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

/ M. I. Makarov [et al.] // Eurasian Soil Sci. - 2013. - Vol. 46, Is. 7. - P778-787, DOI 10.1134/S1064229313070053. - Cited References: 32. - This study was supported by the Russian Foundation for Basic Research (project no. 10-04-00780). . - 10. - ISSN 1064-2293РУБ Soil Science

Аннотация: The drying of samples of mountain-meadow soils characterized by their permanently high moisture under natural conditions fundamentally changes the concentrations of the labile nitrogen and carbon compounds, as well as the patterns of their microbial transformation. When the soil samples are dried, a four- to fivefold increase in the content of the extractable organic nitrogen compounds, carbon compounds, and inorganic nitrogen compounds is observed, while the content of nitrogen and carbon of the microbial biomass decreases by two-three times. The rewetting of the dried soil launches the process of the replenishment of the nitrogen and carbon reserves in the microbial biomass. However, even after two weeks of incubation, their values were 1.5-2 times lower than the initial values typical of the natural soil. The restoration of the microbial community in the samples of the previously dried soils occurs in the absence of a deficiency of labile organic compounds and is accompanied by their active mineralization and the low uptake of ammonium nitrogen by the microorganisms.

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Makarov, M. I.
Mulyukova, O. S.
Malysheva, T. I.] Moscow MV Lomonosov State Univ, Fac Soil Sci, Moscow 119992, Russia
[Menyailo, O. V.] Russian Acad Sci, Siberian Branch, Sukachev Inst Forestry, Krasnoyarsk, Russia

Доп.точки доступа:
Makarov, M.I.; Mulyukova, O.S.; Malysheva, T.I.; Menyailo, O.V.

[Text] / O. V. Menyailo, W. R. Abraham, R. . Conrad // Soil Biol. Biochem. - 2010. - Vol. 42, Is. 1. - P101-107, DOI 10.1016/j.soilbio.2009.10.005. - Cited References: 50. - We thank Esther Surges for the isotope ratio measurements, Svetlana Dedysh and Peter Frenzel for discussion of the data. The funding was provided by the Alexander von Humboldt Foundation, Marie Curie Fellowship and by the Russian President Award for best professors awarded to OVM. . - 7. - ISSN 0038-0717РУБ Soil Science

Аннотация: Plant species exert strong effects on ecosystem functions and one of the emerging, and difficult to test hypotheses, is that plants alter soil functions through changing the community structure of soil microorganisms. We tested the hypothesis for atmospheric CH4 oxidation by using soil samples from a Siberian afforestation experiment and exposing them to C-13-CH4. We determined the activity of the soil methanotrophs under different tree species at three levels of initial CH4 concentration (30, 200 and 1000 ppm) thus distinguishing the activities of low- and high-affinity methanotrophs. Half of the samples were incubated with C-13-enriched CH4 (99.9%) and half with C-12-CH4. This allowed an estimation of the amount of C-13 incorporated into individual PLFAs and determination of PLFAs of methanotrophs involved in CH4 oxidation at the different CH4 concentrations. Tree species strongly altered the activity of atmospheric CH4 oxidation without appearing to change the composition of high-affinity methanotrophs as evidenced by PLFA C-13 labeling. The low diversity of atmospheric CH4 oxidizers, presumably belonging to the UCS alpha group, may explain the lack of tree species effects on the composition of soil methanotrophs. We submit that the observed tree species effects on atmospheric CH4 oxidation indicate an effect on biomass or cell-specific activities rather than by a community change and this may be related to the impact of the tree species on soil N cycling. (C) 2009 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Menyailo, Oleg V.] SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
[Menyailo, Oleg V.
Conrad, Ralf] Max Planck Inst Terr Microbiol, D-35043 Marburg, Germany
[Abraham, Wolf-Rainer] Helmholtz Ctr Infect Res, D-38124 Braunschweig, Germany

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Menyailo, O.V.; Abraham, W.R.; Conrad, R...

[Text] / O. V. Menyailo // Russ. J. Ecol. - 2008. - Vol. 39, Is. 1. - P21-25, DOI 10.1134/S1067413608010049. - Cited References: 10 . - 5. - ISSN 1067-4136РУБ Ecology

Аннотация: The effect of afforestation on the activity of microbiological mineralization of soil organic matter has been studied in Siberia. The results show that this effect concerns mainly net nitrogen mineralization and net nitrification, while carbon mineralization (CO2 formation) does not depend on the type of ecosystem. It is proposed to use the rates of net nitrogen mineralization and nitrification as the most sensitive indicators of changes in an ecosystem.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Menyailo, O.V.

[Text] / O. V. Menyailo, Y. N. Krasnoshchekov // Biol. Bull. - 2003. - Vol. 30, Is. 3. - P299-303, DOI 10.1023/A:1023872215777. - Cited References: 20 . - 5. - ISSN 1062-3590РУБ Biology

Аннотация: To estimate the probable contribution of northern forest soils to the global budget of greenhouse microgases. the cryogenic soils along the Yenisei meridian have been studied with respect to their potential denitrification and carbon mineralization activities. It is shown that the forest soils of the boreal zone have a high denitrification potential and, under conditions of a high nitrate nitrogen content, may be a source of nitrous c oxide emission. A significant correlation is observed between N2O and CO2 emissions (r = 0.85, p 0.001).

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Держатели документа:
Russian Acad Sci, Sukachev Inst Forestry, Siberian Div, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Menyailo, O.V.; Krasnoshchekov, Y.N.

[Text] / O. V. Menyailo, Y. N. Krasnoshchekov // Eurasian Soil Sci. - 2001. - Vol. 34, Is. 4. - P416-423. - Cited References: 19 . - 8. - ISSN 1064-2293РУБ Soil Science

Аннотация: The dependence of carbon mineralization and denitrification on soil chemical properties was studied in order to determine the spatial variability of these processes. Multiple regression models that describe 57% of the variation in denitrification and 97% of the variation in the organic carbon mineralization were developed. It was found that the simulation of potential denitrification activity is a more difficult problem than the simulation of C mineralization. Application of the orthogonal regression method proved that the fluxes of CO2 and N2O depend on the content of exchangeable cations in the soil (12-17% of the variability); the effect of soil acidity and the organic matter content is shown to be more significant (74-75% of the variability).

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Держатели документа:
Russian Acad Sci, Sukachev Inst Forestry, Siberian Div, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Menyailo, O.V.; Krasnoshchekov, Y.N.

[Text] / O. V. Menyailo // Eurasian Soil Sci. - 2009. - Vol. 42, Is. 10. - P1156-1162, DOI 10.1134/S106422930910010X. - Cited References: 23. - This work was supported in part by the Marie Curie Action-International Incoming Fellowships (EU 7th Framework Program) and the Alexander von Humboldt Foundation (A. von Humboldt Stiftung, Germany). . - 7. - ISSN 1064-2293РУБ Soil Science

Аннотация: The mineralization of organic matter in the soils under the six main Siberian forest-forming species was studied. The nitrogen mineralization and nitrification were the most affected by the different tree species. The rate of the CO(2) formation was similar in the soils under the different tree species. The factors affecting the variation of the data characterizing the microbiological processes were revealed. The nitrogen mineralization and nitrification correlated with the contents of the soil carbon, nitrogen, and NH (4) (+) and the soil acidity, while the carbon mineralization correlated only with the NH (4) (+) concentration and the C/N ratio.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Sukachev Inst Forestry, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Menyailo, O.V.; Marie Curie Action-International Incoming Fellowships; Alexander von Humboldt Foundation

[Text] / O. V. Menyailo, B. A. Hungate ; ed.: D Binkley, Binkley, // NATO Sci. Series IV Earth Environ. Sciences : SPRINGER, 2005. - Vol. 55: NATO Advanced Research Workshop on Trees and Soil Interactions, Implications to Global Climate Change (AUG, 2004, Krasnoyarsk, RUSSIA). - P293-305. - Cited References: 23 . - 13. - ISBN 1568-1238. - ISBN 1-4020-3445-8РУБ Forestry + Geosciences, Multidisciplinary + Soil Science

Аннотация: Changes in tree species composition could affect how forests produce and consume greenhouse gases, because the soil microorganisms that carry out these biogeochemical transformations are often sensitive to plant characteristics. We examined the effects of thirty years of stand development under six tree species in Siberian forests (Scots pine, spruce, arolla pine, larch, aspen and birch) on potential rates Of Soil CO2 production, N2O reduction and N2O production during denitrification, and CH4 oxidation. Because many of these activities relate to soil N turnover, we also measured net nitrification and N mineralization. Overall, the effects of tree species were more pronounced on N2O and CH4 fluxes than on CO2 production. Tree species altered substrate-induced respiration (SIR) and basal respiration, but the differences were not as large as those observed for N transformations. Tree species caused similar effects on denitrification potential, net N mineralization, and net nitrification, but effects on N2O reduction were idiosyncratic, resulting in a decoupling of N2O production and reduction. CH4 oxidation was affected by tree species, but these effects depended on soil moisture: increasing soil moisture enhanced CH4 oxidation under some tree species but decreased it under others. If global warming causes deciduous species to replace coniferous species, our results suggest that Siberian forests would support soil microbial communities with enhanced potential to consume CH4 but also to produce more N2O. Future predictions of CH4 uptake and N2O efflux in boreal and temperate forests need to consider changes in tree species composition together with changes in soil moisture regimes.

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SB RAS, Inst Forest, Krasnoyarsk 660036, Russia

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Menyailo, O.V.; Hungate, B.A.; Binkley, D \ed.\; Binkley, \ed.\

[Text] / O. V. Menyailo [et al.] // Biol. Fertil. Soils. - 2003. - Vol. 38, Is. 1. - P1-9, DOI 10.1007/s00374-003-0631-4. - Cited References: 23 . - 9. - ISSN 0178-2762РУБ Soil Science

Аннотация: Little information is available about the factors controlling soil C and N transformations in natural tropical forests and tree-based cropping systems. The aim of this work was to study the effects of single trees on soil microbiological activities from plantations of timber and non-timber species as well as species of primary and secondary forests in the Central Amazon. Soil samples were taken in the primary forest under Oenocarpus bacaba and Eschweilera spp., in secondary regrowth with Vismia spp., under two non-timber tree species (Bixa orellana L. and Theobroma grandiflorum Willd.), and two species planted for wood production (Carapa guianensis Aubl. and Ceiba pentandra). In these soils, net N mineralization, net nitrification, denitrification potential, basal and substrate-induced respiration rates were studied under standardized soil moisture and temperature conditions. Individual tree species more strongly affected N transformations, particularly net nitrification, than C respiration. Our results suggest that soil C respiration can be affected by tree species if inorganic N becomes a limiting factor. We found a strong correlation among almost all microbiological processes suggesting close inter-relationship between C and N transformations in the studied soils. Correlation analysis between soil chemical properties and microbiological activities suggest that such strong inter-relationships are likely due to competition between the denitrifying and C-mineralizing communities for NO3-, which might be an important N source for the microbial population in the studied soils.

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Держатели документа:
Russian Acad Sci, Inst Forest, Siberain Branch, Krasnoyarsk 660036, Russia
Univ Bayreuth, Inst Soil Sci & Soil Geog, D-95447 Bayreuth, Germany
EMBRAPA, BR-69011970 Manaus, Amazonas, Brazil

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Menyailo, O.V.; Lehmann, J...; Cravo, M.D.; Zech, W...

[Text] / O. V. Menyailo, B. A. Hungate, W. . Zech // Plant Soil. - 2002. - Vol. 242, Is. 2. - P183-196, DOI 10.1023/A:1016245619357. - Cited References: 29 . - 14. - ISSN 0032-079XРУБ Agronomy + Plant Sciences + Soil Science

Аннотация: The effects of grassland conversion to forest vegetation and of individual tree species on microbial activity in Siberia are largely unstudied. Here, we examined the effects of the six most commonly dominant tree species in Siberian forests (Scots pine, spruce, Arolla pine, larch, aspen and birch) on soil C and N mineralization, N2O-reduction and N2O production during denitrification 30 years after planting. We also documented the effect of grassland conversion to different tree species on microbial activities at different soil depths and their relationships to soil chemical properties. The effects of tree species and grassland conversion were more pronounced on N than on C transformations. Tree species and grassland conversion did significantly alter substrate-induced respiration (SIR) and basal respiration, but the differences were not as large as those observed for N transformations. Variances in SIR and basal respiration within species were markedly lower than those in N transformations. Net N mineralization, net nitrification, and denitrification potential were highest under Arolla pine and larch, intermediate under deciduous aspen and birch, and lowest beneath spruce and Scots pine. Tree species caused similar effects on denitrification potential, net N mineralization, and net nitrification, but effects on N2O reduction rate were idiosyncratic, indicating a decoupling of N2O production and reduction. We predict that deciduous species should produce more N2O in the field than conifers, and that Siberian forests will produce more N2O if global climate change alters tree species composition. Basal respiration and SIR showed inverse responses to tree species: when basal respiration increased in response to a given tree species, SIR declined. SIR may have been controlled by NH4+ availability and related therefore to N mineralization, which was negatively affected by grassland conversion. Basal respiration appeared to be less limited by NH4+ and controlled mostly by readily available organic C (DOC), which was higher in concentration under forests than in grassland and therefore basal respiration was higher in forested soils. We conclude that in the Siberian artificial afforestation experiment, soil C mineralization was not limited by N.

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Inst Forest SB RAS, Krasnoyarsk 660036, Russia
No Arizona Univ, Dept Sci Biol, Flagstaff, AZ 86001 USA
No Arizona Univ, Merriam Powell Ctr Environm Res, Flagstaff, AZ 86001 USA
Univ Bayreuth, Inst Soil Sci & Soil Geog, D-95447 Bayreuth, Germany

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Menyailo, O.V.; Hungate, B.A.; Zech, W...

[Text] / O. V. Menyailo, B. . Huwe // J. Plant Nutr. Soil Sci. - 1999. - Vol. 162, Is. 5. - P527-531, DOI 10.1002/(SICI)1522-2624(199910)162:5527::AID-JPLN5273.3.CO;2-R. - Cited References: 14 . - 5. - ISSN 1436-8730РУБ Agronomy + Plant Sciences + Soil Science

Аннотация: The influence of temperature (T) and water potential (psi) on the denitrification potential, C and N mineralization and nitrification were studied in organic and mineral horizons of an acid spruce forest soil. The amount of N2O emitted from organic soil was 10 times larger than from the mineral one. The maximum of N2O emission was in both soils at the highest water potential 0 MPa and at 20 degrees C. CO2 production in the organic soil was 2 times higher than in mineral soil. Net ammonification in organic soil was negative for most of the T-psi variations, while in mineral soil it was positive. Net nitrification in organic soil was negative only at the maximum water potential and temperature (0 MPa, 28 degrees C). The highest rate was between 0 and -0.3 MPa and between 20 and 28 degrees C. In mineral soil NO3- accumulated at all T-psi variations with a maximum at 20 degrees C and -0.3 MPa. We concluded that in organic soil the immobilization of NH4+ is the dominant process in the N-cycling. Nevertheless, decreasing of total N mineralized at 0 MPa and 20-28 degrees C can be explained by denitrification.

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Держатели документа:
Univ Bayreuth, Dept Soil Phys, D-95440 Bayreuth, Germany
RAS, SB, Inst Forest, Krasnoyarsk 660036, Russia

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Menyailo, O.V.; Huwe, B...

[Text] / O. V. Menyailo, B. A. Hungate // Glob. Biogeochem. Cycle. - 2006. - Vol. 20, Is. 3. - Ст. GB3025, DOI 10.1029/2005GB002527. - Cited References: 47 . - 10. - ISSN 0886-6236РУБ Environmental Sciences + Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences

Аннотация: Measuring the stable isotope composition of nitrous oxide ( N(2)O) evolved from soil could improve our understanding of the relative contributions of the main microbial processes ( nitrification and denitrification) responsible for N(2)O formation in soil. However, interpretation of the isotopic data in N(2)O is complicated by the lack of knowledge of fractionation parameters by different microbial processes responsible for N(2)O production and consumption. Here we report isotopic enrichment for both nitrogen and oxygen isotopes in two stages of denitrification, N(2)O production and N(2)O reduction. We found that during both N(2)O production and reduction, enrichments were higher for oxygen than nitrogen. For both elements, enrichments were larger for N(2)O production stage than for N(2)O reduction. During gross N(2)O production, the ratio of delta(18)O- to-delta(15)N differed between soils, ranging from 1.6 to 2.7. By contrast, during N(2)O reduction, we observed a constant ratio of delta(18)O- to-delta(15)N with a value near 2.5. If general, this ratio could be used to estimate the proportion of N(2)O being reduced in the soil before escaping into the atmosphere. Because N(2)O- reductase enriches N(2)O in both isotopes, the global reduction of N(2)O consumption by soil may contribute to the globally observed isotopic depletion of atmospheric N(2)O.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Forest, Krasnoyarsk 660036, Russia
No Arizona Univ, Dept Biol Sci, Flagstaff, AZ 86011 USA
No Arizona Univ, Merriam Powell Ctr Environm Res, Flagstaff, AZ 86011 USA

Доп.точки доступа:
Menyailo, O.V.; Hungate, B.A.

[Text] / O. V. Menyailo, B. A. Hungate // J. Geophys. Res.-Biogeosci. - 2006. - Vol. 111, Is. G2. - Ст. G02022, DOI 10.1029/2005JG000058. - Cited References: 36 . - 8. - ISSN 0148-0227РУБ Environmental Sciences + Geosciences, Multidisciplinary

Аннотация: Nitrous oxide (N2O) is an important greenhouse gas and participates in the destruction of stratospheric ozone. Soil bacteria produce N2O through denitrification and nitrification, but these processes differ radically in substrate requirements and responses to the environment. Understanding the controls over N2O efflux from soils, and how N2O emissions may change with climate warming and altered precipitation, require quantifying the relative contributions from these groups of soil bacteria to the total N2O flux. Here we used ammonium nitrate (NH4NO3, including substrates for both processes) in which the nitrate has been enriched in the stable isotope of oxygen, O-18, to partition microbial sources of N2O, arguing that a molecule of N2O carrying the O-18 labeled will have been produced by denitrification. We compared the influences of six common tree species on the relative contributions of nitrification and denitrification to N2O flux from soils, using soils from the Siberian afforestation experiment. We also altered soil water content, to test whether denitrification becomes a dominant source of N2O when soil water content increases. Tree species altered the proportion of nitrifier and denitrifier-derived N2O. Wetter soils produced more N2O from denitrification, though the magnitude of this effect varied among tree species. This indicates that the roles of denitrification and nitrification vary with tree species, and, that tree species influence soil responses to increased water content.

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Держатели документа:
Russian Acad Sci, SB RAS, Inst Forest, Krasnoyarsk, Russia
No Arizona Univ, Dept Biol Sci, Flagstaff, AZ 86011 USA
No Arizona Univ, Merriam Powell Ctr Environm Res, Flagstaff, AZ 86011 USA

Доп.точки доступа:
Menyailo, O.V.; Hungate, B.A.

/ O. V. Menyailo [et al.] // Isotopes in Environmental and Health Studies. - 2003. - Vol. 39, Is. 1. - P41-52, DOI 10.1080/1025601031000096745 . - ISSN 1025-6016
Аннотация: The use of stable isotopes of N and O in N2O has been proposed as a way to better constrain the global budget of atmospheric N2O and to better understand the relative contributions of the main microbial processes (nitrification and denitrification) responsible for N2O formation in soil. This study compared the isotopic composition of N2O emitted from soils under different tree species in the Brazilian Amazon. We also compared the effect of tree species with that of soil moisture, as we expected the latter to be the main factor regulating the proportion of nitrifier- and denitrifier, derived N2O and, consequently, isotopic signatures of N2O. Tree species significantly affected ?15N in nitrous oxide. However, there was no evidence that the observed variation in ?15N in N2O was determined by varying proportions of nitrifier- vs. denitrifier-derived N2O. We submit that the large variation in ?15N-N2O is the result of competition between denitrifying and immobilizing microorganisms for NO-3. In addition to altering ?15N-N2O, tree species affected net rates of N2O emission from soil in laboratory incubations. These results suggest that tree species contribute to the large isotopic variation in N2O observed in a range tropical forest soils. We found that soil water affects both 15N and 18O in N2O, with wetter soils leading to more depleted N2O in both 15N and 18O. This is likely caused by a shift in biological processes for 15N and possible direct exchange of 18O between H2O and N2O.

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Institute of Forest SB RAS, Krasnoyarsk, Russian Federation
Department of Biological Sciences, Merriam-Powell Ctr. for Environ.Res., Northern Arizona University, Flagstaff, United States
Department of Soil Sci./Soil Geogr., University of Bayreuth, Bayreuth, Germany
Department of Plant Ecology, University of Bayreuth, Bayreuth, Germany

Доп.точки доступа:
Menyailo, O.V.; Hungate, B.A.; Lehmann, J.; Gebauer, G.; Zech, W.

/ B. Wild [et al.] // Soil Biology and Biochemistry. - 2013. - Vol. 67. - P85-93, DOI 10.1016/j.soilbio.2013.08.004 . - ISSN 0038-0717
Аннотация: Turbic Cryosols (permafrost soils characterized by cryoturbation, i.e., by mixing of soil layers due to freezing and thawing) are widespread across the Arctic, and contain large amounts of poorly decomposed organic material buried in the subsoil. This cryoturbated organic matter exhibits retarded decomposition compared to organic material in the topsoil. Since soil organic matter (SOM) decomposition is known to be tightly linked to N availability, we investigated N transformation rates in different soil horizons of three tundra sites in north-eastern Siberia and Greenland. We measured gross rates of protein depolymerization, N mineralization (ammonification) and nitrification, as well as microbial uptake of amino acids and NH4 + using an array of 15N pool dilution approaches. We found that all sites and horizons were characterized by low N availability, as indicated by low N mineralization compared to protein depolymerization rates (with gross N mineralization accounting on average for 14% of gross protein depolymerization). The proportion of organic N mineralized was significantly higher at the Greenland than at the Siberian sites, suggesting differences in N limitation. The proportion of organic N mineralized, however, did not differ significantly between soil horizons, pointing to a similar N demand of the microbial community of each horizon. In contrast, absolute N transformation rates were significantly lower in cryoturbated than in organic horizons, with cryoturbated horizons reaching not more than 32% of the transformation rates in organic horizons. Our results thus indicate a deceleration of the entire N cycle in cryoturbated soil horizons, especially strongly reduced rates of protein depolymerization (16% of organic horizons) which is considered the rate-limiting step in soil N cycling. В© 2013 The Authors.

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University of Vienna, Department of Microbiology and Ecosystem Science, Division of Terrestrial Ecosystem Research, Althanstrasse 14, 1090 Vienna, Austria
Austrian Polar Research Institute, 1090 Vienna, Austria
University of South Bohemia, Department of Ecosystems Biology, Branisovska 31, 37005 Ceske Budejovice, Czech Republic
Leibniz Universitat Hannover, Institut fur Bodenkunde, Herrenhauser Strasse 2, 30419 Hannover, Germany
International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, 2361 Laxenburg, Austria
Central Siberian Botanical Garden, Siberian Branch of Russian Academy of Sciences, St. Zolotodolinskaya 101, 630090 Novosibirsk, Russian Federation
VN Sukachev Institute of Forest, Siberian Branch of Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
University of Vienna, Department of Ecogenomics and Systems Biology, Althanstrasse 14, 1090 Vienna, Austria
University of Bergen, Department of Biology/Centre for Geobiology, Allegaten 41, 5007 Bergen, Norway
Northeast Scientific Station, Pacific Institute for Geography, Far-East Branch of Russian Academy of Sciences, 678830 Chersky, Republic of Sakha, Russian Federation

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Wild, B.; Schnecker, J.; Barta, J.; Capek, P.; Guggenberger, G.; Hofhansl, F.; Kaiser, C.; Lashchinsky, N.; Mikutta, R.; Mooshammer, M.; Santruckova, H.; Shibistova, O.; Urich, T.; Zimov, S.A.; Richter, A.

/ M. I. Makarov [et al.] // Russ. J. Ecol. - 2015. - Vol. 46, Is. 4. - P317-324, DOI 10.1134/S1067413615040116 . - ISSN 1067-4136
Аннотация: Freezing-thawing of alpine meadow soils results in a 1.5- to 2-fold increase in the contents of extractable organic and inorganic nitrogen and organic carbon compounds, whereas the contents of microbial biomass nitrogen and carbon slightly decrease. The latter are quickly restored in the course of subsequent incubation, but the processes of transformation of nitrogen compounds proceed differently in soils that are subject to freezing under natural conditions and in nonfreezing soils. In nonfreezing soil, an abrupt activation of organic nitrogen mineralization and nitrification takes place against the background of a relatively low level of microbial assimilation of inorganic nitrogen compounds by microorganisms. © 2015, Pleiades Publishing, Ltd.

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Держатели документа:
Moscow State University, Moscow, Russian Federation
Sukachev Institute of Forest, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russian Federation

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Makarov, M.I.; Malysheva, T.I.; Mulyukova, O.S.; Menyailo, O.V.

/ M. I. Makarov, T. I. Malysheva, O. V. Menyailo // Eurasian Soil Sci. - 2019. - Vol. 52, Is. 9. - P1028-1037, DOI 10.1134/S1064229319090059. - Cited References:48. - This study was supported by the Russian Science Foundation, project no. 16-14-10208. . - ISSN 1064-2293. - ISSN 1556-195XРУБ Soil Science

Аннотация: Isotopic composition of nitrogen in soils can be an informative indicator of N transformation processes and sources of N nutrition of plants, but data on d15N of labile N compounds are scarce. It is shown that N transformation in meadow-alpine soils (Leptic Umbrisols) of the northwestern Caucasus (Teberda Reserve, Karachay-Cherkess Republic) leads to well-expressed differences in isotopic signatures of different N compounds: d15N of extractable organic matter > d15Ntotal > d15N-> d15N-The range of d15N in this sequence reaches 25%. Differences in d15N within the same pool of N in soils of different alpine ecosystems, as well as seasonal dynamics of d15N-are much less pronounced (the range of d15N is 2-4%). The values of d15Ntotal and d15N-positively correlate with N mineralization and nitrification and demonstrate the accumulation of heavy N isotope in soils of the alpine ecosystems with more active N transformation processes. Obviously, nitrification is the key process controlling the isotopic signature of NThe role of N mineralization in the fractionation of N isotopes is less obvious, and 15N accumulation in the extractable organic matter can be related to the significant content of "heavy" microbial N in extractable organic N pool.

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Держатели документа:
Lomonosov Moscow State Univ, Moscow 119991, Russia.
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Makarov, M., I; Malysheva, T., I; Menyailo, O., V; Russian Science FoundationRussian Science Foundation (RSF) [16-14-10208]