/ N.M Tchebakova, E.I. Parfenova // The role of boreal forests and forestry in the global carbon budget: Proc. of IBFRA 2000 Conference May 8-12, 2000, Edmonton, Alberta, Canada. - Edmonton : Canadian Forest Service, 2002. - С. 217-226
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Parfenova, Elena Ivanovna; Парфенова, Елена Ивановна; Чебакова, Надежда Михайловна
Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН
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Найдено документов в текущей БД: 48
Carbon and water exchanges of regenerating forests in central Siberia
/ M. Meroni, N. Tchebakova // Forest Ecology and Management. - 2002. - Vol. 169, № 1-2. - С. 115-122
Аннотация: Direct measurements of CO2 and water vapour of regenerating forests after fire events (secondary succession stages) are needed to determine the role of such disturbances in the biome carbon and water cycles functioning. An estimation of the extension of burnt areas is also required in order to quantify NBP (net biome productivity), a variable that includes large-scale carbon losses (such as fire) bypassing heterotrophic respiration. Hence, eddy covariance measurements Of CO2 and water vapour were carried out in a natural regenerating forest after a fire event. Measurements were collected continuously over a Betula spp. stand in central Siberia during summer 1999. Minimum carbon exchange rate (NEE, net ecosystem exchange) exceeded -30 mumol m(-2) s(-1) (net flux negative indicating CO2 uptake by vegetation) and the partitioning of the available energy was mostly dominated by latent heat flux. Structure, age and composition of the forest were analysed to understand the secondary succession stages. The results were compared with previous studies on coniferous forests where biospheric exchanges of energy were dominated by sensible heat fluxes and small carbon uptake rates, thus indicating rather limiting growing conditions. A classification of a Landsat-4 Thematic Mapper scene has been carried out to determine the magnitude of burnt areas and the extension of broadleaf regenerating forests. Analysis of burnt areas spatial frequency and carbon exchanges of the regenerating forest stress the importance of considering large area disturbances for full carbon accounting. (C) 2002 Elsevier Science B.V. All rights reserved.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Div, Sukachev Isnt Forestry, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Meroni, M. ; Мерони М.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна
Аннотация: Direct measurements of CO2 and water vapour of regenerating forests after fire events (secondary succession stages) are needed to determine the role of such disturbances in the biome carbon and water cycles functioning. An estimation of the extension of burnt areas is also required in order to quantify NBP (net biome productivity), a variable that includes large-scale carbon losses (such as fire) bypassing heterotrophic respiration. Hence, eddy covariance measurements Of CO2 and water vapour were carried out in a natural regenerating forest after a fire event. Measurements were collected continuously over a Betula spp. stand in central Siberia during summer 1999. Minimum carbon exchange rate (NEE, net ecosystem exchange) exceeded -30 mumol m(-2) s(-1) (net flux negative indicating CO2 uptake by vegetation) and the partitioning of the available energy was mostly dominated by latent heat flux. Structure, age and composition of the forest were analysed to understand the secondary succession stages. The results were compared with previous studies on coniferous forests where biospheric exchanges of energy were dominated by sensible heat fluxes and small carbon uptake rates, thus indicating rather limiting growing conditions. A classification of a Landsat-4 Thematic Mapper scene has been carried out to determine the magnitude of burnt areas and the extension of broadleaf regenerating forests. Analysis of burnt areas spatial frequency and carbon exchanges of the regenerating forest stress the importance of considering large area disturbances for full carbon accounting. (C) 2002 Elsevier Science B.V. All rights reserved.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Div, Sukachev Isnt Forestry, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Meroni, M. ; Мерони М.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна
Eurosiberian Transect: an introduction to the experimental region
/ E. -D. Schulze, N. N. Vygodskaya, N. M. Tchebakova, E. I. Parfenova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 421-428
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Vygodskaya, N.N.; Выгодская Н.Н.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Parfenova, Elena Ivanovna; Парфенова, Елена Ивановна; Шульце Е-Д
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Vygodskaya, N.N.; Выгодская Н.Н.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Parfenova, Elena Ivanovna; Парфенова, Елена Ивановна; Шульце Е-Д
Climatic control of stand thinning in unmanaged spruce forests of the southern taiga in European Russia
/ N.N. Vygodskaya, E.-D. Schulze, N.M. Tchebakova et al // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 443-461
Аннотация: The demography of Picea abies trees was studied over a period of about 30 yr on permanent plots in six forest types of an unmanaged forest located in a forest reserve of the Southern Taiga, NW of Moscow. This study encompassed a broad range of conditions that are typical for old growth spruce forests in the boreal region, including sites with a high water table and well drained sites, podzolic soils, acidic soils and organic soils. At all sites stand density, tree height, breast height diameter and age has been periodically recorded since 1968. Tree density ranged between 178 and 1035 trees ha(-1) for spruce and between 232 and 1168 trees ha-1 for the whole stand, including mainly Betula and Populus. Biomass ranged between 5.4 and 170 t(dw) ha(-1) for spruce and between 33 to 198 td, ha(-1) for the whole stand. Averaged over a long period of time, biomass did not change with stand density according to the self-thinning rule. in fact, on most sites biomass remained almost constant in the long term, while stand density decreased. The study demonstrates that the loss of living trees was not regulated by competitive interactions between trees, but by disturbances caused by climatic events. Dry years caused losses of minor and younger trees without affecting biomass. In contrast, periodic storms resulted in a loss of biomass without affecting density, except for extreme events, where the whole stand may fall. Dry years followed by wet years enhance the effect on stand density. Since mainly younger trees were lost, the apparent average age of the stand increased more than real time (20% for Picea). Average mortality was 2.8 +/- 0.5% yr(-1) for spruce. Thus, the forest is turned over once every 160-180 yr by disturbances. The demography of dead trees shows that the rate of decay depends on the way the tree died. Storm causes uprooting and stem breakage, where living trees fall to the forest floor and decay with a mean residence time (t(1/2)) of about 16 yr (decomposition rate constant k(d) = 0.042 yr(-1)). This contrasts with trees that die by drought or insect damage, and which remain as standing dead trees with a mean residence time of 3-13 yr until they are brought to ground, mainly by wind. These standing dead trees require an additional mean residence time of about 22 yr for decay on the ground (k(d) = 0.031). In conclusion, we demonstrate that, rather than competitive interactions, it is climate extremes, namely drought, rapid changes of dry years followed by wet years, and storm that determine stand structure, biomass and density, which then affect the net exchange with the atmosphere. The climatic effects are difficult to predict, because the sensitivity of a stand to climate extremes depends on the past history. This may range from no effect, if the stand was recovering from an earlier drought and exhibited a relatively low density, to a total collapse of canopies, if drought reduces stand density to an extent that other climatic extremes (especially wind) may cause further damage.
WOS
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Schulze, E.-D.; Шульце Е-Д; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Выгодская Н.Н.
Аннотация: The demography of Picea abies trees was studied over a period of about 30 yr on permanent plots in six forest types of an unmanaged forest located in a forest reserve of the Southern Taiga, NW of Moscow. This study encompassed a broad range of conditions that are typical for old growth spruce forests in the boreal region, including sites with a high water table and well drained sites, podzolic soils, acidic soils and organic soils. At all sites stand density, tree height, breast height diameter and age has been periodically recorded since 1968. Tree density ranged between 178 and 1035 trees ha(-1) for spruce and between 232 and 1168 trees ha-1 for the whole stand, including mainly Betula and Populus. Biomass ranged between 5.4 and 170 t(dw) ha(-1) for spruce and between 33 to 198 td, ha(-1) for the whole stand. Averaged over a long period of time, biomass did not change with stand density according to the self-thinning rule. in fact, on most sites biomass remained almost constant in the long term, while stand density decreased. The study demonstrates that the loss of living trees was not regulated by competitive interactions between trees, but by disturbances caused by climatic events. Dry years caused losses of minor and younger trees without affecting biomass. In contrast, periodic storms resulted in a loss of biomass without affecting density, except for extreme events, where the whole stand may fall. Dry years followed by wet years enhance the effect on stand density. Since mainly younger trees were lost, the apparent average age of the stand increased more than real time (20% for Picea). Average mortality was 2.8 +/- 0.5% yr(-1) for spruce. Thus, the forest is turned over once every 160-180 yr by disturbances. The demography of dead trees shows that the rate of decay depends on the way the tree died. Storm causes uprooting and stem breakage, where living trees fall to the forest floor and decay with a mean residence time (t(1/2)) of about 16 yr (decomposition rate constant k(d) = 0.042 yr(-1)). This contrasts with trees that die by drought or insect damage, and which remain as standing dead trees with a mean residence time of 3-13 yr until they are brought to ground, mainly by wind. These standing dead trees require an additional mean residence time of about 22 yr for decay on the ground (k(d) = 0.031). In conclusion, we demonstrate that, rather than competitive interactions, it is climate extremes, namely drought, rapid changes of dry years followed by wet years, and storm that determine stand structure, biomass and density, which then affect the net exchange with the atmosphere. The climatic effects are difficult to predict, because the sensitivity of a stand to climate extremes depends on the past history. This may range from no effect, if the stand was recovering from an earlier drought and exhibited a relatively low density, to a total collapse of canopies, if drought reduces stand density to an extent that other climatic extremes (especially wind) may cause further damage.
WOS
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Schulze, E.-D.; Шульце Е-Д; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Выгодская Н.Н.
Comparitive ecosystem-atmosphere exchange of energy and mass in a European Russian and a central Siberian bog I. Interseasonal and interannual variability of energy and latent heat fluxes during the snowfree period
/ J. Kurbatova, N. M. Tchebakova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 497-513
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Kurbatova, J.; Курбатова Дж.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Kurbatova, J.; Курбатова Дж.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна
Interannual and seasonal variations of energy and water vapour fluxes above a Pinus sylvestris forest in the Siberian middle taiga
/ N.M. Tchebakova et al, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 537-551
Аннотация: Long-term eddy covariance measurements of energy and water fluxes and associated climatic parameters were carried out above a Scots pine (Pinus sylvestris) forest in the middle taiga zone of Central Siberia. Data from June 1998 through October 2000 are presented. With the exception of winter 1998/1999, data collection over this period were more or less continuous. A distinct seasonality in surface energy exchange characteristics was observed in all years. In early spring in the absence of physiological activity by the vegetation, about 80% of the net radiation was partitioned for sensible heat, resulting in Bowen ratios, beta, as high as 8. In the 1-2 wk period associated with onset of photosynthesis in spring, evaporation rates increased rapidly and beta rapidly dropped. However, even during summer months, sensible heat fluxes typically exceeded latent heat fluxes and beta remained above 2.0. Observed daily evaporation rates varied between 0.5-1.0 mm d(-1) in spring and autumn and 1.5-2 mm d(-1) in midsummer. The overall average for the three growing seasons examined was 1.25 mm d(-1). Precipitation was on average 230 mm for the growing period, with evaporation over the same time being about 190 mm for both 1999 and 2000. This represented only about 35% of the equilibrium evaporation rate. There was typically a positive hydrological balance of 40 mm for the growing season as a whole. However, in all three years examined, evaporation exceeded precipitation totals by 20-40 mm in at least one calendar month during summer. During the growing season, daily averaged surface conductances varied between 0.15 and 0.20 mol m(-2) s(-1) (3-4.5 mm s(-1)) in dry or cool months and 0.30-0.35 mol m(-2) s(-1) (6.5-8 mm s(-1)) in moist and warm months. Despite a negative hydrological balance during midsummer, there was little evidence for reduced canopy conductances in response to soil water deficits. This may have been the consequence of roots accessing water from within or just above a perched water table, located at about 2 m depth.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Sukachev Inst Forest
Доп.точки доступа:
Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
Аннотация: Long-term eddy covariance measurements of energy and water fluxes and associated climatic parameters were carried out above a Scots pine (Pinus sylvestris) forest in the middle taiga zone of Central Siberia. Data from June 1998 through October 2000 are presented. With the exception of winter 1998/1999, data collection over this period were more or less continuous. A distinct seasonality in surface energy exchange characteristics was observed in all years. In early spring in the absence of physiological activity by the vegetation, about 80% of the net radiation was partitioned for sensible heat, resulting in Bowen ratios, beta, as high as 8. In the 1-2 wk period associated with onset of photosynthesis in spring, evaporation rates increased rapidly and beta rapidly dropped. However, even during summer months, sensible heat fluxes typically exceeded latent heat fluxes and beta remained above 2.0. Observed daily evaporation rates varied between 0.5-1.0 mm d(-1) in spring and autumn and 1.5-2 mm d(-1) in midsummer. The overall average for the three growing seasons examined was 1.25 mm d(-1). Precipitation was on average 230 mm for the growing period, with evaporation over the same time being about 190 mm for both 1999 and 2000. This represented only about 35% of the equilibrium evaporation rate. There was typically a positive hydrological balance of 40 mm for the growing season as a whole. However, in all three years examined, evaporation exceeded precipitation totals by 20-40 mm in at least one calendar month during summer. During the growing season, daily averaged surface conductances varied between 0.15 and 0.20 mol m(-2) s(-1) (3-4.5 mm s(-1)) in dry or cool months and 0.30-0.35 mol m(-2) s(-1) (6.5-8 mm s(-1)) in moist and warm months. Despite a negative hydrological balance during midsummer, there was little evidence for reduced canopy conductances in response to soil water deficits. This may have been the consequence of roots accessing water from within or just above a perched water table, located at about 2 m depth.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Sukachev Inst Forest
Доп.точки доступа:
Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
Three years of trace gas observations over the EuroSiberian domain derived from aircraft sampling - a concerted action
/ I. Levin, N. M. Tchebakova, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 696-712
Аннотация: A three-year trace gas climatology of CO2 and its stable isotopic ratios, as well as CH4, N2O and SF6, derived from regular vertical aircraft sampling over the Eurasian continent is presented. The four sampling sites range from about 1degreesE to 89degreesE in the latitude belt from 48N to 62degreesN. The most prominent features of the CO2 observations are an increase of the seasonal cycle amplitudes of CO2 and delta(13)C-CO2 in the free troposphere (at 3000 m a.s.l.) by more than 60% from Western Europe to Western and Central Siberia. delta(18)O-CO2 shows an even larger increase of the seasonal cycle amplitude by a factor of two from Western Europe towards the Ural mountains, which decreases again towards the most eastern site, Zotino. These data reflect a strong influence of carbon exchange fluxes with the continental biosphere. In particular, during autumn and winter delta(18)O-CO2 shows a decrease by more than 0.5parts per thousand from Orleans (Western Europe) to Syktyvkar (Ural mountains) and Zotino (West Siberia), mainly caused by soil respiration fluxes depleted in delta(18)O with respect to atmospheric CO2. CH4 mixing ratios in the free troposphere at 3000 m over Western Siberia are higher by about 20-30 ppb if compared to Western Europe. Wetland emissions seem to be particularly visible in July-September, with largest signals at Zotino in 1998. Annual mean CH4 mixing ratios decrease slightly from 1998 to 1999 at all Russian sites. In contrast to CO2 and CH4, which show significant vertical gradients between 2000 and 3000 m a.s.l., N2O mixing ratios are vertically very homogeneous and show no significant logitudinal gradient between the Ural mountains and Western Siberia, indicating insignificant emissions of this trace gas from boreal forest ecosystems in Western Siberia. The growth rate of N2O (1.2-1.3 ppb yr(-1)) and the seasonal amplitude (0:5-1.1 ppb) are similar at both aircraft sites, Syktyvkar and Zotino. For SF6 an annual increase of 5% is observed, together with a small seasonal cycle which is in phase with the N2O cycle, indicating that the seasonality of both trace gases are most probably caused by atmospheric transport processes with a possible contribution from stratosphere-troposphere exchange.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Levin, I.; Левин И.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
Аннотация: A three-year trace gas climatology of CO2 and its stable isotopic ratios, as well as CH4, N2O and SF6, derived from regular vertical aircraft sampling over the Eurasian continent is presented. The four sampling sites range from about 1degreesE to 89degreesE in the latitude belt from 48N to 62degreesN. The most prominent features of the CO2 observations are an increase of the seasonal cycle amplitudes of CO2 and delta(13)C-CO2 in the free troposphere (at 3000 m a.s.l.) by more than 60% from Western Europe to Western and Central Siberia. delta(18)O-CO2 shows an even larger increase of the seasonal cycle amplitude by a factor of two from Western Europe towards the Ural mountains, which decreases again towards the most eastern site, Zotino. These data reflect a strong influence of carbon exchange fluxes with the continental biosphere. In particular, during autumn and winter delta(18)O-CO2 shows a decrease by more than 0.5parts per thousand from Orleans (Western Europe) to Syktyvkar (Ural mountains) and Zotino (West Siberia), mainly caused by soil respiration fluxes depleted in delta(18)O with respect to atmospheric CO2. CH4 mixing ratios in the free troposphere at 3000 m over Western Siberia are higher by about 20-30 ppb if compared to Western Europe. Wetland emissions seem to be particularly visible in July-September, with largest signals at Zotino in 1998. Annual mean CH4 mixing ratios decrease slightly from 1998 to 1999 at all Russian sites. In contrast to CO2 and CH4, which show significant vertical gradients between 2000 and 3000 m a.s.l., N2O mixing ratios are vertically very homogeneous and show no significant logitudinal gradient between the Ural mountains and Western Siberia, indicating insignificant emissions of this trace gas from boreal forest ecosystems in Western Siberia. The growth rate of N2O (1.2-1.3 ppb yr(-1)) and the seasonal amplitude (0:5-1.1 ppb) are similar at both aircraft sites, Syktyvkar and Zotino. For SF6 an annual increase of 5% is observed, together with a small seasonal cycle which is in phase with the N2O cycle, indicating that the seasonality of both trace gases are most probably caused by atmospheric transport processes with a possible contribution from stratosphere-troposphere exchange.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Inst Forest, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Levin, I.; Левин И.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
A trace-gas climatology above Zotino, central Siberia
/ J. Lloyd, N. Tchebakova, O. Shibistova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 749-767
Аннотация: Using light aircraft and at intervals of approximately 14 days, vertical profiles of temperature, humidity, CO2 concentration and C-13/C-12 and O-18/O-16 ratio, as well as concentrations of CH4, CO, H-2 and N2O, from about 80 to 3000 m above ground level have been determined for the atmosphere above a flux measurement tower located near the village of Zotino in central Siberia (60degrees45'N, 89degrees23'E). As well as being determined from flask measurements (typically at heights of 100, 500, 1000, 1500, 2000, 2500 and 3000 m) continuous CO2 concentration profiles at 1 Hz have also been obtained using an infrared gas analyser. This measurement program is ongoing and has been in existence since July 1998. Data to November 2000 are presented and show a seasonal cycle for CO2 concentration of about 25 mumol mol(-1) within the atmospheric boundary layer (ABL) and about 15 mumol mol(-1) in the free troposphere. Marked seasonal cycles in the isotopic compositions Of CO2 are also observed, with that of oxygen-18 in CO2 being unusual: always being depleted in the ABL with respect to the free troposphere above. This is irrespective of whether the CO2 concentration is higher or lower in the free troposphere. We interpret this as indicating a net negative discrimination being associated with the net terrestrial carbon exchange, irrespective of whether photosynthesis or respiration dominates the net carbon flux in this region. During winter flights, large fluctuations in CO2 concentration with height are often observed both within and above the stable ABL. Usually (but not always) these variations in CO2 concentrations are associated with more or less stoichiometrically constant variations in CO and CH4 concentrations. We interpret this as reflecting the frequent transport of polluted air from Europe with very little vertical mixing having occurred, despite the large horizontal distances traversed. This notion is supported by back-trajectory analyses. Vertical profiles Of CO2 concentration with supplementary flask measurements allow more information on the structure and composition of an air mass to be obtained than is the case for flask measurements or for ground-based measurements only. In particular, our data question the notion that there is usually anything like "well mixed background air" in the mid-to-high northern latitudes during the winter months.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Lloyd, J.; Лойд Дж.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
Аннотация: Using light aircraft and at intervals of approximately 14 days, vertical profiles of temperature, humidity, CO2 concentration and C-13/C-12 and O-18/O-16 ratio, as well as concentrations of CH4, CO, H-2 and N2O, from about 80 to 3000 m above ground level have been determined for the atmosphere above a flux measurement tower located near the village of Zotino in central Siberia (60degrees45'N, 89degrees23'E). As well as being determined from flask measurements (typically at heights of 100, 500, 1000, 1500, 2000, 2500 and 3000 m) continuous CO2 concentration profiles at 1 Hz have also been obtained using an infrared gas analyser. This measurement program is ongoing and has been in existence since July 1998. Data to November 2000 are presented and show a seasonal cycle for CO2 concentration of about 25 mumol mol(-1) within the atmospheric boundary layer (ABL) and about 15 mumol mol(-1) in the free troposphere. Marked seasonal cycles in the isotopic compositions Of CO2 are also observed, with that of oxygen-18 in CO2 being unusual: always being depleted in the ABL with respect to the free troposphere above. This is irrespective of whether the CO2 concentration is higher or lower in the free troposphere. We interpret this as indicating a net negative discrimination being associated with the net terrestrial carbon exchange, irrespective of whether photosynthesis or respiration dominates the net carbon flux in this region. During winter flights, large fluctuations in CO2 concentration with height are often observed both within and above the stable ABL. Usually (but not always) these variations in CO2 concentrations are associated with more or less stoichiometrically constant variations in CO and CH4 concentrations. We interpret this as reflecting the frequent transport of polluted air from Europe with very little vertical mixing having occurred, despite the large horizontal distances traversed. This notion is supported by back-trajectory analyses. Vertical profiles Of CO2 concentration with supplementary flask measurements allow more information on the structure and composition of an air mass to be obtained than is the case for flask measurements or for ground-based measurements only. In particular, our data question the notion that there is usually anything like "well mixed background air" in the mid-to-high northern latitudes during the winter months.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Lloyd, J.; Лойд Дж.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Shibistova, Olga Borisovna; Шибистова, Ольга Борисовна
Estimates of regional surface carbon dioxide exchange and carbon and oxygen isotope discrimination during photosynthesis from concentration profiles in the atmospheric boundary layer
/ J.M. Styles et al, N. Tchebakova // Tellus. Series B: Chemical and physical meteorology. - 2002. - Vol. 54B, № 5. - С. 768-783
Аннотация: The integrating properties of the atmospheric boundary layer allow the influence of surface exchange processes on the atmosphere to be quantified and estimates of large-scale fluxes of trace gases and plant isotopic discrimination to be made. Five flights were undertaken over two days in and above the convective boundary layer (CBL) in a vegetated region in central Siberia. Vertical profiles Of CO2 and H2O concentrations, temperature and pressure were obtained during each flight. Air flask samples were taken at various heights for carbon and oxygen isotopic analysis Of CO2. Two CBL budget methods were compared to estimate regional surface fluxes Of CO2 and plant isotopic discrimination against (CO2)-C-13 and (COO)-O-18-O-16. Flux estimates were compared to ground-based eddy covariance measurements. The fluxes obtained for CO2 using the first method agreed to within 10% of fluxes measured in the forest at the study site by eddy covariance. Those obtained from the second method agreed to within 35% when a correction was applied for air loss out of the integrating column and for subsidence. The values for C-13 discrimination were within the range expected from knowledge Of C-3 plant discriminations during photosynthesis, while the inferred O-18 discrimination varied considerably over the two-day period. This variation may in part be explained by the enrichment of chloroplast water during the day due to evaporation from an initial signature in the morning close to source water. Additional potential complications arising from the heterogeneous nature of the landscape are discussed.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, VN Sukachev Forest Inst, Siberian Div, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Styles et al, J.M.; Стайлес Дж.М.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна
Аннотация: The integrating properties of the atmospheric boundary layer allow the influence of surface exchange processes on the atmosphere to be quantified and estimates of large-scale fluxes of trace gases and plant isotopic discrimination to be made. Five flights were undertaken over two days in and above the convective boundary layer (CBL) in a vegetated region in central Siberia. Vertical profiles Of CO2 and H2O concentrations, temperature and pressure were obtained during each flight. Air flask samples were taken at various heights for carbon and oxygen isotopic analysis Of CO2. Two CBL budget methods were compared to estimate regional surface fluxes Of CO2 and plant isotopic discrimination against (CO2)-C-13 and (COO)-O-18-O-16. Flux estimates were compared to ground-based eddy covariance measurements. The fluxes obtained for CO2 using the first method agreed to within 10% of fluxes measured in the forest at the study site by eddy covariance. Those obtained from the second method agreed to within 35% when a correction was applied for air loss out of the integrating column and for subsidence. The values for C-13 discrimination were within the range expected from knowledge Of C-3 plant discriminations during photosynthesis, while the inferred O-18 discrimination varied considerably over the two-day period. This variation may in part be explained by the enrichment of chloroplast water during the day due to evaporation from an initial signature in the morning close to source water. Additional potential complications arising from the heterogeneous nature of the landscape are discussed.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, VN Sukachev Forest Inst, Siberian Div, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Styles et al, J.M.; Стайлес Дж.М.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна
Перераспределение растительных зон и популяций лиственницы сибирской и сосны обыкновенной в Средней Сибири при потеплении климата
/ Н.М. Чебакова, Д.Ж. Рейфельдт, Е.И. Парфенова // Сибирский экологический журнал. - 2003. - Т. 10, № 6. - С. 677-686
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Рейфельдт, Д.Ж.; Reyfel'dt D.Zh.; Парфенова, Елена Ивановна; Parfyenova, Elena Ivanovna; Tchebakova, Nadezhda Mikhaylovna
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Рейфельдт, Д.Ж.; Reyfel'dt D.Zh.; Парфенова, Елена Ивановна; Parfyenova, Elena Ivanovna; Tchebakova, Nadezhda Mikhaylovna
Assessing population responses to climate in Pinus sylvestris and Larix spp. of Eurasia with climate-transfer models
/ G.E. Rehfeldt, N.M. Tchebakova, L.I. Milyutin и др // Eurasian Journal of Forest Research. - 2003. - Vol. 6, № 2. - С. 83-98
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Rehfeldt, G.E.; Рефелдт Г.Е.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Milyutin, Leonid Iosifovich; Милютин, Леонид Иосифович; Parfyenova, Elena Ivanovna; Wykoff, W.R.; Викофф В.Р.; Kuz'mina, Nina Aleksyeyevna
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Rehfeldt, G.E.; Рефелдт Г.Е.; Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Milyutin, Leonid Iosifovich; Милютин, Леонид Иосифович; Parfyenova, Elena Ivanovna; Wykoff, W.R.; Викофф В.Р.; Kuz'mina, Nina Aleksyeyevna
Биоклиматические закономерности размещения фитомассы в Сибири
/ Н.М. Чебакова, Е.И. Парфенова // Структурно-функциональная организация и динамика лесов. - Красноярск : Институт леса им. В.Н. Сукачева СО РАН , 2004. - С. 221-223
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036 Красноярск, Академгородок 50/28
Доп.точки доступа:
Парфенова, Елена Ивановна; Parfyenova, Elena Ivanovna; Tchebakova, Nadezhda Mikhaylovna
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036 Красноярск, Академгородок 50/28
Доп.точки доступа:
Парфенова, Елена Ивановна; Parfyenova, Elena Ivanovna; Tchebakova, Nadezhda Mikhaylovna
Углеродный баланс степей Южной Сибири, измеренный методом вихревых пульсаций
/ Л.Б. Маркезини, Дж. Манка, Н.М. Чебакова, Р. Валентини // Структурно-функциональная организация и динамика лесов. - Красноярск : Институт леса им. В.Н. Сукачева СО РАН , 2004. - С. 400-402
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036 Красноярск, Академгородок 50/28
Доп.точки доступа:
Маркезини, Л.Б.; Markezini L.B.; Манка, Дж.; Manka G.; Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhaylovna; Валентини, Р.; Valentini R.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036 Красноярск, Академгородок 50/28
Доп.точки доступа:
Маркезини, Л.Б.; Markezini L.B.; Манка, Дж.; Manka G.; Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhaylovna; Валентини, Р.; Valentini R.
Зависимости биоразнообразия растительного покрова разных уровней организации от климатических факторов (на примере Средней Сибири)
/ Е.И. Парфенова, Н.М. Чебакова , В.И. Власенко // Сибирский экологический журнал. - 2004. - Т. 11, № 5. - С. 725--734
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50 стр. 28
Доп.точки доступа:
Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhailovna; Власенко, Вера Ивановна; Vlasenko, Vera Ivanovna; Parfyenova, Elena Ivanovna
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50 стр. 28
Доп.точки доступа:
Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhailovna; Власенко, Вера Ивановна; Vlasenko, Vera Ivanovna; Parfyenova, Elena Ivanovna
Monitoring effects of climate warming on desertification of interior steppes of Siberia and Mongolia
: материалы временных коллективов / E.I. Parfenova, N.M. Tchebakova, V.V. Stasova // Ecosystems of Mongolia and frontier areas of adjacent countries: natural resources, biodiversity and ecological prospects. - Ulaanbaatar : MAS and RAS, 2005. - С. 397-399
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Stasova, Victoria Victorovna; Стасова, Виктория Викторовна; Парфенова, Елена Ивановна
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Tchebakova, Nadezhda Mikhailovna; Чебакова, Надежда Михайловна; Stasova, Victoria Victorovna; Стасова, Виктория Викторовна; Парфенова, Елена Ивановна
Climate change and hot spots in tree line shifts in Central Siberia by the end of the XX-th century
: материалы временных коллективов / N. M. Tchebakova, E. I. Parfenova // Climatic changes and their impact on boreal and temperate forests: Abstracts of the International conference (June 5-7, Ekaterinburg, Russia) : Ural State Forest Engineering University, 2006. - С. 95
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Parfyenova, Elena Ivanovna; Парфенова, Елена Ивановна; Чебакова, Надежда Михайловна
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Parfyenova, Elena Ivanovna; Парфенова, Елена Ивановна; Чебакова, Надежда Михайловна
Анатомическое строение листьев степных растений юга Сибири
: материалы временных коллективов / В. В. Стасова [и др.] // Флора и растительность Сибири и Дальнего Востока. Чтения памяти Л.М. Черепнина: мат. Четвертой Российской конф. - 2006. - Т. 2. - С. 250-254
Аннотация: Большинство исследованных растений имеют признаки листа, характерные для растений аридных мест обитания: наличие толстой кутикулы, опушение, плотный, преимущественно палисадный мезофилл. У некоторых растений в листьях присутствует водозапасающая ткань. Большинство растений принадлежит к С3 - типу фотосинтеза. Среди изученных растений к С4 - типу относятся только Kochia prostrata и Cleistogenes squarrosa.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Стасова, Виктория Викторовна; Stasova, Victoria Victorovna; Савельев, Станислав Сергеевич; Savyel'yev Stanislav Sergyeyevich; Бугаенко, Татьяна Николаевна; Bugaenko, Tat'yana Nikolayevna; Чередникова, Юлия Сергеевна; Cherednikova Yuliya Sergeyevna; Парфенова, Елена Ивановна; Parfenova, Elena Ivanovna; Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhailovna
Имеются экземпляры в отделах:
РСФ (04.10.2006г. (1 экз.) - Б.ц.) - свободны 1
Аннотация: Большинство исследованных растений имеют признаки листа, характерные для растений аридных мест обитания: наличие толстой кутикулы, опушение, плотный, преимущественно палисадный мезофилл. У некоторых растений в листьях присутствует водозапасающая ткань. Большинство растений принадлежит к С3 - типу фотосинтеза. Среди изученных растений к С4 - типу относятся только Kochia prostrata и Cleistogenes squarrosa.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Стасова, Виктория Викторовна; Stasova, Victoria Victorovna; Савельев, Станислав Сергеевич; Savyel'yev Stanislav Sergyeyevich; Бугаенко, Татьяна Николаевна; Bugaenko, Tat'yana Nikolayevna; Чередникова, Юлия Сергеевна; Cherednikova Yuliya Sergeyevna; Парфенова, Елена Ивановна; Parfenova, Elena Ivanovna; Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhailovna
Имеются экземпляры в отделах:
РСФ (04.10.2006г. (1 экз.) - Б.ц.) - свободны 1
Глава 10. Лесные экосистемы: организация и динамика. 10.6. Представление климатического и климатопического разнообразия в ГИС и анализ его влияния на биоразнообразие различных уровней организаци растительности
: материалы временных коллективов / Е. И. Парфенова, Н. М. Чебакова // Биоразнообразие и динамика экосистем: информационные технологии и моделирование. - Новосибирск : СО РАН, 2006. - С. 536-547
Аннотация: Климатический оптимум наибольшего видового биоразнообразия - это сбалансированное соотношение тепла и влаги, выраженное индексом сухости около 1,0 (0,8-1,2 при достаточных теплоресурсах около 30-35 ккал умноженное на см2 умноженное на год, реализуемых в подтаежно-лесостепной зоне. Максимум разнообразия породного и типологического состава лесов также отмечается в подтаёжно-лесостепной зоне.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhaylovna; Parfyenova, Elena Ivanovna
Имеются экземпляры в отделах:
РСФ (08.02.2007г. (1 экз.) - Б.ц.) - свободны 1
Аннотация: Климатический оптимум наибольшего видового биоразнообразия - это сбалансированное соотношение тепла и влаги, выраженное индексом сухости около 1,0 (0,8-1,2 при достаточных теплоресурсах около 30-35 ккал умноженное на см2 умноженное на год, реализуемых в подтаежно-лесостепной зоне. Максимум разнообразия породного и типологического состава лесов также отмечается в подтаёжно-лесостепной зоне.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок 50/28
Доп.точки доступа:
Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhaylovna; Parfyenova, Elena Ivanovna
Имеются экземпляры в отделах:
РСФ (08.02.2007г. (1 экз.) - Б.ц.) - свободны 1
Анатомическое строение листьев некоторых степных растений юга Сибири как показатель типа метаболизма
: материалы временных коллективов / В. В. Стасова [и др.] // Опустынивание земель и борьба с ним: Материалы Международной научной конференции по борьбе с опустыниванием (Россия, Республика Хакасия, г. Абакан, НИИ аграрных проблем Хакасии, 16-19 мая 2006 г.). - Абакан : НИИ аграрных проблем Хакасии, 2007. - С. 134-141. - Библиогр. в конце ст.
Аннотация: Глобальные изменения климата вследствие естественных или антропогенных причин могут привести и смещениям границ природных зон и изменениям в растительном покрове. По некоторым прогнозам возможна аридизация климата и расширение площади засушливых регионов даже на юге Сибири. Такие изменения климата привели бы к смещению ботанико-географических зон, смещению ареалов видов и изменению конкурентных взаимоотношений растений в экосистемах.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50, стр., 28
Доп.точки доступа:
Стасова, Виктория Викторовна; Stasova, Victoria Victorovna; Бугаенко, Татьяна Николаевна; Bugaenko, Tat'yana Nikolayevna; Савельев, Станислав Сергеевич; Savyel'yev Stanislav Sergyeyevich; Чередникова, Юлия Сергеевна; Cherednikova Yuliya Sergeyevna; Парфенова, Елена Ивановна; Parfenova, Elena Ivanovna; Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhailovna
Имеются экземпляры в отделах:
Фонд (25.06.2007г. (1 экз.) - Б.ц.) - свободны 1
Аннотация: Глобальные изменения климата вследствие естественных или антропогенных причин могут привести и смещениям границ природных зон и изменениям в растительном покрове. По некоторым прогнозам возможна аридизация климата и расширение площади засушливых регионов даже на юге Сибири. Такие изменения климата привели бы к смещению ботанико-географических зон, смещению ареалов видов и изменению конкурентных взаимоотношений растений в экосистемах.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50, стр., 28
Доп.точки доступа:
Стасова, Виктория Викторовна; Stasova, Victoria Victorovna; Бугаенко, Татьяна Николаевна; Bugaenko, Tat'yana Nikolayevna; Савельев, Станислав Сергеевич; Savyel'yev Stanislav Sergyeyevich; Чередникова, Юлия Сергеевна; Cherednikova Yuliya Sergeyevna; Парфенова, Елена Ивановна; Parfenova, Elena Ivanovna; Чебакова, Надежда Михайловна; Tchebakova, Nadezhda Mikhailovna
Имеются экземпляры в отделах:
Фонд (25.06.2007г. (1 экз.) - Б.ц.) - свободны 1
Climate change and hot spots in tree line shifts in Central Siberia by the end of the 20-th century
: материалы временных коллективов / N. M. Tchebakova, E. I. Parfenova // Climate change and their impact on boreal and temperate forests: Abstracts of the International Conference (June 5-7, 2006, Ekaterinburg, Russia). - 2006. - С. 96
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50, стр., 28
Доп.точки доступа:
Parfenova, Elena Ivanovna; Парфенова, Елена Ивановна; Чебакова, Надежда Михайловна
Имеются экземпляры в отделах:
РСФ (05.02.2008г. (1 экз.) - Б.ц.) - свободны 1
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50, стр., 28
Доп.точки доступа:
Parfenova, Elena Ivanovna; Парфенова, Елена Ивановна; Чебакова, Надежда Михайловна
Имеются экземпляры в отделах:
РСФ (05.02.2008г. (1 экз.) - Б.ц.) - свободны 1