. The leading role in the snow cover distribution belongs to the elementary landscape position within the geochemical landscape. Over the research years, the water equivalent of snow cover has been characterized by a bicarbonate–calcium composition. Contents of minor components have been generally of the same order of magnitude as the results obtained for the South Taiga landscapes. Some excess of individual components in the snow water in comparison with Мeshchera and Baikal landscapes, taken as a background, is due to the proximity of the studied geochemical landscape and the M-10 main road (Moscow–St. Petersburg). It is assumed that a relatively high Ca content in the snow water of the superaqueous landscape is related to a possible Ca arrival from external meadow–marsh carbonate soils boiling from the surface. Sulfate ion has been found out to play a key role in the diagnosis of atmogeochemical pollution which has been partially established for the studied landscapes.

Moscow University Soil Science Bulletin. 2019;74(4):160-168
pages 160-168 views

Experience in the Use of Russian Soil Classification and Diagnosis in the Systematics of Peat Soils of Oligotrophic Bogs in the North Taiga Subzone of West Siberia

Avetov N., Kuznetsov O., Shishkonakova E.

Аннотация

Currently, the taxonomy of peat soils is not given more attention, especially with regard to taxonomic units in the species rank. The diagnostics of 51 soil profiles in the various oligotrophic mire types in the Numto Nature Park (north taiga subzone of West Siberia) has brought about proposals to improve the existing soil classification. It is suggested to: 1) limit the peat horizon thickness in the peat-gleyzem type to 30 cm; 2) divide the peat-gleyzem type by the trophic status into oligotropic and eutrophic subtypes; 3) expand the list of taxa determined by the botanical composition of peat by means of the division of soil species into subspecies on the basis of classifications of peat and peat deposits; 4) use current vegetation as one of the main diagnostic (indicative) criteria in determining the soil type in mires; and 5) use the degree of decomposition of the peat layer underlying the peat soil for determining the variety of peat soil. The article draws attention to the difficulties in determining the classification position of soils of frozen large mounds in palsa bogs and proposes alternative solutions to this problem.

Moscow University Soil Science Bulletin. 2019;74(4):169-178
pages 169-178 views

Grain-Size Composition of Bottom Sediments of the Simmy River in the Bolon Nature Reserve

Kharitonova G., Ostrouhov A., Tjugaj Z., Krutikova V.

Аннотация

The composition of bottom sediments in the Simmy River (the Amur River tributary, the Bolon Nature Reserve, Khabarovsk krai, Russia) was studied using laser diffractometry, sedimentation analysis, and electron microscopy. It was found that the grain-size composition of sediments from the area treated was mainly constituted by small-size grains and characterized by the accumulation of fine sand which conformed to lacustrine–alluvial genesis of the territory. The sediments in the near-mouth area were mainly formed by particulate alluvium with prevailing silty fraction. The definitive effect on the composition of sediments is exerted by hydrological conditions of Lake Bolon receiving the riverine waters: the variations in the lake water level conform to those in the Amur River. It was shown that the coagulation and precipitation of suspended solids at low content of organic matter (below 1%) resulted in the appearance of volume-aggregated dense and viscous sediments. A higher content of organic matter (>6% in the Kirpu tributary of the Simmy River) caused the “nodal” differentiation of volume-aggregated spatial structures to form porous microaggregates.

Moscow University Soil Science Bulletin. 2019;74(4):179-186
pages 179-186 views

Ecological Safety

Analysis of the State of the Soil Microbial System under Prolonged Anthropogenic Load

Emer N., Kostina N., Netrusov A., Zhebrak I., Kozhevin P.

Аннотация

The paper presents a comparative analysis of the structural and functional characteristics of microbial communities of gray forest soil of fallow and intensively cultivated areas. The long-term anthropogenic impact with massive annual mineral fertilization when growing a monoculture of potatoes has led to degradation of the soil microbial system. A catastrophic decrease in the functional potential of the microbial system (environmental services) is shown using eco-exergy as a thermodynamic indicator of soil “health”.

Moscow University Soil Science Bulletin. 2019;74(4):187-192
pages 187-192 views

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