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    Tytuł:
    Juvenile wood volume and its proportion to stem volume vs. selected biometric features of Scots pine [Pinus sylvestris L.] trees
    Autorzy:
    Pazdrowski, W
    Tomczak, A.
    Kupczyk, G.
    Jelonek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/57743.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    breast height diameter
    tree height
    Scotch pine
    total stem volume
    determination coefficient
    juvenile wood
    Pinus sylvestris
    tree
    wood
    forest site type
    Opis:
    The aim of the study was to determine whether there is a correlation between breast height diameter, tree height and stem total volume of Scots pines, on the one hand, and volume and proportion of juvenile wood, on the other. The investigations comprised pure pine stands of the IInd, IIIrd, IVth and Vth age classes developed in conditions of fresh mixed coniferous forest. A distinct curvilinear correlation was found between volume and proportion of juvenile wood in tree stems and breast height diameter, height and stem total volume. Because of high values of determination coefficients (R2), which characterised the above-mentioned correlations, it seems appropriate to use these regularities to assess the quality of the timber raw material regarding the proportions of its volume and juvenile wood in stems of Scots pine trees.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2005, 74, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical variability of selected macrostructural properties of juvenile wood organization in trunks of Scots pine [Pinus sylvestris L.] trees
    Autorzy:
    Tomczak, A
    Pazdrowski, W.
    Jelonek, T.
    Stypula, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/58813.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Scotch pine
    vertical variability
    annual ring
    plant development
    Pinus sylvestris
    juvenile wood
    tree
    botany
    maturation
    trunk
    late wood proportion
    axial heterogeneity
    Opis:
    The study makes an attempt to analyse the width of annual rings, the width of the latewood zone and the proportion of the latewood within juvenile wood along trunks of Scots pine (Pinus sylvestris L.) trees and to verify the hypothesis about the heterogeneous properties of juvenile wood in a single trunk. It was found that the above-mentioned macrostructural elements of wood structure showed a curvilinear correlation with the height of measurement points along the tree trunk. As the distance from the base of trunk increased, the width of the annual ring and the width of the latewood zone decreased, while the proportion of the latewood increased. These types of changes can affect positively physical and mechanical properties of wood tissue. It can be assumed that there is a mechanism which modifies properties of juvenile wood causing axial diversification of the analysed type of wood tissue. It is probable that axial heterogeneity results in advantageous changes in the mechanics of the tree trunk.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2007, 76, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    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:
    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:
    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:
    Wytrzymałość na ściskanie wzdłuż włókien drewna sosny zwyczajnej uszkodzonej i nieuszkodzonej przez wiatr
    Compressive strength parallel to grain of Scots pine wood of wind-damaged and undamaged trees
    Autorzy:
    Jakubowski, M.
    Jelonek, T.
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/990848.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    uzytkowanie lasu
    drzewostany pokleskowe
    wiatry
    uszkodzenia drzew
    drzewostany sosnowe
    drzewa uszkodzone
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    wytrzymalosc na sciskanie wzdluz wlokien
    wood properties
    strong wind
    scots pine
    wood defects
    Opis:
    Research was carried out in Scots pine (Pinus sylvestris L.) stands damaged by strong wind in six locations in Poland. The aim of this study was to analyse the radial variation of compressive strength parallel to grain in the wind−broken trees and neighbouring survivors. Strength tests were conducted in moisture above saturation fibre point. There were no significant differences in the radial distribution of the compressive strength between the compression side (breakage side) and the tension side (the opposite one). Either there were no significant differences between compression strength of damaged trees and neighbouring standing trees.
    Źródło:
    Sylwan; 2014, 158, 10; 787-794
    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
    Tytuł:
    Jakość drewna sosny zwyczajnej (Pinus sylvestris L.) II. Naturalne warunki (czynniki) produkcji i ich rola w kształtowaniu jakości drewna
    Quality of Scots pine [Pinus sylvestris L.] wood. Part II. Natural conditions [factors] of production and their role in the fluctuations of wood quality
    Autorzy:
    Tomczak, A.
    Pazdrowski, W.
    Jelonek, T.
    Grzywiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009721.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drewno sosnowe
    zmiennosc fenotypowa
    czynniki siedliska
    czynniki genetyczne
    sosna zwyczajna
    lesnictwo
    jakosc
    Pinus sylvestris
    drzewa lesne
    wood quality
    scots pine
    genotype
    phenotype
    natural factors of production
    Opis:
    Wood structure and properties are determined by genetic, environmental and anthropogenic factors. Genetic factors probably play the most significant role, determining wood value and quality. However, also traits resulting in bigger or lesser extent from growth and development conditions or human activity modify the final effect of timber production. The study is based on literature review and presents the problem of wood quality and the role natural production factors play modifying it.
    Źródło:
    Sylwan; 2009, 153, 07; 435-441
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jakość drewna sosny zwyczajnej (Pinus sylvestris L.) III. Wpływ postępowania gospodarczego na jakość drewna
    Wood quality of Scots pine [Pinus sylvestris L.]. Part III. The effect of silviculture on wood quality
    Autorzy:
    Tomczak, A.
    Pazdrowski, W.
    Jelonek, T.
    Grzywiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011748.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drewno sosnowe
    drzewostany sosnowe
    wiezba drzew
    podkrzesywanie drzew
    sosna zwyczajna
    lesnictwo
    jakosc
    ciecia pielegnacyjne
    Pinus sylvestris
    drzewa lesne
    wood quality
    scots pine
    silviculture
    stand density
    improvement felling
    pruning
    Opis:
    The aim of the study was to collect and present in a synthetic way the current state of knowledge on wood quality and factors affecting its fluctuations. Selected research papers presented in this study refer to Scots pine – the most important forest−forming species both in Poland and our part of Europe. Presented relationships between selected wood properties and characteristics of trees on the one hand and methods adopted in the management policy indicate that it is possible to modify wood quality on standing trees. In the future the utilization of these properties in forest economy is probably going to facilitate meeting the growing requirements of the wood market, especially in case of valuable assortments.
    Źródło:
    Sylwan; 2009, 153, 08; 519-527
    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
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