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Barva in odpornost lesa evropskega in ameriškega oreha : diplomsko delo - visokošolski strokovni študij
Smole, Jože (Author), Čufar, Katarina (Mentor) More about this mentor... This link opens in a new window, Pohleven, Franc (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/vs_smole_joze.pdf This link opens in a new window

Abstract
Na vzorcih lesa evropskega in ameriškega oreha (Juglans regia L. in Juglans nigra L.) smo opravili meritve barve s sistemom CIEL*a*b. Z laboratorijskim testom naravne odpornosti in mikroskopsko smo ovrednotili posledice razkroja z glivami: pisano ploskocevko (Trametes versicolor), rjavo tramovko (Gloeophyllum trabeum ) in belo hišno gobo (Poria vaillantii). Rezultati kažejo, da pri evropskem in ameriškem orehu lahko z meritvami svetlosti ločimo beljavo od jedrovine. Z meritvami barve razlikovanje med lesnima vrstama ni mogoče, lahko pa vrsti ločimo lesno anatomsko. Ameriški oreh v lesu vsebuje romboidne kristale in ima heterogeno trakovno tkivo, evropski pa nima kristalov in ima homogene trakove. Testi naravne odpornosti so pokazali, da je evropski oreh manj odporen na delovanje pisane ploskocevke in da sta predela beljave in stržena manj odporna v primerjavi z jedrovino in predelom prog. Pri izpostavitvi rjavi tramovki so rezultati testa primerljivi. Pri izpostavitvi beli hišni gobi se je ameriški oreh izkazal za bolj odpornega od evropskega. Beljava in stržen obeh drevesnih vrst sta manj odporna od jedrovine. Izkazalo se je, da sta predela prog in jedrovine obeh drevesnih vrst bolj odporna kot beljava in stržen, ter da prihaja do razlik v stopnji razkroja pri delovanju različnih gliv. Pod mikroskopom smo na mikroskopskih preparatih lesa prikazali posledice razkroja celičnih sten zaradi delovanja različnih gliv.

Language:Slovenian
Keywords:evropski oreh, ameriški oreh, naravna odpornost, glive
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2010
Publisher:[J. Smole]
Number of pages:VIII, 58 f.
Place:Ljubljana
UDC:630*814.1
COBISS.SI-ID:1870729 Link is opened in a new window
Views:853
Downloads:109
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Secondary language

Language:English
Abstract:
Measurements of wood colour were performed on wood specimens of the European and American walnut (Juglans regia L. and Juglans nigra L.) using the system CIEL*a*b. A laboratory test of natural durability was carried out and the effects of fungal decay of wood were demonstrated microscopically. The fungi used in the experiment were white rot fungi Trametes versicolor and brown rot fungi Gloeophyllum trabeum and Poria vaillantii. The results show that it is possible to distinguish sapwood from heartwood of the European and American walnut through brightness measurements. The 2 species cannot be distinguished using measurements of wood colour; however, it is possible to distinguish them anatomically. American walnut wood contains rhomboid crystals and has heterogeneous ray tissue; European walnut wood does not contain crystals and has homogeneous rays. Tests of natural durability show that the European walnut is less resistant to Trametes versicolor activity and that sapwood and pith are less resistant than heartwood and streaks. At exposure to Gloeophyllum trabeum, the test results for the 2 species were equivalent; moreover, the sapwood and pith areas turned out to be less resistant. At exposure to Poria vaillantii, the American walnut proved to be more resistant than the European walnut. The sapwood and pith of both species are less resistant than heartwood. The results show that the streak area and the heartwood of both species are more resistant than sapwood and pith, and that individual fungi cause different stages of decay. The effects of decay of cell walls due to activity of different fungi were presented with microscopic images.

Keywords:European walnut, American walnut, natural resistance, fungi

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