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    Wyświetlanie 1-12 z 12
    Tytuł:
    Kształtowanie się smukłości pni dębu szypułkowego (Quercus robur L.) w zależności od wieku drzew
    Forming slendernes of pedunculate oak stems [Quercus robur L.] in dependence of age of trees
    Autorzy:
    Kaźmierczak, K.
    Pazdrowski, W.
    Mańka, K.
    Szymański, M.
    Nawrot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012526.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    smuklosc drzew
    wiek drzew
    Quercus robur
    lesnictwo
    dab szypulkowy
    drzewa lesne
    slenderness
    pedunculate oak
    stand stability
    age
    Opis:
    Paper identifies value and variability of slenderness of pedunculate oak stems in age range from 10 to 140 years describing slenderness of tree stems simultaneously using linear and multiplies regression. Strength of the connections between slenderness and selected dendrometrical traits was also defined. Dependence of the slenderness was investigated with respect to height, breast height diameter, and 10−years increment of breast height diameter, volume and 10−years volume increment in specific years of tree life. The slenderness of trees decreases with the growth of breast height diameter, breast height diameter increment, volume and volume increment. In case of height opposite tendency was observed. Dependence of slenderness on breast height diameter, height and age was analysed for all trees altogether as well. Slenderness was described additionally with linear and multivariate empirical equations.
    Źródło:
    Sylwan; 2008, 152, 07; 39-45
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kształtowanie się smukłości modrzewia europejskiego (Larix decidua Mill.) w zależności od siedliska, wieku i pozycji biosocjalnej
    Effect of forest habitat type, age and biosocial position on the slenderness of European larch (Larix decidua Mill.)
    Autorzy:
    Kaźmierczak, K.
    Nawrot, M.
    Pazdrowski, W.
    Najgrakowski, T.
    Jędraszak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008902.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    smuklosc drzew
    modrzew europejski
    Larix decidua
    klasy wieku
    warunki siedliskowe
    pozycja biosocjalna drzew
    slenderness
    forest habitat types
    biosocial position
    larch
    Opis:
    The study presents the results of MANOVA of tree slenderness. The study material comprised 72 larch trees in a dominant stand of different age classes growing in fresh mixed coniferous (BMśw), fresh mixed deciduous (LMśw) and fresh deciduous (Lśw) forest habitats. The slenderness of each larch tree was calculated as the ratio of tree height [m] to breast height diameter [cm]. Basic statistical characteristics were also established. A three−way analysis of variance was performed assessing the statistical significance of the impact of forest habitat type, age and biosocial position of trees in the stand. A similar analysis was done for two basic measurement characteristics of trees – breast height diameter and height.
    Źródło:
    Sylwan; 2011, 155, 07; 472-481
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wskaźniki stabilności drzew w drzewostanach sosnowych uszkodzonych przez wiatr
    Indices of tree stability in Scots pine stands damaged by wind
    Autorzy:
    Jelonek, T.
    Walkowiak, R.
    Jakubowski, M.
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/993204.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    uszkodzenia drzew
    wiatry
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    stabilnosc
    smuklosc drzew
    srodek ciezkosci
    dlugosc korony
    objetosc korony
    scots pine
    stability
    wind
    damage
    Opis:
    The aim of the study was to determine the effect of selected tree stability indices described by individual biometric characteristics on the formation of their wind resistance. The analysis of tree stability was based on easily measurable tree traits, such as height, breast height diameter, crown parameters as well as the centre of gravity and slenderness factor. Investigations were conducted in wind−damaged Scots pine stands, where a total of over 600 trees were measured, of which almost 40% specimens were wind−broken. Results indicate that a significant role in the modification of tree stability is played by the slenderness factor, the location of the centre of gravity and crown parameters. Most of the analysed traits are strongly cross−correlated. However, these are slenderness and crown length that describe tree stability the best.
    Źródło:
    Sylwan; 2013, 157, 05; 323-329
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smukłość drzew w drzewostanach robiniowych
    Slenderness of trees in black locust stands
    Autorzy:
    Bijak, S.
    Orzoł, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1292422.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewostany robiniowe
    drzewa lesne
    robinia akacjowa
    Robinia pseudoacacia
    smuklosc drzew
    typy siedliskowe lasu
    klasy wieku
    klasy Krafta
    pozycja biosocjalna drzew
    korony drzew
    slenderness
    Kraft class
    age class
    crown parameters
    Opis:
    This paper investigates the slenderness of black locust (Robinia pseudoacacia) trees in relation to the biosocial status of the trees, stand age class, crown parameters and habitat type. The research material was collected on 35 research plots in the Sława Śląska, Sulechów and Głogów forest districts in western Poland and comprises 1058 trees. For each tree, we measured its height (h) as well as its diameter at breast height (d) and determined the biosocial status (Kraft class), crown length (CL) and relative crown length (rCL). The age class and habitat type were assessed at the plot level. Because the obtained values for slenderness (s=h/d) diverged significantly from the normal distribution, we used Kruskal-Wallis and Mann-Whitney tests to investigate the influence of the above-mentioned parameters on the h/d ratio. Black locust slenderness ranged from 0.31 to 1.95 with an average of 0.91 (standard deviation 0.24). It furthermore differed significantly between Kraft classes (the higher the biosocial status, the lower the slenderness) and age classes (the older the trees, the lower their slenderness). We also found a significant effect of the habitat type (in oligotrophic sites trees formed more slender trunks than in mesotrophic sites) and crown parameters on the h/d ratio (decreasing with increasing crown length and relative crown length). The obtained results suggest that the slenderness of black locust does not differ substantially from native broadleaved trees in Poland.
    Źródło:
    Leśne Prace Badawcze; 2018, 79, 2
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ rzeźby terenu na bonitację i cechy wzrostowe drzewostanów sosnowych na wydmach Kotliny Toruńskiej
    Impact of land relief on site index and growth parameters of Scots pine stands on inland dunes in the Torun Basin
    Autorzy:
    Sewerniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989617.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Kotlina Torunska
    rzezba terenu
    ekspozycja terenu
    drzewostany sosnowe
    sosna zwyczajna
    Pinus sylvestris
    wzrost roslin
    wysokosc drzew
    piersnice drzew
    smuklosc drzew
    bonitacja drzewostanow
    topography
    pinus sylvestris
    slope aspect
    tree growth
    forest site
    soil
    inland dunes
    Opis:
    The aim of the study was to determine the impact of land relief on site index and growth parameters (height, diameter, slenderness) of Scots pine (Pinus sylvestris) stands on inland dunes in the Toruń Basin (N Poland). The study was conducted on 150 plots situated on north− and south−facing dune slopes (54 pairs of twin plots) as well as in intra−dune depressions (42 plots). Height and diameter of ten the thickest pines per 0.1 hectare was measured, and next site index as a potential height of a stand at the age of 100 years was calculated. As the results of the used equation, site index was strongly (R²=0.58) negatively biased to age, so the bias was removed using an elaborated regression model. For stands older than ca. 20 years, the clear higher site index values as well as higher heights and diameters were found for intra−dune depressions than for slopes of the two studied aspects. This was explained by the occurrence of much more fertile and moister soils in depressions. The only age class for which the advantage of site index and growth parameters was not stated for depressions was the youngest class (≤20 years old). This was likely caused by the competitive impact on young pines of Calamagrostis epigejos which prefers intra−dune depressions on inland dunes and forms in forest floor usually dense cover in this position. Impact of contrasting slope aspect was clearly related in the study to age of a stand. For the youngest studied age class both site index values as well as heights and diameters were lower on north− than on south−facing slopes. This was explained by the effect of weeds which form more dense cover on slopes of this aspect than on sunny slopes. For older stands; however higher site index values as well as heights and diameters were revealed for north−facing slopes, due to pines likely took advantage of higher moisture of soils occurring in this place. With reference to slenderness, regardless stand age the parameter was regularly the highest for north− than both for south−facing slopes and depressions. Because of the revealed distinct higher productivity of intra−dune depressions in normally dry and poor in nutrients dune landscape, it could be reasonable to use the depressions to introduce admixtures of broadleaved tree species into pine monocultures on inland dunes.
    Źródło:
    Sylwan; 2016, 160, 08; 647-655
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smukłość modrzewia europejskiego (Larix decidua Mill.) i jej związki z innymi cechami biometrycznymi
    Slenderness of European larch (Larix decidua Mill.) and its relationships to other biometric parameters
    Autorzy:
    Kaźmierczak, K.
    Nawrot, M.
    Pazdrowski, W.
    Jędraszak, A.
    Najgrakowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/994964.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    siedliska lesne
    modrzew europejski
    Larix decidua
    smuklosc drzew
    wiek drzew
    piersnice drzew
    wysokosc drzew
    powierzchnia rzutu korony
    srednica korony
    dlugosc korony
    korelacja cech
    larch
    slenderness
    age
    forest habitat type
    tree growth area
    crown projection area
    Opis:
    The study presents the relationships between larch slenderness and age, breast height diameter, height, crown width, crown projection area, crown length and habitat type. The study comprised larch trees in a dominant stand of different age classes growing in fresh mixed coniferous (BMśw), fresh mixed deciduous (LMśw) and fresh deciduous (Lśw) forest habitats. The slenderness of each larch was calculated as the ratio of tree height to breast height diameter. The crown projection area was calculated as a circle with a radius equal to the average radius of the crown. The average crown radius was established after its projection in the four main geographical directions. The crown length was calculated as the difference between the height of a tree and the height of crown location. Also an attempt was made to describe tree slenderness using multiple regression equations.
    Źródło:
    Sylwan; 2012, 156, 02; 83-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wybranych czynników ekologicznych na kształtowanie się stabilności górskich drzewostanów świerkowych w Beskidach Zachodnich
    Effect of selected ecological factors on the stability of Norway spruce stands in the Beskidy Zachodnie Mountains
    Autorzy:
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013526.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    smuklosc drzew
    intensywnosc przyrostu miazszosci
    Picea
    lasy gorskie
    drzewostany swierkowe
    stabilnosc
    przyrost miazszosci
    lesnictwo
    wzgledna dlugosc korony
    wskaznik stabilnosci
    swierk
    czynniki ekologiczne
    drzewa lesne
    slenderness
    relative crown length
    volume increment
    topographic features
    stand density
    Opis:
    The research focused on the effect of environmental factors on the stability of mountain spruce forests in the Beskidy Zachodnie. Stand stability was evaluated on the basis of slenderness, relative crown length and intensity of volume increment. The performed analyses show that stands growing at higher elevations are more stable. This is related, among other things, to worse environmental conditions resulting in the lower slenderness value and higher relative crown length.
    Źródło:
    Sylwan; 2008, 152, 03; 40-49
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związki między wybranymi parametrami korony a cechami makrostruktury i gęstością drewna daglezji zielonej (Pseudotsuga menziesii var. viridis Franco)
    Relationships between selected crown parameters and the macrostructure properties and density of Douglas fir [Pseudotsuga menziesii var. viridis Franco] wood
    Autorzy:
    Wąsik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009000.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    daglezja zielona
    Pseudotsuga menziesii
    korony drzew
    dlugosc korony
    szerokosc korony
    smuklosc korony
    drewno daglezjowe
    przyrosty roczne
    sloje przyrostu rocznego
    gestosc drewna
    korelacja cech
    douglas fir
    wood
    crown
    poland
    Opis:
    The paper presents an analysis of interactions between the selected tree crown parameters and the macrostructure properties and density of wood of Douglas fir growing in the territory of Poland. The correlation coefficients between crown parameters and wood properties were calculated and difference significance tests were performed for the selected properties.
    Źródło:
    Sylwan; 2010, 154, 11; 783-790
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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