- Tytuł:
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Właściwości fizyczne i mechaniczne oraz budowa anatomiczna drewna jałowca pospolitego (Juniperus communis L.)
Physical and mechanical properties and anatomy of common juniper (Juniperus communis L.) wood - Autorzy:
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Kozakiewicz, P.
Życzkowski, W. - Tematy:
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nauka o drewnie
Juniperus communis
budowa drewna
budowa anatomiczna
właściwości mechanicze
leśnictwo
jałowiec pospolity
drewno jałowcowe
właściwości fizyczne
common juniper
wood anatomy
physical and mechanical properties - Pokaż więcej
- Wydawca:
- Polskie Towarzystwo Leśne
- Powiązania:
- https://bibliotekanauki.pl/articles/973557.pdf Link otwiera się w nowym oknie
- Opis:
- The common juniper is a well−known arboreal plant with wide range of the occurrence and small habitat requirements. It is the most numerous coniferous shrub in Poland, sometimes taking shape of small tree. There is no sufficient data about the anatomy as well as physical and mechanical properties of common juniper wood in available literature. Hence, the objectives of this paper were to supplement the knowledge about the properties and anatomy of the juniper wood. The nine trunks of the common juniper of column shape were harvested to this investigation. These small trees with height up to 5 meters were 34−38 years−old. They grew on postagricultural area on brown podzol (common sand) in Łomża Forest District (E Poland). It is a sunny area on the rim of subcontinental fresh coniferous forest – one of the typical and favourable habitat for the common juniper in Poland. We analysed the microstructural elements of common juniper wood. The main component of the microstructure are short (average length 2.5 mm) and thin−walled tracheids (wall thickness from 2.4 µm in traheids of spring wood to 4.2 µm in tracheids of summer wood). Domination of this type of microstructural elements has influence on physical and mechanical properties of wood. Investigated wood characterised with low coefficient of shrinkage. The volumetric coefficient of shrinkage is 10.2%, so the wood has not tendency to crack and distort. The common juniper wood has slightly higher density (562 kg/m3 in air−dry state) than Scots pine wood and similar hardness, shear strength (91 MPa), static bending strength (85 MPa) and compression strength parallel to grain (49 MPa). The latter is directly proportional to density of the wood. The other mechanical properties of common juniper wood: modulus of elasticity and tension strength parallel to grain are significantly lower than for Scots pine wood. It is the influence of wood microstructure, not rectilinear arrangement of cell in wood and significant content of juvenile wood. Considering these aspects and modes dimensions of common juniper raw material, the potential use are different including small wooden articles especially kitchen accessories.
- Dostawca treści:
- Biblioteka Nauki
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