Vpliv branik hrastovine na naravno odpornost proti glivam razkrojevalkam

diplomsko delo

Blaž Fabčič (Author), Primož Oven (Reviewer), Miha Humar (Mentor)

Abstract

Hrastovino uvrščamo med najbolj trajne slovenske lesne vrste. V literaturi in tudi na osnovi praktičnih izkušenj smo opazili, da naravna odpornost hrastovine močno niha. Do sedaj je večina strokovnjakov naravno odpornost hrastovine povezovala z vsebnostjo ekstraktivov. Dokazali so, da imajo ekstraktivi velik vpliv na naravno odpornost, vendar samo s tem parametrom niso mogli pojasniti razlik glede obnašanja vzorcev. Da bi ugotovili, kako na odpornost hrastovine vpliva širina branik oziroma gostota, smo, v skladu s standardom SIST EN 113, izdelali vzorce iz hrastovih desk različnih širin branik in jih izpostavili 5 vrstam gliv. Vzporednim vzorcem smo določili delež ekstraktivov, dušika, lignina, kemijsko analizo (FTIR) in barvo. Iz gravimetrično določene izgube mase in mikroskopske analize razkrojenih vzorcev lahko sklepamo, da so bili hrastovi vzorci iz ozkih branik bolj dovzetni na glivni razkroj kakor vzorci iz srednje širokih in širokih branik. Odpornost hrastovine s povprečno širino branik 0,77 mm je primerljiva z naravno odpornostjo bukovine. Poleg tega naši rezultati potrjujejo, da je vpliv ekstraktivov na naravno odpornost hrastovine zelo pomemben.

Keywords

hrastovina;širina branik;gostota;lesne glive;razkroj;izguba mase;FTIR;

Data

Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[B. Fabčič]
UDC:	630*841
COBISS:	1659017
Views:	983
Downloads:	280
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of ring-widths on oak-wood natural durability against decay fungi
Secondary abstract:	Oak-wood is considered as one of the most durable Slovenian domestic wood species. There were several reports about natural durability of products made of oak. In the past research on oak-wood durability, the most important factor influencing wood durability was assigned to extractives. It was proved that the extractives had a large influence on natural durability, nevertheless, just this parametre did not suffice to elucidate the differencesregarding the behaviour of samples. To find out if oak-wood durability can also be affected by ring-widths or density, oak-wood specimens were prepared from boards with different ring-widths, and exposed to 5 different fungal species, according to the EN 113 standard procedure. In parallel, extractives, nitrogen, lignin content, chemical properties (FTIR), and colour of the specimens were determined as well. From gravimetrically determined mass losses, and microscopy analysis of decayed specimens, it can be resolved that oak wood specimens with the narrowest rings are more susceptible to fungal decay than specimens made of average or wide ring-widths. Durability of oak-wood with average rings width of 0.77 mm is comparable to durability of beech-wood. Furthermore, our results indicate that influence of extractives on wood durability is important as well.
Secondary keywords:	oak wood;ring-width;density;wood fungi;decay;mass-loss;FTIR;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	XI, 77 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	21406