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    Wyświetlanie 1-8 z 8
    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:
    Porównanie wad wielkowymiarowego drewna sosnowego w normalizacji krajów Unii Europejskiej
    Comparison of the large-size wood defects in the European Union countries normalization
    Autorzy:
    Malinowski, Z.
    Wieruszewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/986941.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewnictwo
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    drewno okragle
    drewno wielkowymiarowe
    wady drewna
    normalizacja
    normy polskie
    normy europejskie
    standards
    qualitative classification
    round wood
    scots pine
    Opis:
    Scots pine wood is widely used in many branches of the wood industry. The possibility to select the raw material quality according to the specific processing needs corresponding to different uses is related with the issues of the standardisation, which comprises classification based both on the dimensions of processed assortments as well as their defects and traits of anatomical construction. In the last two decades of economic transformations in Poland, there has been increasing importance of the standardisation process because of the trade between the European Union (EU) member−states. EU−membership involved gradual adjustment to the rules of round wood trade, which are applicable in the old EU member−states. Many international certification institutions as well as the Polish Committee for Standardisation were involved in the process of standardisation. The experience of northern and western European countries generated a very complex classification system, which partly matched the national standards. There are differences in the description of Scots pine wood characteristics and defects in the domestic standards and technical conditions concerning this timber trade, which is of key importance to the Polish wood industry.
    Źródło:
    Sylwan; 2017, 161, 10; 795-803
    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:
    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:
    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.) 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
    Tytuł:
    Zmienność gęstości umownej drewna sosny zwyczajnej (Pinus sylvestris L.) w zależności od wybranych czynników
    Variability of conventional wood density of Scots pine (Pinus sylvestris L.) depending on the selected factors
    Autorzy:
    Witkowska, J.
    Lachowicz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/993205.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    gestosc drewna
    gestosc umowna
    czynniki siedliska
    polozenie geograficzne
    typy siedliskowe lasu
    wiek drzewostanu
    gestosc na wysokosci piersnicy
    gestosc w polowie dlugosci grubizny
    gestosc w gornym koncu grubizny
    scots pine
    conventional wood density
    forest habitat type
    poland
    Opis:
    Paper presents analysis of differences in conventional wood density of Scots pine measured at breast height regarding the geographical location of stands, forest habitat type, stand age and associated parameters such as density in the mid−length of the stem, density in the upper end of the stem and diameter at breast height. To investigate the impact of these factors, an analysis of covariance was used in accordance with two models specifically developed for this purpose. We found dependence of conventional wood density on the type of forest habitat and geographical location of the stand. The highest density was detected in dry coniferous forests, while the smallest in fresh mixed coniferous forests. Scots pine wood from Zielona Góra Forest (western Poland) characterised with the highest density, while from the Knyszyn Primeval Forest (eastern Poland)− with the lowest.
    Źródło:
    Sylwan; 2013, 157, 05; 336-347
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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