scholarly journals Anisotropy of transversal swelling of Serbian spruce wood (Picea omorika (Pancic) Purkyně)

2018 ◽  
pp. 119-136
Author(s):  
Danijela Petrovic ◽  
Zdravko Popovic ◽  
Nebojsa Todorovic ◽  
Vojislav Dukic
Keyword(s):  
Regression Analysis ◽  
Growth Rings ◽  
Spruce Wood ◽  
Late Wood ◽  
Picea Omorika ◽  
Natural Stands ◽  
Serbian Spruce

The paper presents the results of analysis of anisotropy of transverse swelling of the Serbian spruce wood. The analysis included six trees that come from plantations and nine trees from natural stands of Serbian spruce, and a total of 3098 samples were tested. The results show a change in transversal anisotropy at the height of the tree, as well as its change in radius. The dependence of this property on the growth rings width, the participation of late wood and the density of wood was determined by regression analysis.

scholarly journals Compression strength perpendicular to grain of Serbian spruce (Picea omorika (Pancic) purkyně) wood from plantations and natural stands

2017 ◽  
pp. 171-188
Author(s):  
Danijela Petrovic ◽  
Zdravko Popovic ◽  
Nebojsa Todorovic
Keyword(s):  
Mechanical Properties ◽  
Regression Analysis ◽  
Tangential Direction ◽  
Annual Rings ◽  
Spruce Wood ◽  
Limit Strength ◽  
Picea Omorika ◽  
Natural Stands ◽  
Serbian Spruce ◽  
Conditional Limit

This paper presents the results of testing the compression of Serbian spruce wood from plantations and natural stands. Compression perpendicular to grain in radial and tangential direction was tested. A dilatation of 1% was taken for a conditional boundary dilatation, and the appropriate strength for the conditional limit strength was taken. Six trees from plantations and nine trees from natural stands were analyzed. In total, 309 samples were tested. The regression analysis examined the dependence of these mechanical properties on the width of the annual rings, the percentage of late wood and wood density.

scholarly journals MOR and MOE of Serbian Spruce (Picea omorika Pančić/Purkyně) Wood from Natural Stands

2021 ◽  
Vol 72 (2) ◽  
pp. 193-200
Author(s):  
Danijela Petrović ◽  
Vojislav Dukić Dukić ◽  
Zdravko Popović ◽  
Nebojša Todorović
Keyword(s):  
Modulus Of Elasticity ◽  
Ring Width ◽  
Modulus Of Rupture ◽  
Bending Stress ◽  
Annual Ring Width ◽  
Spruce Wood ◽  
Picea Omorika ◽  
Natural Stands ◽  
Serbian Spruce ◽  
Proportionality Limit

The paper presents the results of testing the bending stress of Serbian spruce wood from natural stands. In testing the samples, in addition to the modulus of rupture, the bending stress at the proportionality limit, the ratio between the stress at the proportionality limit and the modulus of rupture as well as the modulus of elasticity of wood were determined. The study included nine trees from natural stands, and a total of 261 samples were tested. Regression analysis determined the dependences of these mechanical properties on the annual ring width, the proportion of late wood and wood density, as well as the dependence of the modulus of elasticity on the modulus of rupture.

scholarly journals Crown structure of Picea omorika trees in the plantation

2012 ◽  
Vol 64 (2) ◽  
pp. 605-611 ◽  
Author(s):  
M. Krstic ◽  
N. Stavretovic ◽  
V. Isajev ◽  
I. Bjelanovic
Keyword(s):  
Tree Height ◽  
Tree Crown ◽  
Crown Length ◽  
Crown Structure ◽  
Parabolic Function ◽  
Picea Omorika ◽  
Serbian Spruce ◽  
The Relationship ◽  
Total Tree ◽  
Stand Conditions

The study was carried out in Serbian spruce (Picea omorika Panc/Purkyn?) plantations in the western Serbia. The paper presents results of the analysis of crown development. The following elements were analyzed: total tree height, height of the crown base, absolute and relative crown length, maximal crown diameter, coefficient of crown spreading and degree of crown girth. We discuss approaches to the modeling of tree crown growth and development, growing under favorable environmental and stand conditions, without anomalies in development. In order to establish the relationship between analyzed factors, regression analyses were applied. Data fitting was by the analytic method, by the implementation of Prodan?s functions of growth, linear and parabolic function. Received models can be used for the simulation of various growth and developing processes in forest.

scholarly journals The significance of compression wood in restoration of the leader in Pinus sihestris L. damaged by moose (Alces alces). II. Structure of growth rings in regenerating stems in relation to juvenile wood formation

2015 ◽  
Vol 40 (2) ◽  
pp. 315-340 ◽  
Author(s):  
B. A. Molski
Keyword(s):  
Tree Ring ◽  
Tree Rings ◽  
Compression Wood ◽  
Juvenile Wood ◽  
Alces Alces ◽  
Wood Formation ◽  
Ring Structure ◽  
Growth Rings ◽  
Late Wood ◽  
Wood Compression

The corewood of pine ds very prone to compression wood formation, this changing the whole pattern of the tree ring structure and the siz.es of early and late wood. Compression wood always increases the formation of late wood at the expense of early wood. Tree rings with compression wood are generally wider than those without it, but there occur also tree rings wihout compression wood wider than those in which it is present, formed in the same year and in the same tree.

Variability of antioxidant enzyme activity and isoenzyme profile in needles of Serbian spruce (Picea omorika (Panč.) Purkinye)

2007 ◽  
Vol 35 (5) ◽  
pp. 263-273 ◽  
Author(s):  
Jelena Bogdanović ◽  
Nenad Milosavić ◽  
Radivoje Prodanović ◽  
Tanja Dučić ◽  
Ksenija Radotić
Keyword(s):  
Enzyme Activity ◽  
Antioxidant Enzyme ◽  
Antioxidant Enzyme Activity ◽  
Picea Omorika ◽  
Serbian Spruce

scholarly journals Fluorescence-Detected Linear Dichroism of Wood Cell Walls in Juvenile Serbian Spruce: Estimation of Compression Wood Severity

2016 ◽  
Vol 22 (2) ◽  
pp. 361-367 ◽  
Author(s):  
Aleksandar Savić ◽  
Aleksandra Mitrović ◽  
Lloyd Donaldson ◽  
Jasna Simonović Radosavljević ◽  
Jelena Bogdanović Pristov ◽  
...  
Keyword(s):  
Cross Sections ◽  
Cell Walls ◽  
Compression Wood ◽  
Linear Dichroism ◽  
Normal Wood ◽  
Qualitative Comparison ◽  
Cellulose Fibril ◽  
Cellulose Fibrils ◽  
Picea Omorika ◽  
Serbian Spruce

AbstractFluorescence-detected linear dichroism (FDLD) microscopy provides observation of structural order in a microscopic sample and its expression in numerical terms, enabling both quantitative and qualitative comparison among different samples. We applied FDLD microscopy to compare the distribution and alignment of cellulose fibrils in cell walls of compression wood (CW) and normal wood (NW) on stem cross-sections of juvenile Picea omorika trees. Our data indicate a decrease in cellulose fibril order in CW compared with NW. Radial and tangential walls differ considerably in both NW and CW. In radial walls, cellulose fibril order shows a gradual decrease from NW to severe CW, in line with the increase in CW severity. This indicates that FDLD analysis of cellulose fibril order in radial cell walls is a valuable method for estimation of CW severity.

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