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

[Text] / S. R. Loskutov // Holzforschung. - 2000. - Vol. 54, Is. 3. - P301-304, DOI 10.1515/HF.2000.050. - Cited References: 11 . - 4. - ISSN 0018-3830РУБ Forestry + Materials Science, Paper & Wood

Аннотация: Dubinin's theory of micropore volume filling was used to describe the isotherms of water resorption and desorption by natural wood of twelve species and chemically modified birch wood. The analysis showed that each wood sample is characterized by its own pair of the main equation parameters. The correlation between these parameters was also determined. The resorption/desorption characteristic which is a combination of the main equation parameters of the above mentioned theory was revealed to be invariable for all the studied examples of natural wood. It can be used for estimation of wood substance disturbances caused by chemical modification and probably anthropogenic factors effecting during wood formation. The thermal coefficient as a function of relative vapor pressure was found. This dependence and the main equation of the theory of micropore volume filling can be used to calculate sorption equilibrium for wood/water system under the limited set of experimental data.

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Держатели документа:
RAS, VN Sukachev Inst Forest, Krasnoyarsk, Russia

Доп.точки доступа:
Loskutov, S.R.

[Text] / J. . Viers [et al.] // Biogeochemistry. - 2013. - Vol. 113, Is. 01.03.2013. - P435-449, DOI 10.1007/s10533-012-9770-8. - Cited References: 72. - We would like to thank the Ministere de l'Educational Nationale et de la Recherche, le Ministere des Affaires Etrabngers et l'INSU/CNRS (through the EC2CO program) of France for supporting this work. . - 15. - ISSN 0168-2563РУБ Environmental Sciences + Geosciences, Multidisciplinary

Аннотация: We measured the seasonal dynamics of major and trace elements concentrations in foliage of larch, main conifer species of Siberia, and we analyzed cryogenic soils collected in typical permafrost-dominated habitats in the Central Siberia. This region offers a unique opportunity to study element fractionation between the soil and the plant because of (i) the homogeneous geological substratum, (ii) the monospecific stands (Larix gmelinii) and (iii) the contrasted habitats (North-facing slope, South-facing slope, and Sphagnum peatbog) in terms of soil temperature, moisture, thickness of the active layer, tree biomass and rooting depth. The variation of these parameters from one habitat to the other allowed us to test the effects of these parameters on the element concentration in larch foliage considered with high seasonal resolution. Statistical treatment of data on larch needles collected 4 times in 3 locations during entire growing season (June-September) demonstrated that : (1) there is a high similarity of foliar chemical composition of larch trees in various habitats suggesting intrinsically similar requirements of larch tree growth for nutrients, (2) the variation of elemental concentrations in larch needles is controlled by the period (within the growing season) and not by the geographical location (South-facing slope, North-facing slope or bog zone) and (3) there are three groups of elements according to their patterns of elements concentration in needles over the growing season from June to September can be identified: (1): nutrient elements [P, Cu, Rb, K, B, Na, Zn, Ni and Cd] showing a decrease of concentration from June to September similar to the behaviour of major nutrients such as N, P and K; (2): accumulating elements [Ca, Mg, Mo, Co, Sr, Mn, Pb and Cr] showing an increase of concentration from June-July to September; (3): indifferent elements [Al, Zr, Fe, Ba, Ti, REEs (Pr, Nd, Ce, La, Gd, Er, Dy, Tb, Lu, Yb, Tm, Sm, Ho, Eu), Y, Th and U] showing a decrease of concentration from June to July and then an increase of concentration to September. A number of micronutrients (e.g., Cu, Zn) demonstrate significant resorption at the end of growing season suggesting possible limitation by these elements. Although the intrinsic requirement seems to be similar among habitats, the total amount of element stored within the different habitats is drastically different due to the differences in standing tree biomass. The partitioning coefficients between soil and larch appear to be among the lowest compared to other environments with variable plants, soils and climates. Applying the "space for time" substitution scenario, it follows that under ongoing climate warming there will be an increase of the element stock following enhanced above-ground biomass accumulation, even considering zero modification of element ratios and their relative mobility. In this sense, the habitats like south-facing slopes can serve as resultant of climate warming effect on element cycling in larch ecosystems for the larger territory of Central Siberia.

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Держатели документа:
[Viers, J.
Pokrovsky, O. S.
Auda, Y.
Beaulieu, E.
Zouiten, C.
Oliva, P.
Dupre, B.] Univ Toulouse 3, CNRS, IRD, GET OMP, F-31400 Toulouse, France
[Prokushkin, A. S.
Kirdyanov, A. V.] Sukachev Inst Forestry SB RAS, Krasnoyarsk 660036, Russia
[Pokrovsky, O. S.] UroRAS, Inst Ecol Problems North, Arkhangelsk, Russia

Доп.точки доступа:
Viers, J.; Prokushkin, Anatoly S.; Прокушкин, Анатолий Станиславович; Pokrovsky, O.S.; Auda, Y.; Kirdyanov, Alexander V.; Кирдянов, Александр Викторович; Beaulieu, E.; Zouiten, C.; Oliva, P.; Dupre, B.; Ministere de l'Educational Nationale et de la Recherche; le Ministere des Affaires Etrabngers; l'INSU/CNRS of France

/ A. S. Prokushkin [et al.] // Forests. - 2018. - Vol. 9, Is. 6, DOI 10.3390/f9060314 . - ISSN 1999-4907
Аннотация: Permafrost exerts strong controls on forest development through nutrient availability. The key question of this study was to assess the effect of site conditions on macroelement concentration and stable isotope (?13C and ?15N) dynamics during the growing season, and nutrient stoichiometry and resorption efficiency in the foliage of two common larch species in Siberia. Foliar nutrient (N, P and K) concentrations of larches grown on permafrost soils were exceptionally high in juvenile needles compared to those from a permafrost-free region (+50% and 130% for P and K), but were two-fold lower at needle maturation. Within permafrost terrain trees, sites with a warmer and deeper soil active layer had 15-60% greater nutrient concentrations and higher ?15N in their needles compared to shallower, colder soils. Larch of permafrost-free sites demonstrated an enrichment of foliage in 15N (+1.4% to +2.4h) in comparison to permafrost terrain (-2.0% to -6.9h). At all sites, foliar ?13C decreased from June to August, which very likely results from an increasing contribution of current photoassimilates to build foliar biomass. With senescence, nutrient concentrations in larch needles decreased significantly by 60-90%. This strong ability of larch to retain nutrients through resorption is the essential mechanism that maintains tree growth early in the growing season when soil remains frozen. The high resorptive efficiency found for K and P for larches established on permafrost suggests nutrient limitation of tree growth within the Central Siberian Plateau not only by N, as previously reported, but also by P and K. The increasing nutrient concentrations and a 15N enrichment of foliage towards warmer sites was paralleled by an up to 50-fold increase in biomass production, strongly suggesting that accelerated nutrient cycling with permafrost degradation contributes to an increased productivity of Siberian larch forests. © 2018 by the authors.

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Держатели документа:
V.N. Sukachev Institute of Forest SB RAS, Akademgorodok 50/28, Krasnoyarsk, Russian Federation
WSL, Zurcherstrasse 111, Birmensdorf, Switzerland
GET, Universite Paul Sabatier-CNRS-IRD, 14 Avenue Edouard Belin, Toulouse, France
Siberian Federal University, Svobodny 79, Krasnoyarsk, Russian Federation
Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States

Доп.точки доступа:
Prokushkin, A. S.; Hagedorn, F.; Pokrovsky, O. S.; Viers, J.; Kirdyanov, A. V.; Masyagina, O. V.; Prokushkina, M. P.; McDowell, W. H.