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    Wyświetlanie 1-8 z 8
    Tytuł:
    Timber member resistance to snow and wind loads in Polish mountain zones
    Autorzy:
    Domanski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/52737.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    timber
    resistance
    reduction
    reliability
    safety index
    wood material
    snow load
    wind load
    wood
    Polska
    mountain zone
    Opis:
    The resistance of timber members in structures decreases over time. It depends on the type of load – permanent or variable- and the sort of timber. Strength reduction effects, often referred to as creep-rupture effects, due to long- term loading at high stress ratio levels, are well known for many materials such as aluminum and concrete. Wood materials are greatly affected by a reduction in strength with the duration of permanent and variable loads. The methods for calculating these reductions and the data relevant for structural timber resistance are presented. Based on snow and wind measurements over 45 years from mountain zones in Poland (Zakopane, Świeradów, and Lesko), the reduction factors- kmod for wood members, according to PN-EN – 1995, were estimated.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2015, 58, 195
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mortality, recruitment, and increment of trees in the Fagus-Abies-Picea stands of a primeval character in the lower mountain zone
    Autorzy:
    Jaworski, A
    Kolodziej, Z.
    Lapka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41489.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Dentario glandulosae-Fagetum association
    forest
    Abies alba
    Fagus sylvatica
    development stage
    developmental phase
    tree
    mortality
    recruitment
    increment
    lower mountain zone
    Opis:
    From among three stands, situated in the lower mountain zone, and representing the association Dentario-glandulosae Fagetum, the Łopuszna I stand, being in the growing up stage and phase of selection forest, reached the highest increment (8.5 m3/ha/year, i.e. 1.3% of actual stand volume/ha measured at the end of the control period). Stands, Łopuszna II, being in the stage of an intensive break-up, and Łopuszna III, being in the stage of an initial break-up, reached smaller increments (5.4 and 6.3 m3/ha/year respectively, i.e. each 0.9% of actual stand volume/ha). The greatest tree mortality occurred in stands Łopuszna II and III (14.1 and 10.5 m3/ha/year respectively), and the smallest in the stand Łopuszna I (4.8 m3/ha/year). The knowledge about the value of mortality, recruitment, and increment, expressed in the number of trees and in volume units, may greatly help in planning the amount of cut which would secure sustainability of the forest ecosystem in the layer of trees in the economic as well as in the protection forests, under similar stand and site conditions, managed by the selection cutting permitting to realize the conception of a close-to-nature silviculture.
    Źródło:
    Dendrobiology; 2007, 57; 15-26
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between morphology and glaciomarginal deposition in the fore land area of the Opava Mountains (S Poland)
    Autorzy:
    Salamon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060220.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polska
    Pleistocene
    sedimentology
    mountain foreland
    glaciomarginal zone
    Opis:
    The glaciomarginal zone in front of the Opava Mountains (Eastern Sudetes) shows complex relief. This relief resulted during the Pleistocene in glaciomarginal sedimentation that differed from sedimentation in lowlands. Sedimentological analysis was carried out on deposits of the Odranian Glaciation, when the Scandinavian ice sheet reached its maximum extent in the Eastern Sudetes fore land. Three sites in the foreland of the Opava Mountains, situated in the upper reaches of the Troja River valley, were examined. It appears that the sedimentation was controlled primarily by the relief of the substratum, and changed with the position of the ice front. Glaciomarginal fans of different size formed in the Troja River valley, which was parallel to the ice sheet front. They passed distally into the valley outwash plain, the formation of which was also influenced by mountain rivers, the role of which though changed with time. Occasionally, water flowed from ice-dammed lakes in neighbour ing valleys into the Troja River valley.
    Źródło:
    Geological Quarterly; 2008, 52, 2; 143-143
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sylvicultural procedures in catchment areas of the mountain streams as exemplified by the Skrzyczne massif in Poland
    Autorzy:
    Malek, S.
    Barszcz, J.
    Majsterkiewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/38536.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    catchment area
    mountain stream
    climatic zone
    vegetation zone
    Beskids Mountains
    Skrzyczne massif
    Polska
    headwater
    watercourse
    Opis:
    Extensive disintegration of spruce forests in the Beskidy Mts. in South Poland generates a need to regenerate sizeable areas as well as to rebuild forest stands which have defended themselves against breakdown. In practice, the magnitude of relevant management tasks does not allow for keeping up with the progressive destruction of forest, especially at higher altitudes, where natural regeneration does not occur as much as necessary. In addition, the species composition is limited to spruce, sometimes accompanied by beech and fir, whereas other species have a negligible share. What may be helpful in solving this problem is the method of regeneration of such areas and of establishment of under-canopy cultures, consisting of patchwork, multi-stage regeneration task performance, starting from the areas with the best chance of reforestation success and using the existing self-sown trees. Such areas undoubtedly include habitats with better water balance, i.e. humid habitats (in the case of larger areas, distinguished in the forest management plan as humid forest site types). The aim of the present study was to propose management of watercourses and headwater areas in the region of the Skrzyczne massif where the selected catchments are situated on the southern (the Malinowski Stream) and the northern (the Roztoka Czyrna stream) slopes of this massif. The research was carried out in August 2012 and included juxtaposition of available hydrological maps with actual field conditions along with identification of springs and streams and the course of their beds in order to update the existing data. The updating of the forest numerical maps in the existing databases of the State Forests IT System (SILP) included verification of the course of streams and determination of their nature (penament or periodic) with a division into the existing ones and the added ones. The data was recorded against the background of the division of the forest surface, contour lines, major roads, climate and plant floors and forest habitat types. The total length of streams was ascertained. The catchment areas and areas along their beds were determined by adopting variable distances from the beds, depending on climate and plant zones and the slope gradient. The adopted distances were: 5 m in the upper forest zone, 10 m in the middle forest zone, 20 m in the lower forest zone on both sides of the bed and in the headwater area within the radius of 10 m from a source. Specific sylvicultural procedures in headwater areas and in the neighbourhood of watercourses were described in each climatic and vegetation zones.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2014, 56, 1
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Needle variability of Pinus mugo Turra in the West Tatra Mts.
    Autorzy:
    Boratynska, K
    Powiązania:
    https://bibliotekanauki.pl/articles/41756.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    variability
    mountain pine
    Tatras Mountains
    statistical analysis
    Pinetum mughi carpaticum
    pine
    needle
    bush community
    anatomy
    morphology
    forest zone
    Pinus mugo
    Opis:
    Two year-old needles were collected from 57 individuals from the Tatra Mts. between Grześ and Wołowiec summits. The needles were analysed in respect to 16 morphological and anatomical traits. Data obtained were subject of multivariate statistical analyses. The most stable traits appear to be needle thickness/width ratio, needle thickness and width, and width of epidermal cells. The most variable traits include the distance between vascular bundles and Marcet's coefficient. Intrapopulational variation is low.
    Źródło:
    Dendrobiology; 2002, 48
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność cech szyszek i nasion świerka pospolitego (Picea abies (L.) Karst) w zależności od ich lokalizacji w koronie drzewa
    Variability of the selected traits of Picea abies (L.) Karst. cones and seeds depending on their location in the crown
    Autorzy:
    Jastrzębowski, S.
    Kantorowicz, W.
    Ukalski, K.
    Klisz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/980287.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    swierk pospolity
    Picea abies
    szyszki swierku
    cechy jakosciowe
    nasiona
    jakosc nasion
    lokalizacja w koronie drzewa
    norway spruce
    seeds quality
    crown zone
    cone distribution
    mountain forests
    Opis:
    The objective of the study was to determine whether differences exist between the selected characteristics of Norway spruce cones and seeds depending on their location in the crown. The study was performed in two spruce tree stands growing under mountainous conditions (the Beskidy Mountains, southern Poland). In winter 2015, the cones were collected from 60 standing trees located in the two selected seed stands – Ujsoły and Rycerka. From each tree, the cones were collected from three crown zones: top, central and bottom differing in terms of light conditions. Two characteristics of the cones and six characteristics of the seeds were analysed. To determine quantitative and qualitative traits of seeds standard methods for seed testing were applied. Significant differences between the populations were determined for cone weight and fraction of full seeds, weight of 1000 seeds and germination capacity. The crown zones differed significantly in terms of fraction of cones in the parts of the crown and mass of one cone as well as weight of 1000 seeds, germination energy and germination capacity. Moreover, a significant intra−population variation was observed for a majority of the analysed characteristics (fraction of full seeds, weight of one cone, weight of 1000 seeds, germination energy, and germination capacity). However, no statistically significant interaction between population and crown zone was observed. A significantly lower contribution of cones in the bottom zone of the crown may affect the economic viability of the commercial harvest. On the other hand some of the important seeds traits (e.g. weight of 1000 seeds, germination energy and germination capacity) were significantly better in the bottom and central part of the crown than in the top zone. There are no justified circumstances (both qualitative and quantitative) to perform the cone harvest only from the top zone of the crown.
    Źródło:
    Sylwan; 2019, 163, 01; 3-12
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gleby siedlisk leśnych Żywiecczyzny Cz. I. Siedliska niskiego regla dolnego
    Autorzy:
    Lasota, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1023518.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    siedliska lesne
    Beskid Slaski
    Zywiecczyzna
    lasy gorskie
    Beskid Maly
    Beskid Zywiecki
    lesnictwo
    niski regiel dolny
    forest site type
    mountain forest site
    low elevations of lower montane zone
    west beskidy
    forest soil fertility
    Opis:
    The studies on soil properties affecting forest sites at low elevations (up to 900 m a.s.l.) of the lower montane zone were carried out in the Żywiec region. The paper describes the relationships between forest sites types and underlying parental rock, soil type and subtype, as well as basic physical and chemical properties of soils used for the assessment of their natural fertility and productivity.
    Źródło:
    Sylwan; 2004, 148, 02; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gleby siedlisk leśnych Żywiecczyzny Cz. II. Siedliska wysokich położeń regla dolnego i regla górnego
    Solis of forest site types in Żywiec region Part II. Forest sites at high elevations of the lower montane zone
    Autorzy:
    Lasota, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1023762.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    siedliska lesne
    Beskid Slaski
    gleby lesne
    Beskid Maly
    Beskid Zywiecki
    regiel gorny
    lesnictwo
    wysoki regiel dolny
    forest site type
    mountain forest site
    high elevations of lower montane zone
    west beskidy
    forest soil
    fertility
    Opis:
    The studies on soil properties affecting forest sites at high elevations of the lower (900−1100 m a.s.l.) and upper montane zones were carried out in the Żywiec region. The paper describes the relationships between forest site types and underlying parental rock, soil type and subtype, as well as basic physical and chemical properties of soils used in the assessment of their natural fertility and productivity.
    Źródło:
    Sylwan; 2004, 148, 03; 14-20
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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