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

: материалы временных коллективов / Y. Savva, E. A. Vaganov et al. // Trees. Structure and function. - 2006. - Vol. 20, № 6. - С. 735-746. - Библиогр. в конце ст.
Аннотация: Ring-width chronologies of Picea abies (L.) Karst. from ten sites in the Tatra Mountains, Poland, were developed to explore growth/climate responses in stands along an altitudinal gradient ranging from 839 to 1468 m a.s.l. There were positive relationships between current-year radial growth and mean monthly temperatures in March, April, June, July, but with increasing elevation, the strength of this correlation declined for March-April and increased for June-July temperatures.The mean monthly temperature in October of the previous year positively influenced radial growth of trees at all sites. Lower mean temperatures in January negatively affected growth of trees at high-elevation sites. Trees at the low-elevation sites responded positively to a warm early spring, whereas trees at high-elevation sites showed positive growth responses to higher summer temperatures.

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

Доп.точки доступа:
Savva, Yuliya Vladimirovna; Vaganov, Yevgeny Alexandrovich; Ваганов Евгений Александрович
Имеются экземпляры в отделах:
Др (16.04.2007г. (1 экз.) - Б.ц.) - свободны 1

/ M. . Bryukhanova, P. . Fonti // Trees-Struct. Funct. - 2013. - Vol. 27, Is. 3. - P485-496, DOI 10.1007/s00468-012-0802-8. - Cited References: 45. - This study was supported by Swiss National Foundation through an International short visit (Grant number: #131408) and through the cooperation on the project INTEGRAL (#121859). We would like to thank David Frank and Georg von Arx for their assistance and critical discussion of an earlier version of the manuscript, and Kathlene English and Gregory King for the English review. . - 12. - ISSN 0931-1890РУБ Forestry

Аннотация: Thanks to acclimation, trees overcome environmental changes and endure for centuries. The anatomy of water conducting cells is an important factor determining plant success. Forming cells are coupled with the environment and their properties are naturally archived in the wood. Its variability across tree rings can thus provide a retrospective of plant's hydraulic adjustments. In this work, we measured lumen and wall thickness of tracheids along tree-rings to explore how trees regulate their conducting system under variable plant-water conditions. Tracheids were measured along 51 dated rings of five mature Larix decidua and Picea abies trees from a low elevation site. Anatomical-based chronologies of annual growth performance, hydraulic conductance and safety, and construction costs were built. Similarities among chronologies and the relation to monthly climate data were analyzed. Most parameters displayed high annual plasticity which was partly coherent among trees and mostly associated with radial growth. In general, summer drought reduced growth and potential hydraulic conductivity of the forming ring, and increased hydraulic safety and construction costs. To evaluate the functional relevance of the annual acclimation, the conductivity of the forming ring relative to the entire sapwood needs to be assessed.

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Держатели документа:
[Bryukhanova, Marina] VN Sukachev Inst Forest SB RAS, Krasnoyarsk 660036, Russia
[Fonti, Patrick] WSL Swiss Fed Res Inst, CH-8903 Zurich, Switzerland

Доп.точки доступа:
Bryukhanova, M...; Fonti, P...

/ V. . Ryzhkova, I. . Danilova // Bosque. - 2012. - Vol. 33, Is. 3. - P293-297, DOI 10.4067/S0717-92002012000300011. - Cited References: 15. - This study was supported by Russian Foundation for Basic Research project 10-05-0094, project ZAPAS (Assessment and Monitoring of Forest Resources in the Framework of the EU-Russia Space Dialogue), project 27.32 (Basic Research Program of Presidium RAS) and Interdisciplinary project 14. . - 5. - ISSN 0304-8799РУБ Ecology + Forestry

Аннотация: A method of automated classification and mapping based on a spatial analysis of a digital elevation model (Shuttle Radar Topography Mission (SRTM 90m), Landsat 5-TM imagery, and ground data was applied to classify and map forest site conditions and vegetation on a test site. The vector maps obtained reflected the test site potential environmental conditions, forest types, and regenerating vegetation age stages.

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Держатели документа:
[Ryzhkova, Vera
Danilova, Irina] Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Ryzhkova, V...; Danilova, I...

[Text] / V. I. Kharuk [et al.] // Glob. Ecol. Biogeogr. - 2010. - Vol. 19, Is. 6. - P822-830, DOI 10.1111/j.1466-8238.2010.00555.x. - Cited References: 33. - This research was supported by the NASA Science Mission Directorate, Terrestrial Ecology Program, the Siberian Branch Russian Academy of Science Program no. 23.3.33, and grant no. MK-2497.2009.5. Thanks to Joanne Howl for edits of the manuscript. . - 9. - ISSN 1466-822XРУБ Ecology + Geography, Physical

Аннотация: Aim To evaluate the hypothesis that topographic features of high-elevation mountain environments govern spatial distribution and climate-driven dynamics of the forest. Location Upper mountain forest stands (elevation range 1800-2600 m) in the mountains of southern Siberia. Methods Archive maps, satellite and on-ground data from1960 to 2002 were used. Data were normalized to avoid bias caused by uneven distribution of topographic features (elevation, azimuth and slope steepness) within the analysed area. Spatial distribution of forest stands was analysed with respect to topography based on a digital elevation model (DEM). Results Spatial patterns in mountain forests are anisotropic with respect to azimuth, slope steepness and elevation. At a given elevation, the majority of forests occupied slopes with greater than mean slope values. As the elevation increased, forests shifted to steeper slopes. The orientation of forest azimuth distribution changed clockwise with increase in elevation (the total shift was 120 degrees), indicating a combined effect of wind and water stress on the observed forest patterns. Warming caused changes in the forest distribution patterns during the last four decades. The area of closed forests increased 1.5 times, which was attributed to increased stand density and tree migration. The migration rate was 1.5 +/- 0.9 m year-1, causing a mean forest line shift of 63 +/- 37 m. Along with upward migration, downward tree migration onto hill slopes was observed. Changes in tree morphology were also noted as widespread transformation of the prostrate forms of Siberian pine and larch into erect forms. Main conclusions The spatial pattern of upper mountain forests as well as the response of forests to warming strongly depends on topographic relief features (elevation, azimuth and slope steepness). With elevation increase (and thus a harsher environment) forests shifted to steep wind-protected slopes. A considerable increase in the stand area and increased elevation of the upper forest line was observed coincident with the climate warming that was observed. Warming promotes migration of trees to areas that are less protected from winter desiccation and snow abrasion (i.e. areas with lower values of slope steepness). Climate-induced forest response has significantly modified the spatial patterns of high-elevation forests in southern Siberia during the last four decades, as well as tree morphology.

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Держатели документа:
[Kharuk, Vyacheslav I.
Im, Sergey T.] Sukachev Inst Forest SB RAS, Krasnoyarsk 660036, Russia
[Ranson, Kenneth J.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[Vdovin, Alexander S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Kharuk, V.I.; Ranson, K.J.; Im, S.T.; Vdovin, A.S.

[Text] / M. A. Korets, A. A. Onuchin // Contemp. Probl. Ecol. - 2008. - Vol. 1, Is. 3. - P353-355, DOI 10.1134/S1995425508030107. - Cited References: 7. - The studies were supported by the Foundation of National Science Support and the INTAS-01-0052 project. . - 3. - ISSN 1995-4255РУБ Ecology

Аннотация: Two algorithms are proposed to model ecologically substantiated forest water protection areas using digital elevation method (DEM) and spatial features of a geographic information system (GIS).

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Держатели документа:
[Korets, M. A.
Onuchin, A. A.] RAS, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Korets, M.A.; Onuchin, A.A.

[Text] / G. . Sun [et al.] // Remote Sens. Environ. - 2003. - Vol. 88, Is. 4. - P401-411, DOI 10.1016/j.rse.2003.09.001. - Cited References: 28 . - 11. - ISSN 0034-4257РУБ Environmental Sciences + Remote Sensing + Imaging Science & Photographic Technology

Аннотация: Spaceborne Interferometric SAR (InSAR) technology used in the Shuttle Radar Topography Mission (SRTM) and spaceborne lidar such as Shuttle Laser Altimeter-02 (SLA-02) are two promising technologies for providing global scale digital elevation models (DEMs). Each type of these systems has limitations that affect the accuracy or extent of coverage. These systems are complementary in developing DEM data. In this study, surface height measured independently by SRTM and SLA-02 was cross-validated. SLA data was first verified by field observations, and examinations of individual lidar waveforms. The geolocation accuracy of the SLA height data sets was examined by checking the correlation between the SLA surface height with SRTM height at 90 in resolution, while shifting the SLA ground track within its specified horizontal errors. It was found that the heights from the two instruments were highly correlated along the SLA ground track, and shifting the positions did not improve the correlation significantly. Absolute surface heights from SRTM and SLA referenced to the same horizontal and vertical datum (World Geodetic System (WGS) 84 Ellipsoid) were compared. The effects of forest cover and surface slope on the height difference were also examined. After removing the forest effect on SRTM height, the mean height difference with SLA-02 was near zero. It can be further inferred from the standard deviation of the height differences that the absolute accuracy of SRTM height at low vegetation area is better than the SRTM mission specifications (16 in). The SRTM height bias caused by forest cover needs to be further examined using future spaceborne lidar (e.g. GLAS) data. (C) 2003 Elsevier Inc. All rights reserved.

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Держатели документа:
Univ Maryland, Dept Geog, College Pk, MD 20742 USA
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
VN Sukachev Inst Forest, Krasnoyarsk, Russia
Sci Syst & Applicat Inc, Lanham, MD 20706 USA

Доп.точки доступа:
Sun, G...; Ranson, K.J.; Khairuk, V.I.; Kovacs, K...

[Text] / S. T. Im [et al.] // IGARSS 2003: IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, VOLS I - VII, PROCEEDINGS: LEARNING FROM EARTH'S SHAPES AND SIZES. Ser. IEEE International Symposium on Geoscience and Remote Sensing (IGARSS) : IEEE, 2003. - 23rd International Geoscience and Remote Sensing Symposium (IGARSS 2003) (JUL 21-25, 2003, TOULOUSE, FRANCE). - P2562-2564. - Cited References: 2 . - 3. - ISBN 0-7803-7929-2РУБ Geosciences, Multidisciplinary + Instruments & Instrumentation + Remote Sensing + Imaging Science & Photographic Technology

Аннотация: Radarsat data validity in classification of Siberian plain taiga ecosystems along the Yenisei River (1GBP transect, 90 E) was analyzed. Six test areas were selected. Those areas represent a variety of the main ecosystem and physical-geographical conditions from the tundra to the southern taiga (forest) zones. The analysis of Radarsat signal amplitude, textural characteristics and digital elevation fused data allowed the detection of 18 onground classes. For the purpose of classification the importance of parameters arrange as follows: relief, signal amplitude, skewness, variance, mean Euclidean distance and kurtosis. The main advantage of the Radarsat data is its ability to detect hydromorphic elements (7 bog types were determined).

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Держатели документа:
Sukachev Inst Forest, Krasnoyarsk, Russia

Доп.точки доступа:
Im, S.T.; Gorodzankina, S.M.; Kharuka, V.I.; Ranson, K.J.

[Text] / V. I. Kharuk [et al.] // Russ. J. Ecol. - 2006. - Vol. 37, Is. 5. - P291-298, DOI 10.1134/S1067413606050018. - Cited References: 17 . - 8. - ISSN 1067-4136РУБ Ecology

Аннотация: Climate-related changes that occurred in the Ary-Mas larch forests (the world's northernmost forest range) in the last three decades of the 20th century have been analyzed. An analysis of remote-sensing images made by Landsat satellites in 1973 and 2000 has provided evidence for an increase in the closeness of larch forest canopy (by 65%) and the expansion of larch to the tundra (for 3-10 in per year) and to areas relatively poorly protected from wind due to topographic features (elevation, azimuth, and slope). It has also been shown that the radial tree increment correlates with summer temperatures (r = 0.65, tau = 0.39) and the amounts of precipitation in summer (r = -0.51, tau = 0-41) and winter (r = -0.70, tau = -0.48), decreases with an increase in the closeness of forest canopy (r = -0.52, p > 0.8; tau = -0.48, p > 0.95), and increases with an increase in the depth of soil thawing (r = 0.63, p > 0.9; tau = 0.46, p > 0.9). The density of undergrowth depends on temperatures in winter(tau = 0.53, p > 0.8) and summer (r = 0.98, p > 0.99, tau = 0.9, p > 0.99) and the date of the onset of the growing period (r = -0.60, p > 0.99; T = -0.4, p > 0.99) and negatively correlates with the amount of precipitation in summer (r = -0.56, p > 0.99, T = -0.38, p > 0.99).

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Держатели документа:
Russian Acad Sci, Siberian Div, Sukachev Inst Forest, Krasnoyarsk 660036, Russia
NASA, Goddard Space Flight Ctr, Washington, DC 20546 USA

Доп.точки доступа:
Kharuk, V.I.; Ranson, K.J.; Im, S.T.; Naurzbaev, M.M.

[Text] / V. I. Kharuk, K. J. Ranson, S. T. Im // Int. J. Remote Sens. - 2009. - Vol. 30, Is. 9. - P2377-2388, DOI 10.1080/01431160802549419. - Cited References: 25. - This work funded in part by NASA Science Mission Directorate and Russian Fund of Fundamental Investigations grant no. 06-05-64939. . - 12. - ISSN 0143-1161РУБ Remote Sensing + Imaging Science & Photographic Technology

Аннотация: The spatial pattern of Siberian silkmoth outbreak in south Siberian mountains was analysed based on SPOT VEGETATION data. A digital elevation model (DEM) was also used to relate outbreak area dynamics with topographic elements (elevation, azimuth and slope steepness). To avoid bias of spatial pattern data, areas with a given damage category and with given azimuth, slope steepness and elevation were referenced to the areas with similar parameters within the entire study area. The outbreak began between the elevations of similar to 430-480 m and on south-west slopes with steepness 5 degrees; these conditions appear to be the most favourable pest habitat. As the pest searched for food it moved up and down slope, resulting in an elevation distribution split within a range of similar to 390-540 m and slope steepness up to 15 degrees. In the final phase the azimuth distribution of damaged stands became even, showing that pests at this phase settle in non-optimal habitat. The final outbreak area was similar to 20 000 ha, which is in good agreement with on-ground data. The correlation between the initial phase of infestation and topographic features can be used to prioritize pest monitoring. Data obtained show that the SPOT VEGETATION sensor is applicable for monitoring taiga landscapes vulnerable to Siberian silkmoth outbreaks.

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Держатели документа:
[Kharuk, V. I.
Im, S. T.] VN Sukachev Inst Forest, Krasnoyarsk, Russia
[Ranson, K. J.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Доп.точки доступа:
Kharuk, V.I.; Ranson, K.J.; Im, S.T.; NASA Science Mission Directorate and Russian Fund of Fundamental Investigations [06-05-64939]

[Text] / V. I. Kharuk [et al.] // Scand. J. Forest Res. - 2009. - Vol. 24, Is. 2. - P130-139, DOI 10.1080/02827580902845823. - Cited References: 42. - This research was supported in part by the NASA Science Mission Directorate, Terrestrial Ecology and Cryospheric Sciences Programs and Russian Fund for Fundamental Investigations No. 06-05-64939. Special thanks to Joanne Howl, DVM, for assisting with final preparation of the manuscript. . - 10. - ISSN 0282-7581РУБ Forestry

Аннотация: A warming climate provides competitive advantages to Siberian pine (Pinus sibirica Du Tour) in areas with sufficient precipitation. The warmer temperatures observed in central Siberia over the past three decades appear to have had a noticeable effect on growth of Siberian pine and larch (Larix sibirica Ledeb.) in the south Siberian Mountain forest-tundra ecotone. Larch is more tolerant of harsh climates and exhibits an arboreal growth form, whereas Siberian pine is in krummholz form. Larch also has an advantage at the upper tree limit and in areas with low precipitation. Since the mid-1980s there have been measurable increases in growth increments, stand densification, regeneration propagation into the alpine tundra and transformation of krummholz into arboreal forms. Warming winter temperatures have been sufficient for increased survival of regeneration. Regeneration responded to temperature increase of 1C by migration to areas 10-40 m higher in elevation. Regeneration has propagated into the alpine tundra at the rate of similar to 1.0-2.0 m year-1. Siberian pine and larch regeneration surpassed their upper historical limit by 10-80 m in elevation. While increased tree growth and migration into alpine tundra areas affect the regional carbon balance, it will also decrease albedo, which may increase warming at the regional level.

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Держатели документа:
[Kharuk, Viacheslav I.
Im, Sergey T.
Dvinskaya, Maria L.] VN Sukachev Inst Forest, Krasnoyarsk, Russia
[Ranson, Kenneth J.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Доп.точки доступа:
Kharuk, V.I.; Ranson, K.J.; Im, S.T.; Dvinskaya, M.L.; Terrestrial Ecology and Cryospheric Sciences Programs and Russian Fund for Fundamental Investigations [06-05-64939]

[Text] / V. I. Kharuk, E. S. Kasischke, O. E. Yakubailik // Int. J. Wildland Fire. - 2007. - Vol. 16, Is. 5. - P556-562, DOI 10.1071/WF05009. - Cited References: 14 . - 7. - ISSN 1049-8001РУБ Forestry

Аннотация: In the 1990s, catastrophic fires affected similar to 8 million ha of forest lands in the Russian Far East, including forests of Sakhalin Island. A study that correlated the spatial distribution of burned area and topographic features (elevation, slope, aspect) was carried out for Sakhalin Island. Burned area information derived from forest inventory maps (1935 to 1990) and satellite imagery (1998) was digitised and entered into a Geographic Information System. The burned area locations were correlated with topographic information; the normalisation procedure allows for analysis of the dependence of the fire scars on landscape features. The analyses show that fires occur primarily on the eastern, south- and north-eastern facing areas; > 90% of fires occur at elevations lower than 300 m, and > 95% occur on slopes < 10 degrees. For the period 1935 to 1998, similar to 54% of the Sakhalin Island forest land territory was burned. From the total area of fire scars, formed from 1935 to 1998, 90.5% occurred owing to single fires, 8.6% of fire scars were the result of burning by two fires, 0.9% of fire scars were from three fires, and 0.03% from four fires. A fire return interval for the study region is similar to 120 years.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Forestry, Krasnoyarsk, Russia
Univ Maryland, Dept Geog, College Pk, MD 20742 USA
Russian Acad Sci, Siberian Branch, Inst Comp Modeling, Krasnoyarsk, Russia

Доп.точки доступа:
Kharuk, V.I.; Kasischke, E.S.; Yakubailik, O.E.

[Text] / M. M. Naurzbaev, M. K. Hughes, E. A. Vaganov // Quat. Res. - 2004. - Vol. 62, Is. 2. - P126-133, DOI 10.1016/j.yqres.2004.06.005. - Cited References: 35 . - 8. - ISSN 0033-5894РУБ Geography, Physical + Geosciences, Multidisciplinary

Аннотация: Regional growth curves (RGCs) have been recently used to provide a new basis for removing nonclimatic trend from tree-ring data. Here we propose a different use for RGCs and explore their properties along two transects, one meridional and the other elevational. RGCs consisting of mean ring width plotted against cambial age were developed for larch samples from 34 sites along a meridional transect (55-72degreesN) in central Siberia, and for 24 sites on an elevational gradient (1120 and 2350 in a.s.l.) in Tuva and neighboring Mongolia at approximately 51degreesN. There are systematic gradients of the parameters of the RGCs, such as I-0-maximum tree-ring width near pith, and I-min, the asymptotic value of tree-ring width in old trees. They are smaller at higher latitude and elevation. Annual mean temperature and mean May-September temperature are highly correlated with latitude here, and hence RGC parameters are correlated with these climatic variables. Correlations with precipitation are more complex, and contradictory between meridional and elevational transects. The presence of a similar gradient in the elevational transect is consistent with temperature being the causal factor for both gradients, rather than, for example, latitude-dependent patterns of seasonal photoperiod change. Taking ring measurements from collections of relict and subfossil wood, the RGC-latitude and RGC-temperature relationships are used to estimate paleo-temperatures on centennial time scales. These estimates are consistent with earlier "traditional" dendroclimatic approaches, and with independent information on the northern extent of forest growth in the early mid-Holocene. It may be possible to use this same approach to make estimates of century-scale paleo-temperatures in other regions where abundant relict wood is present. (C) 2004 Univesity of Washington. All rights reserved.

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Держатели документа:
Univ Arizona, Tree Ring Res Lab, Tucson, AZ 85721 USA
Russian Acad Sci, Siberian Branch, Inst Forest, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Naurzbaev, M.M.; Hughes, M.K.; Vaganov, E.A.

[Text] / R. A. Monserud, N. M. Tchebakova // Can. J. For. Res.-Rev. Can. Rech. For. - 1996. - Vol. 26, Is. 6. - P1055-1068, DOI 10.1139/x26-117. - Cited References: 49 . - 14. - ISSN 0045-5067РУБ Forestry

Аннотация: A mountain vegetation model driven by regional climatic parameters was developed for predicting the geographic distribution of the numerous ecosystems of the Sayan Mountain system in southern Siberia. Meteorological data are drawn from normal records of monthly means. Four climatic variables were interpolated to a 10' by 10' grid: temperature, precipitation, vapor pressure, and cloudiness. In addition, albedo was derived by 100-m elevation classes for both windward and leeward slopes as a function of the general type of vegetation surface and the dates of snow occurrence. Ecosystems were classified using a two-dimensional climatic ordination. The first dimension was growing degree-days above a 5 degrees C threshold, and the second was Budyko's dryness index, which is based on annual radiation balance and annual precipitation. The patterns: of predicted vegetation corresponded rather well to observed mapped vegetation. Overall kappa statistics indicated agreement with observed vegetation that varied from fair at the finest resolution (10' by 10' cells) to good at intermediate resolution (30' by 30' cells and 1 degrees by 1 degrees cells) to very good at the coarsest resolution (2 degrees by 2 degrees cells). Focusing on individual vegetation classes, agreement was good to very good for each vegetation class at intermediate resolutions and very good to excellent for each vegetation class at the 2 degrees by 2 degrees resolution. Thus, the general location, pattern, and overall distribution of these mountain ecosystems was accurately predicted. This approach for predicting the spatial distribution of biomes was successfully applied at both the global and subcontinental scale. The successful extension of Budyko's radiation balance approach to mountainous terrain on a finer resolution regional scale indicates the generality of the approach.

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Держатели документа:
RUSSIAN ACAD SCI,FOREST INST,KRASNOYARSK 660036,RUSSIA

Доп.точки доступа:
Monserud, R.A.; Tchebakova, N.M.

/ V. I. Kharuk [et al.] // Arctic, Antarctic, and Alpine Research. - 2013. - Vol. 45, Is. 4. - P526-537, DOI 10.1657/1938-4246-45.4.526 . - ISSN 1523-0430
Аннотация: The goal of the study was to provide an analysis of climate impact before, during, and after the Little Ice Age (LIA) on the larch (Larix gmelinii) tree line at the northern extreme of Siberian forests. Recent decadal climate change impacts on the tree line, regeneration abundance, and age structure were analyzed. The location of the study area was within the forest-tundra ecotone (elevation range 170-450 m) in the Anabar Plateau, northern Siberia. Field studies were conducted along elevational transects. Tree natality/mortality and radial increment were determined based on dendrochronology analyses. Tree morphology, number of living and subfossil trees, regeneration abundance, and age structure were studied. Locations of pre-LIA, LIA, and post-LIA tree lines and refugia boundaries were established. Long-term climate variables and drought index were included in the analysis. It was found that tree mortality from the 16th century through the beginning of the 19th century caused a downward tree line recession. Sparse larch stands experienced deforestation, transforming into tundra with isolated relict trees. The maximum tree mortality and radial growth decrease were observed to have occurred at the beginning of 18th century. Now larch, at its northern boundary in Siberia, is migrating into tundra areas. Upward tree migration was induced by warming in the middle of the 19th century. Refugia played an important role in repopulation of the forest-tundra ecotone by providing a seed source and shelter for recruitment of larch regeneration. Currently this ecotone is being repopulated mainly by tree cohorts that were established after the 1930s. The last two decades of warming did not result in an acceleration of regeneration recruitment because of increased drought conditions. The regeneration line reached (but did not exceed) the pre-LIA tree line location, although contemporary tree heights and stand densities are comparatively lower than in the pre-LIA period. The mean rate of tree line upward migration has been about 0.35 m yr-1 (with a range of 0.21-0.58), which translates to a tree line response to temperature of about 55 m C-1.

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Держатели документа:
V. N. Sukachev Institute of Forest, Krasnoyarsk 660036, Russian Federation
Goddard Space Flight Center, NASA, Code 618, Greenbelt, MD 20771, United States

Доп.точки доступа:
Kharuk, V.I.; Ranson, K.J.; Im, S.T.; Oskorbin, P.A.; Dvinskaya, M.L.; Ovchinnikov, D.V.

/ V. I. Kharuk, K. J. Ranson, E. V. Fedotova // Scandinavian Journal of Forest Research. - 2007. - Vol. 22, Is. 6. - P531-536, DOI 10.1080/02827580701763656 . - ISSN 0282-7581
Аннотация: The latest catastrophic Siberian silkmoth (Dendrolimus superans sibiricus Tschetw.) outbreak occurred in central Siberia during 1994-1996. The relationship between forest stand mortality from insects and topographic features (azimuth, elevation, slope steepness) was analyzed based on a high-resolution digital elevation model, a pest damage map and Terra/MODIS data. It was found that pest-induced forest mortality patterns depend on topographic features. Before the outbreak the major part of host forest species was found within the elevation zone of 150-500 m. After the outbreak, surviving dark-needle stands were found mainly at elevations higher than 400 m. The greatest damage was observed at elevations between 210 and 320 m, whereas maximum mortality was observed at elevations of about 200 m and minimal mortality at elevations of 300 m. With respect to slope steepness, maximum damage for all categories was observed for slopes of 5-20В°. Slightly damaged stands were most common at low slope angle (about 5В° or less), whereas the highest proportion of stands with high tree mortality was found on steeper slopes. With respect to azimuth, insect damage is mostly uniform, with a small increase in damage on the south-west-facing slopes. The spatial pattern of the silkmoth outbreak can provide a basis for prioritizing Siberian silkmoth outbreak monitoring. В© 2007 Taylor & Francis.

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Держатели документа:
Sukachev Institute of Forest, Krasnoyarsk, Russian Federation
NASA's Goddard Space Flight Center, Greenbelt, MD, United States

Доп.точки доступа:
Kharuk, V.I.; Ranson, K.J.; Fedotova, E.V.

/ V. N. Magda, E. A. Vaganov // Izvestiya Akademii Nauk, Seriya Geograficheskaya. - 2006. - Is. 5. - С. 92-100 . - ISSN 0373-2444
Аннотация: Radial growth climatic response of trees growing in middle elevation zone (1000-1700 m) of Altai-Sayany mountainous country was analyzed. Tree-ring sites are mainly located in mountain hollows and slopes of bounding ridges and can be described as mountain forest-steppe ecotones, where the growing conditions are characterized by low moisture. Radial growth of trees from these conditions was compared to tree growth patterns at the upper timberline and in forest-steppe zone. Analysis of extreme growth values and calculation of moving correlation coefficients have shown that tree-growth climatic response in mountain forest-steppe ecotones is mixed and unstable in time. Tree growth is dominated by two major factors - moisture supply and air temperature. At the same time temperature can influence tree-growth negatively as well as positively. Instability of the climatic response consists in that sing and percent of air temperature contribution to growth value changes in time. It was also revealed that the cause of climatic response instability is air temperature dynamics, i.e. alternate cooling and warming. В© 2006 V. N. Magda, E. A. Vaganov.

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Держатели документа:
Institute of Forest, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Magda, V.N.; Vaganov, E.A.

/ G. Sun, K. J. Ranson, V. I. Kharuk // Remote Sensing of Environment. - 2002. - Vol. 79, Is. 2-3. - P279-287, DOI 10.1016/S0034-4257(01)00279-6 . - ISSN 0034-4257
Аннотация: We investigated the possibility of using multiple polarization (SIR-C) L-band data to map forest biomass in a mountainous area in Siberia. The use of a digital elevation model (DEM) and a model-based method for reducing terrain effects was evaluated. We found that the available DEM data were not suitable to correct the topographic effects on the SIR-C radar images. A model-based slope correction was applied to an L-band cross-polarized (hv) backscattering image and found to reduce the topographic effect. A map of aboveground biomass was produced from the corrected image. The results indicated that multipolarization L-band synthetic aperture radar (SAR) data can be useful for estimation of total aboveground biomass of forest stands in mountainous areas. В© 2002 Elsevier Science Inc. All rights reserved.

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Держатели документа:
Department of Geography, University of Maryland, College Park, MD 20742, United States
NASA's Goddard Space Flight Center, Code 923, Greenbelt, MD 20771, United States
Sukachev Institute of Forest, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sun, G.; Ranson, K.J.; Kharuk, V.I.

/ K. J. Ranson [et al.] // Remote Sensing of Environment. - 2001. - Vol. 75, Is. 2. - P188-200, DOI 10.1016/S0034-4257(00)00166-8 . - ISSN 0034-4257
Аннотация: This paper examines the use of space-borne radar data to map forest types and logging in the mountainous Western Sayani area in central Siberia. L- and C- band HH-, HV-, and VV-polarized images from the Shuttle Imaging Radar-C instrument were used in the study. Techniques to reduce topographic effects in the radar images were investigated. These included radiometric correction using illumination angle inferred from a digital elevation model and reducing apparent effects of topography through band ratios. Forest classification was performed after terrain correction utilizing typical supervised techniques and principal component analyses. An ancillary data set of local elevations was also used to improve the forest classification. Map accuracy for each technique was estimated for training sites based on Russian forestry maps, satellite imagery, and field measurements. The results indicate that it is necessary to correct for topography when attempting to classify forests in mountainous terrain. Radiometric correction based on a digital elevation model improved classification results but required reducing the synthetic aperture radar resolution to match the digital elevation model. Using ratios of synthetic aperture radar channels that include cross-polarization improved classification and had the advantages of eliminating the need for a digital elevation model and preserving the full resolution of the synthetic aperture radar data. В© Elsevier Science Inc., 2001.

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Держатели документа:
NASA's Goddard Space Flight Center, Code 923, Greenbelt, MD, United States
Department of Geography, University of Maryland, College Park, MD, United States
V. N. Sukachev Institute of Forest, Academgorodok, Krasnoyarsk, Russian Federation
Science Systems and Applications, Inc., Lanham, MD, United States
NASA's Goddard Space Flight Center, Code 923, Greenbelt, MD 20771, United States

Доп.точки доступа:
Ranson, K.J.; Sun, G.; Kharuk, V.I.; Kovacs, K.

/ V. I. Kharuk [et al.] // Forest Ecology and Management. - 2013. - Vol. 310. - P312-320, DOI 10.1016/j.foreco.2013.08.042 . -
Аннотация: The causes and resulting spatial patterns of Siberian pine mortality in eastern Kuznetzky Alatau Mountains, Siberia were analyzed based on satellite (Landsat, MODIS) and dendrochronology data. Climate variables studied included temperature, precipitation and Standardized Precipitation-Evapotranspiration Index (SPEI) drought index. Landsat data analysis showed that stand mortality was first detected in the year 2006 at an elevation of 650m, and extended up to 900m by the year 2012. Mortality was accompanied by a decrease in MODIS-derived vegetation index (EVI). The area of dead stands and the upper mortality line were correlated with increased drought. The uphill margin of mortality was limited by elevational precipitation gradients. Dead stands (i.e., >75% tree mortality) were located mainly on southern slopes. With respect to slope, mortality was observed within a 7-20В° range with greatest mortality occurring on convex terrain. Tree radial increment measurements correlate and were synchronous with SPEI (r2=0.37, rs=80). The results also showed the primary role of drought stress on Siberian pine mortality. A secondary role may be played by bark beetles and root fungi attacks. The observed Siberian pine mortality is part of a broader phenomenon of "dark needle conifers" (DNC, i.e., Siberian pine, fir and spruce) decline and mortality in European Russia, Siberia, and the Russian Far East. All locations of DNC decline coincided with areas of observed drought increase. The results obtained are one of the first observations of drought-induced decline and mortality of DNC at the southern border of boreal forests. Meanwhile if model projections of increased aridity are correct DNC within the southern part of its areal may be replaced by drought-resistant Pinus silvestris and Larix sibirica. В© 2013 Elsevier B.V.

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Держатели документа:
V.N. Sukachev Institute of Forest, Siberian Federal University, Krasnoyarsk, Russian Federation
NASA's Goddard Space Flight Center, Greenbelt, MD 20771, United States

Доп.точки доступа:
Kharuk, V.I.; Im, S.T.; Oskorbin, P.A.; Petrov, I.A.; Ranson, K.J.

/ G. Sun [et al.] // Eurasian Arct. Land Cover and Land Use in a Changing Climate. - 2011. - P53-77, DOI 10.1007/978-90-481-9118-5_4 . -
Аннотация: Monitoring the dynamics of the circumpolar boreal forest (taiga) and Arctic tundra boundary is important for understanding the causes and consequences of changes observed in these areas. Because of the inaccessibility and large extent of this zone, remote sensing data can play an important role for the purposes. In this study, climate-related changes that occurred in the Ary-Mas larch forests (the world's northernmost forest range) in the last three decades of the twentieth century were analyzed. An analysis of Landsat images in 1973 and 2000 has provided evidence for an increase in the closeness of larch forest canopy by 65% and the expansion of larch to the tundra for 3-10 m per year and to areas relatively poorly protected from wind due to topographic features (elevation, azimuth, and slope). It was found that a tundra-taiga transitional area can be characterized using multi-spectral Landsat ETM+ summer images, multi-angle MISR red band reflectance images, RADARSAT images with larger incidence angle, or multi-temporal and multi-spectral MODIS data. Because of different resolutions and spectral regions covered, the transition zone maps derived from different data types were not identical, but the general patterns were consistent. В© 2011 Springer Science+Business Media B.V.

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Держатели документа:
Department of Geography, University of Maryland, Greenbelt, MD 20771, United States
Biospheric Sciences Branch, NASA/GSFC, Code 923, Greenbelt, MD 20771, United States
NASA's Goddard Space Flight Center, Greenbelt, MD 20771, United States
V.N. Sukachev Institute of Forest, SB RAS, Academgorodok, 50, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sun, G.; Ranson, K.J.; Kharuk, V.I.; Im, S.T.; Naurzbaev, M.M.