magistrsko delo
Žan Golob (Author), Miha Humar (Reviewer), Boštjan Lesar (Mentor), Viljem Vek (Co-mentor)

Abstract

Rdeči hrast (Quercus rubra L.) samoniklo uspeva le na vzhodu Severne Amerike. V slovenske gozdove je bil prvič zasajen pred dobrim stoletjem. Cilj naše raziskave je bil, da ugotovimo kako je les rdečega hrasta iz slovenskega rastišča odporen na navlaževanje z vodo in glivni razkroj. Vzporedno smo testiranja izvajali na lesu evropskega hrasta (Quercus spp.) in na smrekovini (Picea abies L.). Beljava je neodporna na glivni razkroj, zato smo za vsa testiranja uporabljali le jedrovino izbranih lesnih vrst. Izvedli smo niz raziskav na področju odpornosti lesa na glivni razkroj in navlaževanju z vodo. Poleg tega smo izvedli še anatomske in kemijske analize. Pripravili smo trajne anatomske preparate in na mikroskopski ravni primerjali vpliv zgradbe lesa evropskega hrasta in rdečega hrasta na glivni razkroj. Številne tile v lesu evropskega hrasta predstavljajo bariero, ki otežuje napredovanje glivnih hif, medtem ko so v lesu rdečega hrasta tile redke, je pa zato bolj impregnabilen. Določili smo količino ekstraktivov v lesu, delež celuloze, lignina in hemiceluloz. Z računskim modelom Meyer-Veltrup smo na podlagi faktorja odpornosti lesa na biološki razkroj in faktorja odpornosti lesa proti navlaževanju izračunali relativno življenjsko dobo lesa in čas v katerem pričakujemo začetek razkroja lesa. Rdeči hrast v primerjavi z evropskim hrastom izkazuje skoraj enako odpornost na navlaževanje, medtem ko je slabše odporen na glivni razkroj, saj vsebuje manjšo količino ekstraktivov in je redko otiljen. Raziskava podaja dobre izhodiščne podatke za lažje odločitve pri uporabi in zaščiti lesa rdečega hrasta.

Keywords

rdeči hrast;odpornost lesa;glivni razkroj;navlaževanje;ekstraktivi;anatomija lesa;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [Ž. Golob]
UDC: 630*844.4
COBISS: 127779843 Link will open in a new window
Views: 27
Downloads: 8
Average score: 0 (0 votes)
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Other data

Secondary language: English
Secondary title: Durability and moisture dynamic of red oak wood from Slovenia
Secondary abstract: Red oak (Quercus rubra L.) is native only to eastern North America. It was first planted in Slovenian forests more than a century ago. The objective of the study was to determine the resistance of red oak wood from Slovenian forests to moisture and fungal attack. Testing of red oak wood was conducted in parallel with testing of European oak (Quercus spp.) and Norway spruce (Picea abies L.) wood. The sapwood is not resistant to fungal decay, and thus only heartwood from selected wood species was used for all tests. We conducted a series of studies on the resistance of wood to fungal decay and wetting. In addition, anatomical and chemical analyses were performed. We made permanent anatomical preparations and compared the influence of the wood structure of European oak and red oak on fungal decay at the microscopic level. The numerous tyloses in the wood of European oak provide a barrier to the progression of fungal hyphae, whereas tyloses in red oak wood are rare and therefore easier to treat. The amount of extractives in the wood, and the percentages of cellulose, lignin and hemicelluloses were determined. Using the Meyer-Veltrup model, we calculated the relative resistance dose of the wood and the time within which the wood is expected to begin to decay based on the wood's inherent resistance to biological deterioration and wettability. Red oak shows nearly the same wetting performance compared to European oak, but is less resistant to fungal attack because it contains lower levels of extractives and tyloses. The study provides good baseline data to facilitate decisions on the use and protection of red oak wood.
Secondary keywords: red oak;wood durability;fungal decay;humidification;extractives;wood anatomy;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: 1 spletni vir (1 datoteka PDF (X, 75 str.))
ID: 16921423