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    Wyświetlanie 1-7 z 7
    Tytuł:
    Ksztaltowanie z wiekiem dlugosci korony olszy czarnej [Alnus glutinosa [L.]Gaertn.]
    Autorzy:
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/973050.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wiek drzew
    olsza czarna
    Alnus glutinosa
    drzewa lesne
    względna długość korony
    leśnictwo
    długość korony
    długość absolutna
    absolute crown length
    relative crown length
    primary crown
    secondary crown
    Opis:
    The paper provides research results concerning the relationship between age, absolute height and relative crown length of black alder. Analysis of the ratio of relative crown length to tree height of black alder trees allowed to develop a crown length model. Alder is capable of producing a secondary crown, which entails the shortening of the non−branched section of the trunk. A relationship has been found between the length of the primary crown and the length of the secondary crown depending on elongation of the secondary crown at the cost of shortening of the primary crown.
    Źródło:
    Sylwan; 2003, 147, 11; 47-53
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Variability of Selected Features of the Morphological Structure of Scots Pine Introduced on a Reclaimed Waste Dump of a Former Sulfur Mine in Piaseczno
    Autorzy:
    Pająk, M.
    Wąsik, R.
    Michalec, K.
    Płoskoń, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/125306.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    forest reclamation
    post-mining areas
    diameter at breast height
    tree height
    crown length and width
    Opis:
    This paper presents the results of studies on the variability of selected features of the morphological structure of Scots pine trees, introduced on the post-mining lands in Piaseczno reclaimed for forestry. The field research was conducted in 2014 in the north-western part of a waste dump, on one-are circular sample plots. These plots were established in three groups, depending on the type of a substrate and the implemented reclamation treatments (1 – the Quaternary loose sands, 2 – mixed sediments of the Quaternary loose sands and the Tertiary Krakowiec clays, 3 – mixed sediments of the Quaternary loose sands and the Tertiary Krakowiec clays after an intensive preplant fertilization). The Scots pine trees introduced on the reclaimed dump displayed various crown structures and growth parameters. The longest and the widest crowns were recorded for the pine trees growing on mixed sediments of sands and clays, whereas the trees growing on loose sands had the smallest diameters at breast height.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 4; 83-90
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biometric characterisation of selected seed stands of Picea abies (L.) Karst. of Istebna
    Autorzy:
    Orzel, S
    Forgiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41646.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Norway spruce
    Picea abies
    seed stand
    site condition
    growing
    tree
    biometric characteristics
    statistics
    spruce tree
    crown length
    mountain vegetation
    Opis:
    The paper assesses the growth of nine seed stands of Picea abies (L.) Karst. of Istebna. The stands were selected on the basis of the dynamic height growth and good adaptation of their progeny under different site conditions. The d.b.h. increment of trees during the entire lifespan of stands is analysed in detail, especially its magnitude and dynamics during the last twenty years, i.e. from 1982 to 2001.
    Źródło:
    Dendrobiology; 2004, 51 Supplement
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związek wysokości z wybranymi cechami korony czteroletniej brzozy brodawkowatej (Betula pendula Roth)
    The relationship between height and crown characteristics of four-year-old common birch (Betula pendula Roth)
    Autorzy:
    Klepacki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1292448.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    brzoza brodawkowata
    Betula pendula
    wysokosc drzew
    korony drzew
    szerokosc korony
    dlugosc korony
    przestrzen wzrostu
    korelacja cech
    tree height
    crown width
    crown length
    growth space
    common birch
    forest culture
    Opis:
    This paper presents the results of an analysis on characteristics of birch crowns (Betula pendula Roth) in relation to measures of the growth space occupied by a single tree at a young age. It also presents the relationships between the seedling height and certain crown characteristics. The study focused on four-year-old common birches growing in four different areas in the Elk Forest District in either fresh mixed coniferous or broadleaved forest. The measurements conducted on the chosen trees were used to calculate their crown characteristics such as crown diameter, length, height to the crown base, relative length and spread. They were also used to determine the growth characteristics of a single tree’s growth space, such as the crown area projected onto the ground, single tree space and the percentage use of unit area. Furthermore, fresh and dry leaf mass was determined. The birches growing in the fresh mixed coniferous forest reached an average height of 1.30 m, whereas in the fresh mixed broadleaved forest, the height of the trees was lower and amounted to 0.67 m. 95% of the trees had crown diameters of 0.57 m to 0.74 m in the fresh mixed coniferous forest, but only 0.19 m to 0.25 m in the fresh mixed broadleaved forest. The average lengths of the crowns in the fresh mixed coniferous and broadleaved forests amounted to 0.97 m and 0.37 m respectively. The author shows that there is a statistically significant correlation between the seedling height and the other examined characteristics. The best correlation was found between the height and the length of the crown (r=0.9858) for birches growing in the fresh mixed coniferous forest and between the height and single tree space (r=0.8468) for birches growing in the fresh mixed broadleaved forest.
    Źródło:
    Leśne Prace Badawcze; 2017, 78, 2
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wielkości luki na wzrost i rozwój jodły pospolitej (Abies alba Mill.) w drzewostanach mieszanych w rezerwacie Jata
    The effect of canopy gaps on growth and development of silver fir [Abies alba Mill.] regeneration in mixed stands in the Jata reserve
    Autorzy:
    Dobrowolska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/973193.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    rezerwat Jata
    Abies alba
    rezerwaty przyrody
    odnowienia naturalne
    odnowienia podokapowe
    jodła pospolita
    wzrost roślin
    żywotność
    leśnictwo
    drzewa leśne
    silver fir
    canopy gaps
    vitality
    crown length
    Opis:
    The study was carried out in mixed stands in Jata reserve. All gaps over than 20 m2 were localized. The aim of the study was to describe the structure and vitality of silver fir regeneration in gaps and under stand canopy. Following hypothesis was tested: better condition for fir growth is in small gaps, in bigger gaps fir is decreased by the development of deciduous tree species. It was found that gap size did not influence on the quantity of fir regeneration. The hypothesis was rejected. In mixed stands of the Jata reserve fir was not the dominant tree species not only in gaps but also under the stand canopy. The vitality of fir trees has been improved in last years, what suggests the increment in tree crowns lenght.
    Źródło:
    Sylwan; 2007, 151, 03; 29-35
    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 cechami drzewa a niektórymi właściwościami drewna młodocianego sosny zwyczajnej (Pinus sylvestris L.)
    Relationships between selected tree characteristics and the properties of juvenile wood in Scots pine (Pinus sylvestris L.)
    Autorzy:
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312952.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    cechy morfologiczne
    wysokosc drzew
    piersnice drzew
    wysokosc osadzenia pierwszej zywej galezi
    srednica korony
    dlugosc korony
    drewno sosnowe
    drewno mlodociane
    gestosc drewna
    gestosc umowna
    wytrzymalosc na sciskanie wzdluz wlokien
    wytrzymalosc na zginanie statyczne
    modul elastycznosci przy zginaniu
    korelacja cech
    basic density
    strength perpendicular to grain
    bending strength
    modulus of elasticity
    breast height
    diameter
    tree height
    crown length
    crown diameter
    Opis:
    The aim of this study was to determine relationships between selected properties of juvenile wood and characteristics of the stem and crown of Scots pine. Analyses were conducted in northern Poland in eight mature pine monocultures. Nine trees were selected in each experimental site and their stems were divided into five sections. The centers of the sections were established at a height of 1.3 m from the tree base and at points corresponding to 20, 40, 60 and 80% tree height. Samples were taken from these locations, and these samples were prepared for analyses of basic density, compressive strength along the grain and static bending, as well as the modulus of elasticity during bending. The mean height of the investigated group of trees was 26.0 m with an average diameter breast high of 33.6 cm. The mean crown depth was 7.8 m and crown diameter was 3.6 m, and the mean basic density (Qu) of juvenile pine wood was 416 kg/m3. The average compressive strength along the grain (CS) was determined to be 22.3 MPa, while static bending strength (BS) was 45.8 MPa. The recorded modulus of elasticity (MOE) was 4726 MPa. Both in general terms and when dividing stems into sections, the wood properties correlated with tree characteristics to various degrees. All indexes were negative indicating that trees of greater dimensions produce juvenile wood of inferior quality. Properties of juvenile wood formed during various periods of tree life were mostly related to diameter breast high and crown depth. They were also correlated with tree height, but only to a limited extent. In contrast, properties of wood from the middle stem sections were significantly correlated with crown diameter.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 3; 237-244
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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