Author(s):
1. Danijela Petrović, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Zdravko Popović, University of Belgrade-Faculty of Forestry, , Serbia
3. Vojislav Dukić, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Nebojša Todorović, University of Belgrade-Faculty of Forestry, , Serbia

Abstract:
Serbian spruce (Picea omorika Pancic / Purkyně) is a tertiary relict and endemic of the eastern part of Bosnia and Herzegovina and the western part of Serbia. As the natural stands of Serbian spruce are protected by law, the focus should be on the establishment of plantations on larger areas where the technological properties of wood could be affected. The bending strength (MOR) and the modulus of elasticity (MOE) of Serbian spruce wood from plantations were studied in this paper. Six trees were analyzed. Three trees come from the Serbian spruce plantation that is located near Banja Luka and belongs to SJC "Industrijske plantaže ". The average age of this plantation is 40 years. There are also three trees that have been taken from plantation which is located near Srebrenica and belongs to FE "Drina" - Srebrenica. Their average age is 31 years. The research material was taken from three heights along the technically valuable part of the stem, starting at the height of 1.3 m. The average MOR for all six trees is 59.89 MPa, with a coefficient of variation of 21%, while the average value of MOE is 7 289.81 MPa with a coefficient of variation of 22.36%. Tests have shown that there is a difference between MOR and MOE at different heights of the trunk. Regression analysis has shown that there is correlation between these mechanical properties and growth rings width, share of late wood and wood density. There is a positive linear correlation between MOR and MOE.

Key words:
Serbian spruce, ,bending strength (MOR),modulus of elasticity (MOE),growth ring width,wood density,plantations

Thematic field:
Wood industry

Date of abstract submission:
15.09.2017.

Conference:
Šumarska nauka u funkciji održivog razvoja šumarstva
25 godina šumarstva Republike Srpske