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    Wyświetlanie 1-8 z 8
    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
    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:
    Porównanie wybranych właściwości fizycznych drewna młodocianego i dojrzałego sosny zwyczajnej (Pinus sylvestris L.) z drzewostanów rębnych
    Comparison of selected physical properties of the juvenile and mature wood of Scots pine [Pinus sylvestris L.] from mature stands
    Autorzy:
    Tomczak, A.
    Jelonek, T.
    Zoń, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009416.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany rebne
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    drewno dojrzale
    drewno mlodociane
    wlasciwosci fizyczne
    gestosc drewna
    gestosc umowna
    kurczliwosc
    juvenile wood
    mature wood
    basic density
    shrinkage
    scots pine
    Opis:
    The paper presents results of a comparative analysis of basic density and shrinkage of juvenile and mature wood of Scots pine (Pinus sylvestris L.). Mature wood turned to exhibit higher density and shrinkage. Differences are dependent on the location of a sample at the stem profile. Properties of juvenile wood exhibit higher variability in comparison to those of mature wood, especially in relation to shrinkage.
    Źródło:
    Sylwan; 2010, 154, 12; 809-817
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wlasciwosci drewna sosny zwyczajnej [Pinus sylvestris L.] na gruntach porolnych w polnocnej Polsce
    Selected properties of wood in Scots pine [Pinus sylvestris L.] growing on post-agricultural land in northern Poland
    Autorzy:
    Jelonek, T.
    Pazdrowski, W.
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/45924.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    grunty porolne
    zalesianie
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    gestosc drewna
    wytrzymalosc na sciskanie wzdluz wlokien
    wzmocnienie desorpcyjne
    Źródło:
    Leśne Prace Badawcze; 2009, 70, 3; 277-286
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gęstość drewna sosny zwyczajnej (Pinus sylvestris L.) jako wskaźnik odporności drzewa na działanie silnych wiatrów
    Density of Scots pine (Pinus sylvestris L.) wood as an indicator of tree resistance to strong winds
    Autorzy:
    Tomczak, A.
    Jelonek, T.
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991495.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    odpornosc na wiatr
    sosna zwyczajna
    Pinus sylvestris
    gestosc drewna
    scots pine
    windthrow
    basic wood density
    Opis:
    We assumed that wood of trees undamaged by wind will be characterized by higher basic density than wood of damaged specimens. It was stated that wood of windthrow had lower basic density, but differences were not statistically significant. Two parts of wood: (compressed and tensioned zones) were analyzed separately. Higher density was found in tensioned zone of windthrow and in compressed zone in control trees. Similar results were obtained in samples of extreme.
    Źródło:
    Sylwan; 2013, 157, 07; 539-545
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utrata masy i zmiany gęstości średniowymiarowego surowca sosnowego pozyskanego i magazynowanego w okresie letnim
    Weight loss and green density changes of Scots pine pulpwood harvested and stored during the summer
    Autorzy:
    Tomczak, A.
    Wesołowski, P.
    Jelonek, T.
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989611.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    lato
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    drewno sredniowymiarowe
    drewno swiezo sciete
    magazynowanie
    utrata masy drewna
    gestosc drewna
    scots pine
    mass of logs
    timber
    freshly−cut trees
    bark
    wood moisture
    Opis:
    The study objectives included: i) determination of the mass and green density of pulpwood (wood+bark) and ii) comparison of the changes in these parameters during 14−day−long storage period. The experiment was conducted between 15 and 28 July 2014 and the material was taken from the 67 year−old Scots pine stand (Tuchola Forest District, northern Poland). Using the Urich method, 30 model trees were selected. After felling and delimbing, logs of 2.5 m length were cut, with diameter at the small end not less than 7 cm outside the bark. In total, 133 logs were harvested (mean diameter inside the bark at the thicker end – 13.1 cm, in the thinner end – 11.4 cm). After diameter measurements were taken, each log was weighed (total over bark volume equaled 4.69 m³, while total weight – 3955 kg). Mass measurement took place daily between 8 and 10 a.m. In Poland, the raw material is not recommended to be stored too long in summer, due to the possibility of its depreciation. Storage time should be as short as possible and not exceed 2 weeks. The mass of the 1 m³ of wood harvested from freshly−cut trees amounted to 844 kg. After 14 days it decreased to 814 kg (–3.5%). Differences were not statistically significant. Because the moisture content has the highest influence on mass, the rain and thereby an increase in the air humidity significantly reduce drying. Mass of 1 m³ of raw material was reduced to the day of rain by 2.9 kg (–0.35%) per day on average. After the occurrence of rainfall, between 10th and 14th day of storage the mean weight loss was 1.3 kg/m³ (–0.16%). The mean weight loss reached 30 kg/m³ in analyzed period. Generally two weeks storage is too short time to obtain a large weight loss. However, in this case of total mass of haulage vehicles together with their cargo may be a few hundred kilos smaller.
    Źródło:
    Sylwan; 2016, 160, 08; 619-626
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jakość drewna sosny zwyczajnej (Pinus sylvestris L.) I. Charakterystyka wybranych cech i właściwości drewna wpływających na jego jakość
    Quality of Scots pine [Pinus sylvestris L.] wood. Part I. Characteristics of selected wood traits and properties affecting its quality
    Autorzy:
    Tomczak, A.
    Pazdrowski, W.
    Jelonek, T.
    Grzywiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012211.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    jakosc
    Pinus sylvestris
    drewno pozne
    drewno sosnowe
    seki
    drewno wczesne
    gestosc drewna
    drewno mlodociane
    sloje przyrostu rocznego
    sosna zwyczajna
    drzewa lesne
    wady drewna
    wood quality
    scots pine
    knots
    wood density
    tree rings
    latewood
    juvenile wood
    Opis:
    The study presents the synthetic characteristic of selected wood tissue traits and properties (knots, tree rings, the proportion of latewood, juvenile wood, wood density, dimensions of anatomical elements, cell wall structure), which play significant role in modifications of wood quality. At individual stage of the raw material–product cycle the term "quality" may be interpreted differently, but characteristics determining it remain unchanged. Quality depends on the natural traits and properties of wood.
    Źródło:
    Sylwan; 2009, 153, 06; 363-372
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości drewna sosny zwyczajnej (Pinus sylvestris L.) pochodzącej z gruntów porolnych
    Properties of wood of Scots pine [Pinus sylvestris L.] growing on former farmlands
    Autorzy:
    Jelonek, T.
    Pazdrowski, W.
    Arasimowicz-Jelonek, M.
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009458.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    grunty porolne
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    jakosc
    gestosc drewna
    wlasciwosci mechaniczne
    wytrzymalosc na sciskanie wzdluz wlokien
    zginanie statyczne
    wzmocnienie desorpcyjne
    scots pine
    wood quality
    basic density
    former farmland
    juvenile wood
    mature wood
    desorption strengthening
    Opis:
    Analyses were conducted on wood from twelve Scots pines from northern Poland, aged 102 to 110 years, growing on former farmland and on forest grounds. The study was an attempt to determine basic density of wood, compressive strength along the grain, bending strength of absolutely dry wood and wood with moisture content above saturation point. Desorption strengthening was determined for analyzed strength properties of wood. Wood properties were determined in terms of juvenile and mature wood zones. Generally pines growing on former farmlands were characterized by wood with higher density and slightly lower strength than pines growing on typical forest soils. Conducted investigations indicate varied structure and properties of wood tissue formed in pines growing on former farmlands, which is different from that of typical forest soils.
    Źródło:
    Sylwan; 2010, 154, 05; 299-311
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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