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Gewählte Master / Diploma Thesis:

Yvonne Herbers (2006): Farbänderung von Erlenholz durch hygrothermische Behandlung und Pilzbefall.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 103. UB BOKU obvsg

Data Source: ZID Abstracts
This thesis deals with the color variability of alder wood The wood’s natural light appearance is subject to uneven color changes during kiln drying. Furthermore this tree species tends to be frequently attacked by microorganisms, which can cause several kinds of discolorations. A series of kiln drying tests examined the color-changes due to the drying process’s temperature, humidity and wood moisture. Independent of this test series, the effects of the provenance of the wood and storage time were analyzed. Fungus infection as a possible cause of the streaky discolorations was investigated via Shigometry (measurement of electric resistance). Subsequent optical microscopy was used to examine differences between discolored and non-discolored areas at the cellular level. Temperature and the moisture of wood were found to be parameters which exert a considerable influence on the color-formation of alder wood during the kiln drying process. Relative humidity however has only a minor influence on color shifts. Based on the Shigometric and microscopic research at hand the supposed causal connection between streaky color-patterns in alder wood and fungus infection was further confirmed.

Beurteilende(r): Wimmer Rupert

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