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Patterns of tree microhabitats across a gradient of managed to old-growth conditions : a case study from beech dominated forests of South-Eastern Slovenia
Kristina Sever, Thomas Andrew Nagel, 2019

Abstract: An inventory of tree microhabitats was done in two unmanaged forests (Kobile and Ravna gora forest reserves) and one managed beech forest in SE Slovenia. The purpose of this study was to determine the influence of forest management, natural disturbances, and tree characteristics on microhabitat patterns. Forest structure and microhabitats were recorded in systematically placed plots (500 m2 in size) across each area. In total, we inventoried 849 trees on 54 plots and 1833 tree microhabitats. The results showed that forest management had no significant influence on the abundance of microhabitats per tree, but there were differences regarding microhabitat type between managed and unmanaged sites. There were substantially more microhabitats related to standing dead and live habitat trees in unmanaged forest (e.g. woodpecker cavities, insect galleries and bore holes, branch holes, dead branches and fruiting bodies of fungi), whereas in managed forests there were more tree microhabitats related to management (e.g. exposed heartwood, coarse bark, and epiphytic plants). The results also indicate that disturbance, tree diameter, vitality, and species influence the density, diversity, and occurrence of tree microhabitats.
Keywords: forest management, biodiversity, tree microhabitats, beech forests, old-growth, veteran tree, natural disturbance, dead wood
DiRROS - Published: 08.07.2019; Views: 3494; Downloads: 1861
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Influence of microwave heating in wood preservation on traditional surface coatings
Franc Pohleven, Marko Petrič, Matjaž Pavlič, Martin Klinc, 2017

Abstract: Microwaves are very effective at wood pest eradication. However, elevated temperatures may pose a risk of damaging surface coatings used on cultural and historical artefacts. Therefore, we monitored changes in patterns of the original paint taken from such objects along with newly prepared coatings. We evaluated visual, mechanical, and chemical modifications of coatings when exposed to microwaves (750W, 2.4GHz), at 60°C or 80°C for 10 min. Whether old or new, only water-based coatings have proven to be resistant to elevated temperatures and no damage was observed at 80°C. Blisters have formed on layers of new oil paints and natural resins due to insufficiently cured film. Temperatures above 80°C may cause melting of coniferous wood resin and thus transport of resin to the surface; on the other hand, temperatures up to 60°C are completely harmless. Mechanical and chemical changes of coatings exposed to microwaves were not observed, but the studies showed that colour and gloss exhibited minor changes.
Keywords: wood, wood coatings, wood protection, microwaves, heating
DiRROS - Published: 03.07.2017; Views: 3589; Downloads: 1876
.pdf Fulltext (2,63 MB)

Influence of drying temperature on properties of wood surfaces
Milan Šernek, 2002

Abstract: This article deals with modifications of wood surface properties induced by different drying temperatures. The aim of the study was chemical and physical characterization of a wood surface concerning low and high temperature exposure. Additionally, the correlation between the chemical composition of a wood surface and its wetting capacity were investigated. X-ray photoelectron spectroscopy and contact angle measurements were conducted. Two wood species, yellow poplar (Liriodendron tulipifera) and southern pine (Pinus taeda) were studied. The results showed that the percentage of carbon increased with drying temperature, and consequently, the percentage of oxygen decreased. The samples exposed to high drying temperatures indicated a higher content of extractives on the wood surface. These samples exhibited the highest contact angle and the lowest wettability
Keywords: površina lesa, sušenje, kontaktni kot, rentgenska fotoelektronska spektroskopija, omočitev, ekstraktivne snovi, wood surface, drying, contact angle, XPS, wettability, extractives
DiRROS - Published: 12.07.2017; Views: 2692; Downloads: 961
.pdf Fulltext (932,44 KB)

Model reševanja konfliktov - primer lesnega podjetja na Hrvaškem
Josip Faletar, Jože Kropivšek, 2016

Abstract: Pri poslovanju se, kakor tudi pri vseh ostalih odnosih, pojavljajo nasprotna mišljenja in konflikti. Ravnanje s konflikti je ena pomembnejših nalog managementa, ki močno vpliva na učinkovitost in uspešnost podjetij. V raziskavi, ki je predmet tega članka, smo preučevali fenomen konfliktov v velikem lesnopredelovalnem podjetju na Hrvaškem. Podatke smo pridobivali s strukturiranim anketnim vprašalnikom. Ugotavljali smo značilnosti obstoječega modela ravnanja s konflikti v tem podjetju. Podrobneje smo preučevali odnose med zaposlenimi, kako pogosto se pojavljajo konflikti in kako se vpleteni odzivajo nanje. Čeprav v preučevanem podjetju formalno ne obstaja model ravnanja s konflikti, pa lahko na osnovi te raziskave ta model dovolj natančno identificiramo in dokažemo njegove skupne značilnosti. Rezultati so pokazali, da so odnosi med zaposlenimi v preučevanem podjetju dobri ter, da je način odzivanja na konflikte pozitivno naravnan. Najpogostejši vzrok za konflikte je slabši pretok informacij med zaposlenimi, kar kaže na izrazito potrebo po izboljšanju komunikacijskega kanala, predvsem po razgovorih in različnih drugih vrstah sestankov. Zato je to tudi eden izmed pomembnejših elementov predloga modela za ravnanje s konflikti v preučevanem podjetju.
Keywords: konflikti, reševanje konfilktov, lesno podjetje, modeli, Hrvaška, poslovanje, voditeljstvo, conflicts, leadership, wood industry, model, Croatia
DiRROS - Published: 12.07.2017; Views: 3535; Downloads: 1558
.pdf Fulltext (1,56 MB)

Promotion activities of wood industry in Slovenia and in Croatia
Marko Dušak, Denis Jelačić, Maja Moro, Andreja Pirc Barčić, Leon Oblak, 2016

Abstract: Wood industry is among the most important industrial sectors in Slovenia and Croatia. In both countries, wood sector is a part of the national strategy plans and one of the industrial branches considered national economy boosters. But media coverage of wood industry and furniture manufacturing in Slovenia, as well as in Croatia, is far behind the promotion enjoyed by other industrial branches. This paper will give the current situation in promotional activities of wood sector in Slovenian and Croatian media and demonstrate the existing differences among given countries. Also, it will present some ideas on improving this situation according to media share of other highly profiled industrial branches in some southeastern European countries.
Keywords: wood industry, promotion activities, media coverege, promotion investments
DiRROS - Published: 12.07.2017; Views: 2920; Downloads: 1400
.pdf Fulltext (693,89 KB)

Differentiation of last formed tracheids in wood of silver firs (Abies alba) having various cambial productivity
Jožica Gričar, Aleš Straže, Katarina Čufar, 2003

Abstract: To examine the state of differentiation of the last tracheids formed in wood and the duration of cambial activity, samples of wood and cambium were taken from mature silver fir (Abies alba) trees having various cambial productivity.Semi-thin cross-sections of wood sampled in July and October, 1999, were stained with toluidine blue and observed under a light microscope. In July, three different phases of current annual xylem growth ring formation were found, as a result of various cambial tree productivity. In October, the cell divisions in the cambium were completed in all investigated trees, while the process of differentiation was not entirely completed in trees with a more productive cambium. The number of undifferentiated tracheids was higher in trees having a more productive cambium. In these trees, the cambial activity and the differentiation ended later. In declining trees, the number of cells produced by the cambium was lower and the duration of cambial activity was shorter.
Keywords: navadna jelka, Abies alba, les, traheide, kambijeva aktivnost, diferenciacija, wood, silver fir, tracheids, cambial activity, differentiation
DiRROS - Published: 12.07.2017; Views: 2646; Downloads: 1015
.pdf Fulltext (119,73 KB)

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