The effect of tree slenderness on wood properties in Scots pine. Part I: Basic density and compression strength parallel to grain
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2016, Vol 96, Issue 1
Abstract
The effect of tree slenderness on wood properties in Scots pine. Part I: Density and compression strength parallel to grain. The aim of this study was analyse the variability in basic density (Qbd) and compression strength parallel to grain of the wood in pine trunks (Rc). We put forward the hypothesis that the density and strength of the wood will be greater in more slender trunks, and that the variability in the properties in slender trunks will be smaller. The study was carried out in mature pine stands, located in north-western Poland. A selection was made of 14 model trees with similar diameter at breast height and similar length of crown. The mean values of HDR were 74 for the shorter trees (S74), and 87 for the taller trees (S87). The wood density of the trees with lower slenderness ratio (S74) was 421 kg/m3 , and that of the trees with the higher ratio (S87) was 439 kg/m3 . Also the compression strength parallel to grain for the trees in the S87 group was higher, at 24.2 MPa (compared with 22.6 MPa for the S74 group). Analysis of variance and multiple comparisons showed that there exist statistically significant differences between the means for trees with different slenderness ratio (HDR) and between the means obtained for samples taken from different parts of the trunk (SN). Generally Qbd and Rc exhibited smaller variability in the trunks of trees with higher HDR. Keywords:
Authors and Affiliations
ARKADIUSZ TOMCZAK, TOMASZ JELONEK, MARCIN JAKUBOWSKI, WITOLD GRZYWIŃSKI, JAROSŁAW SZABAN
Keywords
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