scholarly journals Agrogenic changes in the properties of dark chestnut virgin and arable soil with different use and irrigation

2021 ◽  
pp. 12-21
Author(s):  
L.I. Vorotyntseva ◽  
◽  
V.I. Nikoliuk ◽  
Keyword(s):  
Ecosystem Services ◽  
Chestnut Soil ◽  
Biosphere Reserve ◽  
Total Content ◽  
Arable Soil ◽  
Water Soluble ◽  
Virgin Soil ◽  
Biological Degradation ◽  
Dark Chestnut Soil ◽  
Agricultural Use

In the article, it was provided a comparative analysis of the ecosystem significance of soil characteristics transformed as a result of changes in the use conditions. At the three monitoring stationary sites in the Chaplinka district of the Kherson region, we studied the properties of dark chestnut soil (Haplic Kastanozem) on virgin lands (a biosphere reserve "Askania-Nova") and with more than a hundred years of use in agricultural production without irrigation and with a 50-year irrigation with water from the Kakhovsky trunk canal. Changes in the salt regime of the soil and the composition of exchangeable cations were established. In irrigation the total content of water-soluble salts up to 0.14-0.21% (toxic salts ‒ up to 0.06-0.15 %) was increased. The composition of salts was changed, their migration and accumulation in the lower soil layers. Under the influence of fresh water irrigation the process of dealkalinization in the dark chestnut soil took place. The involvement of virgin soil in agricultural use led to a decrease in the total content of humus and the transformation of its group composition. The content of humic acids (HA) was decreased. The content of fulvic acids (FA) was increased. The HA/FA ratio in the 0-10 cm layer changed from 2.6 (in virgin soil) to 1.6 in irrigated soil. The plowing and agricultural use of the dark chestnut soil led to a change in the state of the microbial cenosis. The number of microorganisms assimilating mineral and organic nitrogen, actinomycetes, oligotrophs, and eutrophs were increased. With irrigation the degree of transformation of the microbial cenosis increases. The indicator of biological degradation of irrigated dark chestnut soil was 4 %. This corresponds to a low level of degradation. A set of 10 indicators of the quality of the studied soil was proposed for calculating the level of its provision of ecosystem services (supplying and supporting). The algorithm and calculation results are presented. The soil of all monitoring sites of Markeev station is characterized by a high level of provision of ecosystem services. In virgin soil it was 8.3 points; in arable soil without irrigation it was 7.2, and with irrigation it was 7.5 points.

scholarly journals Mobile Forms of Gold and Pathfinder Elements in Surface Sediments at the Novye Peski Gold Deposit and in the Piilola Prospecting Area (Karelia Region)

Minerals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 34 ◽  
Author(s):  
Vera Korshunova ◽  
Marina Charykova
Keyword(s):  
Organic Matter ◽  
Gold Deposit ◽  
Surface Sediments ◽  
Gold Mineralization ◽  
Total Content ◽  
Fulvic Acids ◽  
Water Soluble ◽  
Mobile Form ◽  
Mobile Forms ◽  
Pathfinder Elements

The success of prospecting for gold deposit in overburdened areas based on the using of secondary dispersion haloes mostly depends on the chosen method of geochemical survey (sampling horizon, sample preparation for analysis, etc.). At the same time, the geochemistry of gold in the supergene zone is insufficiently studied, especially it’s migration and concentration in association with other elements in surface sediments due to weathering of gold-bearing ore. The main aim of the study presented in this paper is the determination of mobile forms of gold and pathfinder elements (As, Cu, Ni, Ag, Zn, Pb, Se, Sb, Mo, Bi, and Te) in podzol soil and moraine in the areas of Karelia region with known gold mineralization. As a result of conducted experiments it was determined that the main mobile forms of gold are water-soluble and bound to organic matter, while pathfinder elements bound preferably to Fe and Mn(hydr)oxides and to organic matter. As gold and some pathfinders bind with organic matter, this form was considered in more detail, and the elements’ interaction with humic and fulvic acids was investigated. In addition, it was determined that the studied elements are quite “mobile” because the percentage of the mobile form in their total content was mostly more than 50%. The main features of the elements’ migration and concentration were identified in surface sediments of the study areas.

scholarly journals Plant growth-promoting and antifungal activity of yeasts from dark chestnut soil

2015 ◽  
Vol 175 ◽  
pp. 78-83 ◽  
Author(s):  
Lyudmila V. Ignatova ◽  
Yelena V. Brazhnikova ◽  
Ramza Z. Berzhanova ◽  
Togzhan D. Mukasheva
Keyword(s):  
Antifungal Activity ◽  
Plant Growth ◽  
Chestnut Soil ◽  
Dark Chestnut Soil ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals ater supply from Sierra del Rincón Biosphere Reserve to the Community of Madrid (Spain): An ecosystem services approach

Ecosistemas ◽  
2020 ◽  
Vol 29 (1) ◽  
Author(s):  
Pedro Zorrilla-Miras ◽  
Marta Suárez ◽  
Alberto González-García ◽  
Carolina Sancho Gómez ◽  
Manuel Bea Martínez
Keyword(s):  
Ecosystem Services ◽  
Biosphere Reserve
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