INVESTIGATION ON THE PROPERTIES OF PEDUNCULATE OAK WOOD AFFECTED BY OAK DECLINE
The combination of damaging agents, as biotic and abiotic factors, has as effect the deterioration in the appearance of the foliage of affected trees and then, progressive death of branches. Large numbers of pedunculate oak (Quercus robur) and sessile oak (Quercus petraea) trees are declining in t...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Editura Universitatii Transilvania din Brasov
2014-12-01
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| Series: | Pro Ligno |
| Subjects: | |
| Online Access: | http://proligno.ro/ro/articles/2014/4/lica.pdf |
| Summary: | The combination of damaging agents, as biotic and abiotic factors, has as effect the deterioration in the
appearance of the foliage of affected trees and then, progressive death of branches. Large numbers of
pedunculate oak (Quercus robur) and sessile oak (Quercus petraea) trees are declining in the Central
Romania. Depending on the deterioration of the foliage and of the branches, five grades of infestation levels of
oak trees were determined. The objective of this study was to investigate the quality of wood obtained from
those infested trees by analysing the cellulose and lignin content, physical properties such as moisture
content, density, shrinkage from fibre saturation moisture content, permeability of wood to water, and
mechanical properties, such as MOE, MOR for static stresses, tensile strength perpendicular to the grains,
shearing strength and Janka hardness perpendicular to the grains. The more representative samples of trees
affected by oak decline for the five grades of infestation levels of trees were randomly selected and harvested.
They were cut into logs and then sampled for the chemical, physical and mechanical testing. The results of this
study showed that the poor quality of wood resulted from the logs affected by oak decline at the final stage
(five grade of infestation level) could not be used for furniture and other wooden products manufacturing. |
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| ISSN: | 1841-4737 2069-7430 |