scholarly journals Dependence of Organic Matter’s and Biogenic Elements’ Content on the Rybinsk Reservoir Hydrological Conditions

2015 ◽  
pp. 20-31
Author(s):  
Keyword(s):  
Organic Matter ◽  
Rybinsk Reservoir ◽  
Hydrological Regime ◽  
Biogenic Elements ◽  
Hydrological Conditions ◽  
Crucial Effect ◽  
The Rybinsk Reservoir

This study analyzes hydrological conditions and concentrations of biogenic elements (BE) and organic matter (OM) in the Rybinsk Reservoir for the 2001-2012 period. It also assesses the influence of the reservoir’s hydrological regime on BE and OM. The study suggests that the hydrological regime has a crucial effect on BE and OM concentrations both in seasonal and annual aspects.

Hydrological conditions and peat constitution effect on DOC leaching from permafrost-affected soils: model experiment (Western Siberia, Russia)

2020 ◽  
Author(s):  
Maria Timofeeva ◽  
Olga Goncharova ◽  
Georgy Matyshak
Keyword(s):  
Organic Matter ◽  
Model Experiment ◽  
Hydrological Regime ◽  
Basic Research ◽  
Permafrost Degradation ◽  
Carbon Export ◽  
Peat Soils ◽  
Mineral Horizon ◽  
Hydrological Conditions ◽  
Discontinuous Permafrost

<p>In the northern ecosystems’ soils, the carbon stock is preserved in peat soils which includes frozen peat. It is vulnerable to any climate changes. The permafrost degradation can affect both the quantity and the composition of dissolved organic carbon of permafrost-affected soils, especially peat soils.</p><p>The main aim of our study was to determine the relationship among peat type, water regime and the quantity and composition of water borne carbon export. The research site was located in the discontinuous permafrost zone (N65º18’, E72º52’). Monoliths of various peat soils were collected in summer 2019 for a laboratory experiment.</p><p>The experiments were carried out with 6 types of monoliths (oligotrophic fibric peat; oligotrophic hemic peat with lichen debris; eutrophic hemic peat with reindeer moss debris; eutrophic sapric peat; eutrophic sapric peat with a burnt horizon; oligotrophic fibric peat, underlied with sand). We try to understand how organic matter is leached from peat soils with different constitution and different degree of decomposition. In the model experiment, we simulated 3 types of hydrological conditions. Soil monoliths were watered, and the contents of DOC and POC were determined in the collected soil waters.</p><ol><li>Simulation of the moderate rainfall (70 mm) by adding distilled water during the week. DOC in this case ranged from 44,2±3.0 mg/l in oligotrophic peat to 80,6±28,7 mg/l in eutrophic peat.</li> <li>The simultaneous flow of large quantities of water, simulating prolonged rainfall or spring snowmelt. In this case DOC content leaching from fibric oligotrophic peat didn`t change much while DOC leaching from sapric eutrophic peat decreased in comparison with moderate rainfall.</li> <li>During modeling short stagnant regimen (spring conditions) we observed increase DOC, especially in sapric eutrophic peat (up to 291,0±11,3 mg/l). The mineral horizon under the peat layer reduced the rate of leaching of organic substances from the soil.</li> </ol><p>Our results indicate the significant role of both the peat constitution and hydrological regime of soils on the rate and amount of organic matter entering the hydrological basin from peat permafrost-affected soils. The data can be used to simulate the dynamics of permafrost ecosystems with changing climatic parameters or with the activation of anthropogenic load.</p><p>This research was supported by the Russian Foundation for Basic Research (Grant 18-04-00952)</p>

Simulating of Phytoplankton Development in the Rybinsk Reservoir

2015 ◽  
pp. 32-40
Author(s):  
Keyword(s):  
Water Exchange ◽  
Rybinsk Reservoir ◽  
Vegetation Period ◽  
Diatom Algae ◽  
Algae Biomass ◽  
Internal Water ◽  
Kinetics Of ◽  
The Rybinsk Reservoir

A model of phytoplankton development within a reservoir including the description of kinetics of its interactions in the ecosystem and internal water exchange of the reservoir has been presented. The carried out calculations of changes of the cyanobacteria and diatom algae biomass in the Rybinsk Reservoir in the vegetation period have shown their satisfactory convergence with the fi eld observations data.

scholarly journals Spatiotemporal transformation of dissolved organic matter along an alpine stream flow path on the Qinghai–Tibet Plateau: importance of source and permafrost degradation

2018 ◽  
Vol 15 (21) ◽  
pp. 6637-6648 ◽  
Author(s):  
Yinghui Wang ◽  
Robert G. M. Spencer ◽  
David C. Podgorski ◽  
Anne M. Kellerman ◽  
Harunur Rashid ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Molecular Level ◽  
Tibet Plateau ◽  
Permafrost Degradation ◽  
Hydrological Conditions ◽  
14C Age ◽  
Alpine Stream ◽  
Qinghai Tibet Plateau

Abstract. The Qinghai–Tibet Plateau (QTP) accounts for approximately 70 % of global alpine permafrost and is an area sensitive to climate change. The thawing and mobilization of ice-rich and organic-carbon-rich permafrost impact hydrologic conditions and biogeochemical processes on the QTP. Despite numerous studies of Arctic permafrost, there are no reports to date for the molecular-level in-stream processing of permafrost-derived dissolved organic matter (DOM) on the QTP. In this study, we examine temporal and spatial changes of DOM along an alpine stream (3850–3207 m above sea level) by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), accelerator mass spectrometry (AMS) and UV–visible spectroscopy. Compared to downstream sites, dissolved organic matter (DOM) at the headstream site exhibited older radiocarbon age, higher mean molecular weight, higher aromaticity and fewer highly unsaturated compounds. At the molecular level, 6409 and 1345 formulas were identified as unique to the active layer (AL) leachate and permafrost layer (PL) leachate, respectively. Comparing permafrost leachates to the downstream site, 59 % of AL-specific formulas and 90 % of PL-specific formulas were degraded, likely a result of rapid in-stream degradation of permafrost-derived DOM. From peak discharge in the summer to low flow in late autumn, the DOC concentration at the headstream site decreased from 13.9 to 10.2 mg L−1, while the 14C age increased from 745 to 1560 years before present (BP), reflecting an increase in the relative contribution of deep permafrost carbon due to the effect of changing hydrological conditions over the course of the summer on the DOM source (AL vs. PL). Our study thus demonstrates that hydrological conditions impact the mobilization of permafrost carbon in an alpine fluvial network, the signature of which is quickly lost through in-stream mineralization and transformation.

scholarly journals Development of Rural Ecotourism on the Yurshinsky Island of Rybinsk Reservoir

2020 ◽  
Vol 217 ◽  
pp. 05002
Author(s):  
Svetlana Zamana ◽  
Olga Sorokina ◽  
Dmitriy Shapovalov ◽  
Alexandr Fomin ◽  
Larisa Petrova ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Protected Area ◽  
Rybinsk Reservoir ◽  
Chemical Elements ◽  
Soil Samples ◽  
Tourist Industry ◽  
Toxic Chemical ◽  
Young Branch ◽  
The Given ◽  
The Rybinsk Reservoir

Agroecotourism is a relatively young branch of tourist industry in our country, at the same time it has become very popular abroad. The article considers some problems related to the development of rural ecotourism on the Yurshinsky island of Rybinsk reservoir. Various landscapes can be seen on the Yurshinsky island, escaping flowage of the Rybinsk reservoir area, where unique samples of Russian nature have remained untouched. The territory of island makes 792 hectares, half of its land is occupied by woods, and now all island has a status of specially protected area. Moose breeding farm is recommended to be established as the object of rural ecotourism on the Yurshinsky island, as its operation allows the tourist season last all-year-round. Ecological conditions of the territory need to be assessed before the organization of a moose farm and other objects of agroecotourism. Therefore we selected several soil samples to perform chemical analysis as the soil represents the knot of interrelations in biosphere and a lack or surplus of both vital, and toxic chemical elements in the soil will lead to their lack or surplus in plants grown up on such soils and in animal organisms which eat the given plants.

scholarly journals Assessment of the quality of freshwater ecosystems based on the functional condition of bivalved mollusks

2019 ◽  
Vol 46 (2) ◽  
pp. 214-224
Author(s):  
S. V. Kholodkevich ◽  
A. N. Sharov ◽  
G. M. Chuiko ◽  
T. V. Kuznetsova ◽  
M. V. Gapeeva ◽  
...  
Keyword(s):  
Functional State ◽  
Rybinsk Reservoir ◽  
Functional Condition ◽  
Freshwater Ecosystems ◽  
Gulf Of Finland ◽  
Bivalve Mollusks ◽  
Accumulation Of Metals ◽  
The Rybinsk Reservoir ◽  
The Gulf Of Finland

An approach is proposed for ranking the quality of freshwater ecosystems by the state of bivalve mollusks living in them. Cardioactivity indicators and accumulation of metals in the tissues of the mollusks from various waters of the eastern part of the Gulf of Finland and the Rybinsk Reservoir were used to characterize the ecosystems, and an original hyperosmotic test was used to analyze the functional state of the mollusks.

scholarly journals ЗАКОНОМІРНОСТІ ФОРМУВАННЯ ФІТОПЛАНКТОНУ ЗА РІЗНИХ КОНЦЕНТРАЦІЙ БІОГЕННИХ ЕЛЕМЕНТІВ ТА ОРГАНІЧНОЇ РЕЧОВИНИ

2019 ◽  
Vol 75 (1) ◽  
pp. 43-51
Author(s):  
O. V. Kravtsova ◽  
V. I. Scherbak ◽  
M. I. Linchuk
Keyword(s):  
Organic Matter ◽  
Green Algae ◽  
Seasonal Dynamics ◽  
Inorganic Nitrogen ◽  
Biogenic Elements ◽  
Hydrochemical Regime ◽  
Dissolved Phosphorus ◽  
Growing Seasons ◽  
Total Inorganic Nitrogen ◽  
Plankton Communities

The seasonal dynamics of the concentration of nutrients in the form of inorganic nitrogen (NH4+, NO2, NO3-, ΣN), dissolved phosphorus, organic matter and the connection with the development of phytoplankton in waters with high content of total inorganic nitrogen (from 23.31 to 102.65 mg N/dm3) and its compounds (ammonia - from 8.42 to 76.60, nitrate - from 4.94 to 15.93, nitrite - from 0.077 to 4.35 mg N/dm3) and organic matter (from 8.00 to 21.92 mg O/dm3 by permanganate oxidation values and from 58.46 to 265.2 mg O/dm3 by dichromate oxidation values) were analyzed in paper. The peculiarity of the hydrochemical regime of the reservoirs was phenomenally high relations ΣN:P (133,54-12152,86) during the growing seasons. Found that response algal plankton communities such features hydrochemical regime is a simplification of the structure due to the predominance of representatives of departments Euglenophyta, Chlorophyta and Bacillariophyta, while Chrysophyta, Dinophyta, Charophyta and presented Cryptophyta 1-3 species. The response of phytoplankton to the high content of compounds of inorganic nitrogen is the increase in the number and biomass of green algae, and organic matter - eugenic algae.THE REGULARITIES OF PHYTOPLANKTON FORMATION AT VARIOS BIOGENIC ELEMENTS AND ORGANIC MATTER CONCENTRATIONS 

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