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    Wyświetlanie 1-3 z 3
    Tytuł:
    Parametry techniczne młodocianego i dojrzałego drewna sosny zwyczajnej (Pinus sylvestris L.)
    Technical parameters of juvenile and mature wood in Scots pine (Pinus sylvestris L.)
    Autorzy:
    Tomczak, A.
    Jelonek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008693.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    uzytkowanie lasu
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    drewno mlodociane
    drewno dojrzale
    parametry techniczne
    wytrzymalosc na sciskanie wzdluz wlokien
    wytrzymalosc na zginanie statyczne
    wspolczynnik jakosci wytrzymalosciowej
    basic density
    compression strength along the grain
    static bending strength
    coefficient of quality of strength
    Opis:
    The study compares selected technical parameters of juvenile and mature wood from different stem sections of Scots pine trees, i.e. breast height diameter, mid−length of the section between breast height and the base of live crown and from the base of live crown. Statistically significant differences were found mainly in relation to mature wood, which indicates that juvenile wood in terms of technical quality is a more homogeneous zone.
    Źródło:
    Sylwan; 2012, 156, 09; 695-702
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Promieniowa zmienność właściwości drewna sosny zwyczajnej (Pinus sylvestris L.) wyrosłej na gruntach porolnych
    Radial variation in the wood properties of Scots pine (Pinus sylvestris L.) grown on former agricultural soil
    Autorzy:
    Tomczak, A.
    Jelonek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1339968.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    gestosc drewna
    gestosc umowna
    wytrzymalosc na sciskanie wzdluz wlokien
    wytrzymalosc na zginanie statyczne
    zmiennosc cech
    czynniki siedliska
    grunty porolne
    basic density
    static bending strength
    compressive strength along fibers
    Opis:
    The soil of former farmland greatly differs from forest soil, and significantly influences tree growth and development compared with other site factors. The effect may also be reflected indirectly in radial variability of wood. This study compared radial variation of wood density, compressive strength along the grain and static bending strength of wood of Scots pine trees growing on former farmland and forest soils. The analyses were conducted in eight mature pine stands. On the basis of the stand description, four stands were classified as growing on forest soil (L) and four as growing on former farmland soil (P). A total of 24 model trees were selected, twelve on each soil type. Analyses of wood properties were conducted along four axes from the cross sectional radius of the treesat breast height. Our analyses showed that radial variation in wood properties of Scots pine (from selected locations in Poland) growing on former farmland is similar to the variation among the control trees growing on forest soils. In both groups of trees, the lowest density and the lowest strength were in the pith (juvenile) zone. Wood with the highest density and greatest strength was located in the central part of the radius. Wood of Scots pine trees growing on former farmland soils in comparison to that of trees growing on forest soil was characterised by a statistically lower basic density, lower compressive strength along the grain and static bending strength.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 2; 171-177
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    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 1-3 z 3

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