Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

: материалы временных коллективов / A. S. Prokushkin [и др.] // Boreal forests in a changing world: challenges and needs for action: Proceedings of the International conference August 15-21 2011, Krasnoyarsk, Russia. - Krasnoyarsk : V.N. Sukachev Institute of forest SB RAS, 2011. - С. 346-350. - Библиогр. в конце ст.
Аннотация: Annual dissolved organic (DOC) and inorganic (DIC) carbon concentrations and fluxes in rivers were obtained for 5 large-scale watersheds (15,000-174,000 km2) within Central Siberian Plateau (Yenisey River basin). There are two contamporary limitations of terrigenic C export across Siberia: (1) mobilization of available pools of C is constrained by low precipitation in severe climate of interior Siberia, and (2) low productivity of ecosystems, show weathering rates and/or wildfire disturbance lessen the mobilezeable pools of organic and inorganic C.

Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28

Доп.точки доступа:
Prokushkin, Anatoly Stanislavovich; Прокушкин, Анатолий Станиславович; Korets, Mikhail Anatol'yevich; Корец, Михаил Анатольевич; Rubtsov, A.V.; Рубцов А.В.; Prokushkin, Stanislav Grigor'yevich

/ M. L. Bagard [et al.] // Geochim. Cosmochim. Acta. - 2013. - Vol. 114. - P169-187, DOI 10.1016/j.gca.2013.03.038. - Cited References: 104. - We thank T. Bullen and two anonymous reviewers for their thorough and constructive reviews and A. Jacobson for editorial handling. S. Gangloff is thanked for her assistance with Ca isotope chemistry and T. Perrone for his help in measuring Sr isotopes. This work was supported by the French INSU-CNRS program "EC2CO-Cytrix", and CNRS program "GDRI CAR-WET-SIB, ANR "Arctic Metals", programs of presidium UroRAS and RAS. It was also supported by the funding from the Region Alsace, France, and the CPER 2003-2013 "REALISE". MLB benefited the funding of a Ph.D. scholarship from the French Ministry of National Education and Research. This is an EOST-LHyGeS contribution. . - 19. - ISSN 0016-7037РУБ Geochemistry & Geophysics

Аннотация: Stable Ca and radiogenic Sr isotope compositions were measured in different compartments (stream water, soil solutions, rocks, soils and soil leachates and vegetation) of a small permafrost-dominated watershed in the Central Siberian Plateau. The Sr and Ca in the area are supplied by basalt weathering and atmospheric depositions, which significantly impact the Sr isotopic compositions. Only vegetation significantly fractionates the calcium isotopes within the watershed. These fractionations occur during Ca uptake by roots and along the transpiration stream within the larch trees and are hypothesised to be the result of chromatographic processes and Ca oxalate crystallisations during Ca circulation or storage within plant organs. Biomass degradation significantly influences the Ca isotopic compositions of soil solutions and soil leachates via the release of light Ca, and organic and organo-mineral colloids are thought to affect the Ca isotopic compositions of soil solutions by preferential scavenging of Ca-40. The imprint of organic matter degradation on the delta Ca-44/40 of soil solutions is much more significant for the warmer south-facing slope of the watershed than for the shallow and cold soil active layer of the north-facing slope. As a result, the available stock of biomass and the decomposition rates appear to be critical parameters that regulate the impact of vegetation on the soil-water system in permafrost areas. Finally, the obtained delta Ca-44/40 patterns contrast with those described for permafrost-free environments with a much lower delta Ca-44/40 fractionation factor between soils and plants, suggesting specific features of organic matter decomposition in permafrost environments. The biologically induced Ca isotopic fractionation observed at the soil profile scale is not pronounced at the scale of the streams and large rivers in which the delta Ca-44/40 signature may be controlled by the heterogeneity of lithological sources. (C) 2013 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Bagard, Marie-Laure
Schmitt, Anne-Desiree
Chabaux, Francois
Stille, Peter] Univ Strasbourg, F-67084 Strasbourg, France
[Bagard, Marie-Laure
Schmitt, Anne-Desiree
Chabaux, Francois
Stille, Peter] CNRS, EOST, LHyGeS, F-67084 Strasbourg, France
[Schmitt, Anne-Desiree] Univ Franche Comte, CNRS, UMR 6249, F-25030 Besancon, France
[Pokrovsky, Oleg S.
Viers, Jerome] Univ Toulouse 3, CNRS, UMR 5563, Geosci & Environm Toulouse, F-31400 Toulouse, France
[Pokrovsky, Oleg S.] Russian Acad Sci, Inst Ecol Problems North, Arkhangelsk, Russia
[Labolle, Francois] Univ Strasbourg, Inst Zool & Biol Gen, F-67000 Strasbourg, France
[Prokushkin, Anatoly S.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28

Доп.точки доступа:
Bagard, M.L.; Schmitt, A.D.; Chabaux, F...; Pokrovsky, O.S.; Viers, J...; Stille, P...; Labolle, F...; Prokushkin, A.S.

/ O. S. Pokrovsky [et al.] // C. R. Geosci. - 2012. - Vol. 344, Is. 11.12.2013. - P663-677, DOI 10.1016/j.crte.2012.08.003. - Cited References: 81. - This work was supported by ANR "Arctic Metals", LIA "LEAGE", PICS No. 6063, GDRI "CAR WET SIB", grants RFBR-CNRS Nos 12-05-91055, 08-05-00312_a, 07-05-92212-CNRS_a, 08-04-92495-CNRS_a, CRDF RUG1-2980-KR10, Federal Program RF "Kadry" (contract N 14.740.11.0935), and Programs of Presidium RAS and UrORAS. . - 15. - ISSN 1631-0713РУБ Geosciences, Multidisciplinary

Аннотация: Warming of the permafrost accompanied by the release of ancient soil organic carbon is one of the most significant environmental threats within the global climate change scenario. While the main sites of permafrost carbon processing and its release to the atmosphere are thermokarst (thaw) lakes and ponds, the main carriers of carbon and related major and trace elements from the land to the Arctic ocean are Russian subarctic rivers. The source of carbon in these rivers is atmospheric C consumed by chemical weathering of rocks and amplified by plant uptake and litter decomposition. This multidisciplinary study describes results of more than a decade of observations and measurements of elements fluxes, stocks and mechanisms in the Russian boreal and subarctic zone, from Karelia region to the Kamchatka peninsula, along the gradient of permafrost-free terrain to continuous permafrost settings, developed on various lithology and vegetation types. We offer a comprehensive, geochemically-based view on the functioning of aquatic boreal systems which quantifies the role of the following factors on riverine element fluxes: (1) the specificity of lithological substrate; (2) the importance of organic and organo-mineral colloidal forms, notably during the snowmelt season; (3) the phenomenon of lakes seasonal overturn; (4) the role of permafrost within the small and large watersheds; and (5) the governing role of terrestrial vegetation in element mobilization from rock substrate to the river. Care of such a multiple approach, a first order prediction of the evolution of element stocks and fluxes under scenario of progressive warming in high latitudes becomes possible. It follows the increase of frozen peat thawing in western Siberia will increase the stocks of elements in surface waters by a factor of 3 to 10 whereas the increase of the thickness of active layer, the biomass and the primary productivity all over permafrost-affected zone will bring about a short-term increase of elements stocks in labile reservoir (plant litter) and riverine fluxes by a factor of 2. The change of the plant productivity and community composition under climate warming in central Siberia will be the most important factor of major and trace element fluxes increase (probably a factor of 2) from the soil to the river and, finally, to the Arctic Ocean. (c) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

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Держатели документа:
[Pokrovsky, Oleg S.
Viers, Jerome
Dupre, Bernard
Audry, Stephane] Univ Toulouse, CNRS IRD OMP, Geosci Environm Toulouse, F-31400 Toulouse, France
[Chabaux, Francois] CNRS, EOST, UMR 7517, CGS, F-67084 Strasbourg, France
[Gaillardet, Jerome] Inst Phys Globe Strasbourg Paris, Equipe Geochim Cosmochim, F-75005 Paris, France
[Prokushkin, Anatoly S.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk, Russia
[Shirokova, Liudmila S.] Russian Acad Sci, Inst Ecol Problems N, Arkhangelsk, Russia
[Kirpotin, Sergey N.] Tomsk State Univ, Tomsk 634050, Russia
[Lapitsky, Sergey A.] Moscow MV Lomonosov State Univ, Geol Fac, Moscow, Russia
[Shevchenko, Vladimir P.] RAS, PP Shirshov Oceanol Inst, Moscow 117901, Russia

Доп.точки доступа:
Pokrovsky, O.S.; Viers, J...; Dupre, B...; Chabaux, F...; Gaillardet, J...; Audry, S...; Prokushkin, A.S.; Shirokova, L.S.; Kirpotin, S.N.; Lapitsky, S.A.; Shevchenko, V.P.

[Text] / A. S. Prokushkin [et al.] // Environ. Res. Lett. - 2011. - Vol. 6, Is. 4. - Ст. 45212, DOI 10.1088/1748-9326/6/4/045212. - Cited References: 63. - This work was supported by the joint US-Russia program between the RFBR and CRDF through grants 10-05-92513 and RUG1-2980-KR-10. Additional support was provided by joint Russian-French Programmes EC2CO, Environement Cotier PNEC and GDRI CAR-WET-SIB, ANR 'Arctic metals' and grant 11.G34.31.0014 of Russian Ministry of higher education and science. We greatly thank Sergey Tenishev for assistance with sample collection during harsh winter and spring periods, and Vladimir Ivanov who provided invaluable daily discharge data for the Nizhnyaya Tunguska and Tembenchi Rivers. We thank three anonymous reviewers for their fruitful and constructive comments that allowed improving greatly the quality of presentation. . - 14. - ISSN 1748-9326РУБ Environmental Sciences + Meteorology & Atmospheric Sciences

Аннотация: Frequent measurements of dissolved organic (DOC) and inorganic (DIC) carbon concentrations in rivers during snowmelt, the entire ice-free season, and winter were made in five large watersheds (15 000-174 000 km(2)) of the Central Siberian Plateau (Yenisey River basin). These differ in the degree of continuous permafrost coverage, mean annual air temperature, and the proportion of tundra and forest vegetation. With an annual DOC export from the catchment areas of 2.8-4.7 gC m(-2) as compared to an annual DIC export of 1.0-2.8 gC m(-2), DOC was the dominant component of terrigenous C released to rivers. There was strong temporal variation in the discharge of DOC and DIC. Like for other rivers of the pan-arctic and boreal zones, snowmelt dominated annual fluxes, being 55-71% for water runoff, 64-82% for DOC and 37-41% for DIC. Likewise, DOC and DIC exhibited also a strong spatial variation in C fluxes, with both dissolved C species decreasing from south to north. The rivers of the southern part of the plateau had the largest flow-weighted DOC concentrations among those previously reported for Siberian rivers, but the smallest flow-weighted DIC concentrations. In the study area, DOC and DIC fluxes were negatively correlated with the distribution of continuous permafrost and positively correlated with mean annual air temperature. A synthesis of literature data shows similar trends from west to east, with an eastward decrease of dissolved C concentrations and an increased proportion of DOC in the total dissolved C flux. It appears that there are two contemporary limitations for river export of terrigenous C across Siberia: (1) low productivity of ecosystems with respect to potentially mobilizable organic C, slow weathering rates with concomitant small formation of bicarbonate, and/or wildfire disturbance limit the pools of organic and inorganic C that can be mobilized for transport in rivers (source-limited), and (2) mobilization of available pools of C is constrained by low precipitation in the severe continental climate of interior Siberia (transport-limited). Climate warming may reduce the source limitation by enhancing primary production and weathering rates, while causes leading to surmounting the transport limitation remain debatable due to uncertainties in predictions of precipitation trends and other likely sources of reported increase of river discharges.

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Держатели документа:
[Prokushkin, A. S.
Korets, M. A.
Prokushkin, S. G.] VN Sukachev Inst Forest SB RAS, Krasnoyarsk 660036, Russia
[Pokrovsky, O. S.
Shirokova, L. S.
Viers, J.] Univ Toulouse 3, CNRS, IRD, LMTG OMP, F-31400 Toulouse, France
[Amon, R. M. W.] Texas A&M Univ, Dept Marine Sci, Galveston, TX 77553 USA
[Guggenberger, G.] Leibniz Univ Hannover, Inst Bodenkunde, D-30419 Hannover, Germany
[McDowell, W. H.] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA

Доп.точки доступа:
Prokushkin, A.S.; Pokrovsky, O.S.; Shirokova, L.S.; Korets, M.A.; Viers, J...; Prokushkin, S.G.; Amon, RMW; Guggenberger, G...; McDowell, W.H.

[Text] / M. L. Bagard [et al.] // Geochim. Cosmochim. Acta. - 2011. - Vol. 75, Is. 12. - P3335-3357, DOI 10.1016/j.gca.2011.03.024. - Cited References: 80. - This work benefited from fruitful discussions with S. Derenne, J. Templier, and T. Weber and from thorough reviews by S. Gislason, Ed Tipper and an anonymous reviewer. We also thank the associate Editor S. Hemming. B. Kieffel, Th. Perronne and E. Pelt are acknowledged for their help in measuring U and Sr isotope ratios. This work was financially supported by the French INSU-CNRS program "EC2CO-Cytrix", and CNRS program "GDRI Car-Wet-Sib". It was also supported by the funding from the Region Alsace, France, and the CPER 2003-2013 "REALISE". MLB benefited the funding of a Ph.D. scholarship from the French Ministry of National Education and Research. This is an EOST-LHyGeS contribution. . - 23. - ISSN 0016-7037РУБ Geochemistry & Geophysics

Аннотация: In order to constrain the origin and fluxes of elements carried by rivers of high latitude permafrost-dominated areas, major and trace element concentrations as well as Sr and U isotopic ratios were analyzed in the dissolved load of two Siberian rivers (Kochechum and Nizhnyaya Tunguska) regularly sampled over two hydrological cycles (2005-2007). Large water volumes of both rivers were also collected in spring 2008 in order to perform size separation through dialysis experiments. This study was completed by spatial sampling of the Kochechum watershed carried out during summer and by a detailed analysis of the main hydrological compartments of a small watershed. From element concentration variations along the hydrological cycle, different periods can be marked out, matching hydrological periods. During winter baseflow period (October to May) there is a concentration increase for major soluble cations and anions by an order of magnitude. The spring flood period (end of May-beginning of June) is marked by a sharp concentration decrease for soluble elements whereas dissolved organic carbon and insoluble element concentrations strongly increase. When the spring flood discharge occurs, the significant increase of aluminum and iron concentrations is related to the presence of organo-mineral colloids that mobilize insoluble elements. The study of colloidal REE reveals the occurrence of two colloid sources successively involved over time: spring colloids mainly originate from the uppermost organic-rich part of soils whereas summer colloids rather come from the deep mineral horizons. Furthermore, U and Sr isotopic ratios together with soluble cation budgets in the Kochechum river impose for soluble elements the existence of three distinct fluxes over the year: (a) at the spring flood a surface flux coming from the leaching of shallow organic soil levels and containing a significant colloidal component (b) a subsurface flux predominant during summer and fall mainly controlled by water-rock interactions within mineral soils and (c) a deep groundwater flux predominant during winter which enters large rivers through unfrozen permafrost-paths. Detailed study of the Kochechum watershed suggests that the contribution of this deep flux strongly depends on the depth and continuous nature of the permafrost. (C) 2011 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Bagard, Marie-Laure
Chabaux, Francois
Stille, Peter
Rihs, Sophie] Univ Strasbourg, F-67084 Strasbourg, France
[Bagard, Marie-Laure
Chabaux, Francois
Stille, Peter
Rihs, Sophie] CNRS, EOST, LHyGeS, F-67084 Strasbourg, France
[Pokrovsky, Oleg S.
Viers, Jerome
Dupre, Bernard] Observ Midi Pyrenees, UMR 5563, CNRS, LMTG, Paris, France
[Prokushkin, Anatoly S.] SB RAS, VN Sukachev Inst Forest, Krasnoyarsk, Russia
[Schmitt, Anne-Desiree] Univ Franche Comte, CNRS, UMR 6249, F-25030 Besancon, France

Доп.точки доступа:
Bagard, M.L.; Chabaux, F...; Pokrovsky, O.S.; Viers, J...; Prokushkin, A.S.; Stille, P...; Rihs, S...; Schmitt, A.D.; Dupre, B...

[Text] / O. S. Pokrovsky [et al.] // Chem. Geol. - 2013. - Vol. 355. - P103-116, DOI 10.1016/j.chemgeo.2013.07.016. - Cited References: 65. - We are grateful to Associate Editor Carla Koretsky for her significant efforts in improving this manuscript and two anonymous reviewers for their helpful and constructive comments. This work was supported by the BIO-GEO-CLIM Mega-grant of the Ministry of Education and Science of the Russian Federation and Tomsk State University (No 14.B25.31.0001), ANR "Arctic Metals", GDRI CAR WET SIB and LIA LEAGE International Laboratories, Grants RFFI 10-05-92513, and 11-04-10056, the CRDF RUG1-2980-KR-10 and Programs of Presidium RAS (No 12-P-5-1021) and UrORAS (No 12-U-5-1034). . - 14. - ISSN 0009-2541РУБ Geochemistry & Geophysics

Аннотация: This work is devoted to the characterization of natural mechanisms of silicon isotope fractionation within Siberian watersheds and predicting the climate warming effect on Si fluxes from the land to the Arctic Ocean. To unravel the different sources of silica generated by basalt weathering in Central Siberia under permafrost and larch deciduous forest conditions, we measured the Si isotopic composition of large and small rivers, surface flow, interstitial soil solutions, plant litter and soils. The average annual discharge-weighted delta Si-30 values of the second largest tributary of the Yenissei River, Nyzhnaya Tunguska and its main northern tributary (Kochechum) are equal to 1.08 +/- 0.10% and 1.67 +/- 0.15%, respectively, while their average annual Si concentrations are very similar (3.46 and 3.50 mg/L, respectively). During summer baseflow, the dissolved Si isotope composition of both large rivers and a small stream ranges between 1.5 and 2.5%. This is much heavier compared to the source basaltic rocks but similar to the fresh litter of Larix gmelinii, the dominating tree species in this region. It could be consistent with litter degradation in the uppermost soil horizons being the dominant source of solutes annually exported by Central Siberian rivers. During spring flood, accounting for 60-80% of annual Si flux, the delta Si-30 of the large rivers' dissolved load decreases by 1-1.5%, thus approaching the value of the bedrock and the silicate suspended matter of the rivers (RSM). This may reflect the dissolution of the silicate suspended load at high water/mineral ratio. The winter delta Si-30 values of the large river dissolved load range between 1.0 and 2.5%. During this period, contributing to <= 10% of the annual Si chemical flux, the interaction between bedrock (porous tuffs) and deep ground waters occurs at a very high solid/solution ratio, leading to the precipitation of isotopically light secondary minerals and enrichment of Si-30 in the fluids that feed the river through the unfrozen flowpaths. Results of this study imply that more than a half of the silica transported by Siberian rivers may transit through the biogenic pool and that, like in other stable basaltic regions, bedrock-water interactions account for a lesser fraction of the silica flux. As a result of projected future climate warming and weathering increases in boreal regions, the delta Si-30 isotopic composition of large Siberian rivers is likely to shift towards less positive values. (c) 2013 Elsevier B.V. All rights reserved.

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Держатели документа:
[Pokrovsky, O. S.
Schott, J.
Viers, J.] Univ Toulouse, GET CNRS UMR 5563, F-31400 Toulouse, France
[Pokrovsky, O. S.] UroRAS, Inst Ecol Problems North, Arkhangelsk, Russia
[Reynolds, B. C.] Swiss Fed Inst Technol, Inst Geochem & Petr, Zurich, Switzerland
[Prokushkin, A. S.] RAS, Inst Forest, Siberian Branch, Krasnoyarsk, Russia

Доп.точки доступа:
Pokrovsky, O.S.; Reynolds, B.C.; Prokushkin, A. S.; Прокушкин, Анатолий Станиславович; Schott, J.; Viers, J.; BIO-GEO-CLIM Mega-grant of the Ministry of Education and Science of the Russian Federation; Tomsk State University [14.B25.31.0001]; ANR "Arctic Metals"; GDRI CAR WET SIB and LIA LEAGE International Laboratories [RFFI 10-05-92513, 11-04-10056]; CRDF [RUG1-2980-KR-10]; Program of Presidium RAS [12-P-5-1021]; Program of Presidium UrORAS [12-U-5-1034]

/ V. Mavromatis [et al.] // Geochim. Cosmochim. Acta. - 2016. - Vol. 191. - P32-46, DOI 10.1016/j.gca.2016.07.003 . - ISSN 0016-7037
Аннотация: This work focuses on the behavior of the stable Mg and Si isotope compositions of the largest Arctic river, the Yenisey River and 28 of its major and minor tributaries during the spring flood period. Samples were collected along a 1500 km latitudinal profile covering a wide range of permafrost, lithology, and vegetation. Despite significant contrasts in the main physico-geographical, climate, and lithological parameters of the watersheds, the isotope composition of both dissolved Mg and Si was found to be only weakly influenced by the degree of the permafrost coverage, type of vegetation (forest vs. tundra), and lithology (granites, basalts, carbonates or terrigenous rocks). This observation is generally consistent with the lack of chemical uptake of Mg and Si by soil mineral formation and vegetation during the early spring. The radiogenic Sr isotope composition of the Yenisey and its tributaries varied within a narrow range (0.708 ? 87Sr/86Sr ? 0.711) reflecting the dominance of Phanerozoic rock weathering and/or atmospheric deposition on these compositions. The Mg and Si isotopic compositions of riverine samples reflect two main processes with distinct isotopic signatures. First, isotopically heavier Mg (?26Mg = ?1.0 ± 0.2‰) and isotopically lighter Si (?30Si = 1.0 ± 0.25‰) are added to the waters by river suspended matter dissolution and leaching from vegetation biomass/topsoil litter. Second, isotopically lighter Mg (?26Mg = ?1.5 to ?1.75‰) and isotopically heavier Si (?30Si = 1.75–2.0‰) are delivered to the Yenisey's tributaries from deep underground water feeding the rivers via taliks. This lighter Mg and heavier Si isotopic composition is interpreted to originate from Precambrian dolomite dissolution and aluminosilicate dissolution coupled with authigenic mineral precipitation, respectively, in deep underground water reservoirs. Taking account of the isotopic composition evolution over the course of the year established earlier on mono-lithological watersheds of the Yenisey basin, the average annual isotopic signatures of the Yenisey river arriving to the Arctic Ocean are estimated to be ?26Mg = ?1.58 ± 0.30‰ and ?30Si = +1.60 ± 0.25‰. As the Yenisey is the largest river feeding the Arctic Ocean and as it samples a large variety of environments and lithologies, these values may be reasonable estimates for the average Mg and Si isotopic composition of the dissolved riverine flux to the Arctic Ocean. © 2016 Elsevier Ltd

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Держатели документа:
Geosciences Environnement Toulouse (GET), CNRS, UMR 5563, Observatoire Midi-Pyrenees, 14 Av. E. Belin, Toulouse, France
Institute of Applied Geosciences, Graz University of Technology, Rechbauerstrasse 12, Graz, Austria
V.N. Sukachev Institute of Forest, SB RAS, Akademgorodok 50/28, Krasnoyarsk, Russian Federation
BIO-GEO-CLIM Laboratory, Tomsk State University, Tomsk, Russian Federation
Institute of Ecological Problems of the North, RAS, 23 Naber. Sev. Dviny, Arkhangelsk, Russian Federation
Earth Sciences, University College London, WC1E 6BT, United Kingdom

Доп.точки доступа:
Mavromatis, V.; Rinder, T.; Prokushkin, A. S.; Pokrovsky, O. S.; Korets, M. A.; Chmeleff, J.; Oelkers, E. H.

/ V. Mavromatis, A. S. Prokushkin, M. A. Korets [et al.] // Chem. Geol. - 2020. - Vol. 540. - Ст. 119547, DOI 10.1016/j.chemgeo.2020.119547 . - ISSN 0009-2541
Аннотация: Constraining the mechanisms controlling the riverine flux of major cations and their isotopes including that of Mg to the World Ocean is one of the challenges in Earth surface isotope geochemistry. In an attempt to identify the main factors affecting the Mg isotopic composition of large rivers including vegetation, climate and lithology of the watershed, we studied the largest, in terms of discharge, Siberian river, Yenisey, and 20 of its main tributaries, during spring flood, summer flow and winter. The working hypothesis was that the influence of bedrock composition is most pronounced in winter, when the soils are frozen and the rivers are fed by deep underground waters. Thus, we anticipated that the presence of permafrost will help to distinguish the impact of surface processes, linked to biological uptake and release, and deep soil/underground transport of Mg from mineral sources. In contrast to these expectations, no sizable differences in the Mg isotope composition of the river water (±0.1‰) for both the Yenisey tributaries and its main channel has been observed between the spring flood (May) and the winter (March) period. Those two periods are characterized by the differences of discharge and degree of lithological impact on element source in the river water. Regardless of the season, there was no straightforward control of lithology (relative abundance of carbonates, basalts, granites and sedimentary rocks) on ?26Mg in the main tributaries of the Yenisey river. Our findings suggest that the use of riverine Mg isotope signature for tracing weathering mechanisms and dominant lithological impact is not straightforward at the scale of large rivers whose watersheds present multiple lithologies, variable climatic conditions and vegetation types. © 2020 Elsevier B.V.

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Держатели документа:
Geosciences Environnement Toulouse (GET), CNRS, UMR 5563, Observatoire Midi-Pyrenees, 14 Av. E. Belin, Toulouse, 31400, France
V.N. Sukachev Institute of Forest, SB RAS, Akademgorodok 50/28, Krasnoyarsk, 660036, Russian Federation
BIO-GEO-CLIM Laboratory, Tomsk State University, Tomsk, Russian Federation
N. Laverov Federal Center for Arctic Research, IEPN, Russian Academy of Science, 23 Naber. Sev. Dviny, Arkhangelsk, Russian Federation

Доп.точки доступа:
Mavromatis, V.; Prokushkin, A. S.; Korets, M. A.; Chmeleff, J.; Mounic, S.; Pokrovsky, O. S.

/ V. Mavromatis, A. S. Prokushkin, M. A. Korets [et al.] // Chem. Geol. - 2020. - Vol. 540. - Ст. UNSP 119547, DOI 10.1016/j.chemgeo.2020.119547. - Cited References:65. - The study was supported by RFFI (RFBR) grant No 19-55-15002 and by the French national programmes INSU-LEFE and INSU-SYSTER. The editor, J. Gaillardet and four anonymous reviewers are thanked for their constructive comments on our manuscript. . - ISSN 0009-2541. - ISSN 1872-6836РУБ Geochemistry & Geophysics

Аннотация: Constraining the mechanisms controlling the riverine flux of major cations and their isotopes including that of Mg to the World Ocean is one of the challenges in Earth surface isotope geochemistry. In an attempt to identify the main factors affecting the Mg isotopic composition of large rivers including vegetation, climate and lithology of the watershed, we studied the largest, in terms of discharge, Siberian river, Yenisey, and 20 of its main tributaries, during spring flood, summer flow and winter. The working hypothesis was that the influence of bedrock composition is most pronounced in winter, when the soils are frozen and the rivers are fed by deep underground waters. Thus, we anticipated that the presence of permafrost will help to distinguish the impact of surface processes, linked to biological uptake and release, and deep soil/underground transport of Mg from mineral sources. In contrast to these expectations, no sizable differences in the Mg isotope composition of the river water (+/- 0.1%) for both the Yenisey tributaries and its main channel has been observed between the spring flood (May) and the winter (March) period. Those two periods are characterized by the differences of discharge and degree of lithological impact on element source in the river water. Regardless of the season, there was no straightforward control of lithology (relative abundance of carbonates, basalts, granites and sedimentary rocks) on delta Mg-26 in the main tributaries of the Yenisey river. Our findings suggest that the use of riverine Mg isotope signature for tracing weathering mechanisms and dominant lithological impact is not straightforward at the scale of large rivers whose watersheds present multiple lithologies, variable climatic conditions and vegetation types.

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Держатели документа:
Observ Midi Pyrenees, CNRS, GET, UMR 5563, 14 Av E Belin, F-31400 Toulouse, France.
SB RAS, VN Sukachev Inst Forest, Akademgorodok 50-28, Krasnoyarsk 660036, Russia.
Tomsk State Univ, BIO GEO CLIM Lab, Tomsk, Russia.
Russian Acad Sci, N Laverov Fed Ctr Arctic Res, IEPN, 23 Naber Sev Dviny, Arkhangelsk, Russia.

Доп.точки доступа:
Mavromatis, Vasileios; Prokushkin, Anatoly S.; Korets, Mikhail A.; Chmeleff, Jerome; Mounic, Stephanie; Pokrovsky, Oleg S.; RFFI (RFBR) [19-55-15002]; French national programmes INSU-LEFE; INSU-SYSTER

/ Y. I. Yershov // Eurasian Soil Sci. - 2021. - Vol. 54, Is. 5. - P653-664, DOI 10.1134/S1064229321050070. - Cited References:38 . - ISSN 1064-2293. - ISSN 1556-195XРУБ Soil Science

Аннотация: At present, the genesis, nomenclature, and classification of granuzems remain debatable, which is explained by scarce data on these soils. In this paper, data on granuzems described in the forest-tundra of the Norilsk depression, in the valleys of the Tukalanda, Akkit, and Khantaika rivers (68 degrees 30 ' N, 88 degrees 15 ' E) and in the northern taiga within the lower reaches of the Nizhnyaya Tunguska River (66 degrees 20 ' N, 89 degrees 00 ' E) are discussed. Genetic and geographic features of granuzems are closely related to the mineralogy and texture of their parent materials represented by moraine and glaciofluvial loamy and clayey sediments derived from quartz-containing dolerites. Granuzems are characterized by the strongly acid or acid to neutral reaction and, accordingly, by the low base saturation in the upper horizons and moderate base saturation in the lower horizons. Granuzems are characterized by the elevated content of humus of the fulvate composition (C-ha/C-fa < 1) and by the high content of oxalate-extractable iron. The main soil-forming processes are weathering and aggregation of the coagulative cryochemogenic nature. The horizon with strong rounded-grain or crumb-granular structure serves as a diagnostic horizon of granuzems. The surface litter horizon may have different thickness and decomposition degree.

WOS

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Sukachev Inst Forest, Akademgorodok 50-28, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Yershov, Yu, I