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Changes in impact bending strength, weight and alkali solubility following fungal attack on birch wood

Henningsson, Björn (1967). Changes in impact bending strength, weight and alkali solubility following fungal attack on birch wood. Technical Report. Stockholm: Predecessors to SLU > Royal School of Forestry, Sveriges lantbruksuniversitet. Studia forestalia Suecica ; 41
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Abstract

Specimens of birch sapwood were decayed according to the soil jar method. Twelve different fungi commonly found in birch wood were used as test organisms. Every week after the inoculation, the moisture content, the weight loss and the impact bending strength were investigated. Samples with the same incubation time were ground up, and their solubility in 1 % NaOH was calculated. During the course of decay, the moisture content increased more rapidly in samples decayed by brown rot fungi than in samples decayed by white rot fungi. After an incubation time of seven days when, in many cases, the weight loss was negligible, there was already a substantial loss in strength. For high weight losses, the samples decayed by brown rot fungi had lost more of their strength than those decayed by white rot fungi. For low weight losses, however, there seemed to be little difference in the reduction in strength between samples decayed by white rot fungi and samples decayed by brown rot fungi. The alkali solubility of the samples decayed by brown rot fungi increased steeply during the course of decay, unlike that of the samples decayed by white rot fungi, the solubility of which increased only slightly. The possible cause of the reduction in impact bending strength resulting from fungal attack on wood is discussed. The hypothesis is presented that the dissolution of the chemical and physical linkages between lignin and carbohydrates is the cause of at least the early reduction in impact bending strength.

Authors/Creators:Henningsson, Björn
Title:Changes in impact bending strength, weight and alkali solubility following fungal attack on birch wood
Series/Journal:Studia forestalia Suecica (0039-3150)
Year of publishing :1967
Number:41
Number of Pages:21
Place of Publication:Stockholm
Publisher:Skogshögskolan
ISSN:0039-3150
Language:English
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > NATURAL SCIENCES > Biology > Organism biology > Microbiology
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Product science > Wood fibre and forest products
Keywords:birch , fungi, pulpwood, alkali solubility, strength, weight
URN:NBN:urn:nbn:se:slu:epsilon-9-157
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-9-157
ID Code:5867
Department:Predecessors to SLU > Royal School of Forestry
Deposited By: Skogsbiblioteket Umeå
Deposited On:15 Mar 2011 00:00
Metadata Last Modified:16 Dec 2015 14:44

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