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The variability of wood density and compression strength of Norway spruce
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SYSNO ASEP 0485298 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title The variability of wood density and compression strength of Norway spruce Author(s) Horáček, Petr (UEK-B) RID, ORCID, SAI
Fajstavr, Marek (UEK-B) SAI, ORCID, RID
Stojanović, Marko (UEK-B) ORCID, RID, SAISource Title Beskydy - ISSN 1803-2451
Roč. 10, 1-2 (2017), s. 17-26Number of pages 9 s. Language eng - English Country CZ - Czech Republic Keywords Norway spruce ; wood density ; compression strength ; variability Subject RIV GK - Forestry OECD category Forestry R&D Projects LO1415 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UEK-B - RVO:86652079 Annotation This study relates to the variability of wood density and compression strength parallel to grain within the stem of spruce trees (Picea abies /L./ Karst.). The sample tree originated from the Giant Mountains and was an adult autochtonous mountain spruce. The properties were analysed for wood that formed between 1850 and 1990 along (1) the north-south oriented radius and along (2) the stem height on test specimens with the following dimensions: 20×20×30 mm, prepared from logs taken from the stem base at distances of 2, 4, 6, 10, 14, 20, 22, 24 and 26 m. In individual sections, the properties of the samples oriented in the north or south direction did not differ, while the effect of different ages on the properties showed statistically significant differences at each orientation (p < 0.05). Along the radius, the properties showed an increasing trend in tree-rings that developed between 1850 and 1940 with a slight decrease in the following years. The coefficient of variation in various decades was 1–7% (wood density) and 3–15% (wood compression strength). Along the stem height, the properties gradually increased to a height of 20 m, while the increase in values was more pronounced in the 22–26 m interval. The variability of the wood properties along the stem height corresponded to the variability of the properties along the stem radius. A linear dependence between wood strength and density was demonstrated. Compared to what had been previously written, wood density showed a greater impact, probably due to the biomechanical optimization of the stem with regard to mechanical wind and snow loads in the mountains. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2019
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