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Influence of fungal decay by different basidiomycetes on the structural integrity of Norway spruce wood

Einfluss des pilzlichen Holzabbaus durch verschiedene Basidiomyceten auf die strukturelle Integrität von Fichtenholz

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Abstract

The potential influence of diverse decay patterns caused by different brown rot causing basidiomycetes on the structural integrity of wood was investigated. Therefore, decayed Norway spruce (Picea abies Karst.) specimens representing a wide range of mass loss, caused by four different brown-rot fungi and one white-rot fungus, were applied to a high-energy multiple impact (HEMI)-test series. The relationship between the resistance to impact milling (RIM) and the mass loss by fungal decay could be subdivided into three areas: 1. Prior to measurable mass loss, a strength reduction was detectable due to the depolymerisation of wood cell wall components. 2. Between 0 and 25–30% mass loss, RIM decreased with increasing mass loss. 3. Above 30% mass loss, RIM increased again due to gluing effects of the fungal mycelium. The influence of the different brown rot fungi on the structural integrity of the wood differed slightly, but partly significantly.

Zusammenfassung

Es wurde der mögliche Einfluss unterschiedlicher Abbaumuster durch verschiedene Braunfäule verursachende Basidiomyceten auf die strukturelle Integrität von Holz untersucht. Hierzu wurden Fichten-Prüfkörper (Picea abies Karst.), die von vier verschiedenen Braunfäulepilzen und einem Weißfäulepilz unterschiedlich stark abgebaut worden waren, einer Reihe von multiplen Schlagprüfungen (HEMI-Tests) zugeführt. Die Abhängigkeit des Widerstandes gegen diese Schlagbeanspruchung (RIM) und dem durch den pilzlichen Holzabbau verursachten Masseverlust ließ sich in drei Bereiche unterteilen: 1. Bevor ein messbarer Masseverlust auftrat, war eine Festigkeitsreduzierung feststellbar, hervorgerufen durch die Depolymerisation von Zellwandbestandteilen. 2. Zwischen 0 und 25–30% Masseverlust nahm die RIM mit steigendem Masseverlust ab. 3. Oberhalb 30% Masseverlust stieg die RIM wieder an, was auf Verklebungseffekte durch das Pilzmycel zurückzuführen war. Leichte, aber teilweise signifikante, Unterschiede ergaben sich für den Einfluss der verschiedenen Braunfäulepilze auf die Verminderung der strukturellen Integrität des Holzes.

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Authors and Affiliations

  1. Institute of Vocational Sciences in the Building Trade, Leibniz University Hannover, Herrenhäuser Str. 8, 30419, Hannover, Germany

    C. Brischke & C. R. Welzbacher

  2. Tarnowitzer Weg 7, 22049, Hamburg, Germany

    T. Huckfeldt

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  1. C. Brischke
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  2. C. R. Welzbacher
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  3. T. Huckfeldt
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Correspondence to C. Brischke.

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Brischke, C., Welzbacher, C.R. & Huckfeldt, T. Influence of fungal decay by different basidiomycetes on the structural integrity of Norway spruce wood . Holz Roh Werkst 66, 433–438 (2008). https://doi.org/10.1007/s00107-008-0257-1

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