Depattment of Biology and Ecology, Faculty of Sciences and Mathematics, University of Niš
Doi
Abstract
Conifers, as a response to mechanical stress, such as wind and stem lean, form
reaction wood called compression wood (CW). CW occurs in a range of gradations
from near normal wood (NW) to severe CW (SCW). As the severity of
CW affects the mechanical and chemical properties of wood, and as CW has
limited value in the forest products industry, it is desirable to be able to measure
CW severity. Picea omorika belong to slow-growing conifer species in
which CW typically occurs in a severe form. We developed different morphometric
and non-morphometric methods for estimation of CW severity tested
on wood samples of P. omorika juvenile trees exposed to long term static
bending. This specific review is aimed at presenting P. omorika as one of the
most adaptable spruces, and as a good model for testing of methods for estimation
of compression wood severity. First, we summarize main knowledge
about P. omorika, features of CW, and methods for assessment of wood quality.
Then, we present breifly our recently published methods for estimation
of compression wood severity tested on P. omorika juvenile wood samples.Konifere kao odgovor na mehanički stres (vetar, savijanje) formiraju reakciono
drvo koje se naziva kompresiono drvo (CW). CW se javlja u nizu
gradacija od skoro normalnog drveta (NW) do jako izraženog CW (SCW).
S obzirom da stepen izraženosti osobina CW ima značajan uticaj na
mehaničke i hemijske osobine drveta i da CW ima ograničenu vrednost za
drvnu industriju, poželjno je moći odrediti stepen izraženosti osobina CW
u uzorku. Picea omorika spada u sporo rastuće četinarske vrste kod kojih se
CW tipočno javlja u jako izraženoj formi. Mi smo razvili nekoliko morfometrijskih
i ne-morfometrijskih metoda za procenu izraženosti osobina CW
u uzorku, testiranih na uzorcima drveta juvenilnih stabala P. omorika koja
su bila izložena dugotajnom statičkom savijanju. Ovaj revijski rad ima za
cilj da predstavi Pančićevu omoriku kao jednu od najadaptabilnijih smrča i
kao dobar model za testiranje metoda za procenu izraženosti osobina CW u
uzorku. U prvom delu sumiramo znanja o Pančićevoj omorici, osobinama
CW i metodama za procenu kvaliteta drveta, a u drugom ukratko predstavljamo
naše nedavno objavljene metode za za procenu izraženosti osobina
CW u uzorku, testirane na uzorcima drveta juvenilnih stabala P. omorika
