RELATIONSHIP BETWEEN WOOD EXTRACTIVES AND WOOD DECAY

Abstract

The durability of following five wood species: Zelkova carpinifolia, Ulmus glabra, Pterocarya fraxinifolia, Carpinus betulus and Acer laetum were studied. Wood blocks exposed to Trametes versicolor(a white rot fungus) under laboratory conditions according to DIN52176 standard. After 16 weeks incubation the heart wood of Z. carpinifolia showed 2.19% reduction in weight loss, while U glabra with 41.69%, C. betulus with 45.64%, A. laetum with 53.03% and P. Fraxinifolia with 43.08% weight losses were very decayed. For finding relationship between amount of wood decay and wood extractives a regression was carried out. The percentages of extractive materials by using T20403 standard were 13.84% in Z. carpinifolia, 4.51% in U. glabra, 2.74% in C. betulus, 3.88% in A. laetum, and 4.11% in P. fraxinifolia. Finally there was a negative correlation between rate of decay and amount of wood there was expect P. fraxinifolia. for all wood species extractives.

Keywords

• WEIGHT LOSS
• EXTRACTIVES
• WOOD DURABILITY
• DECAY
• TRAMETES VERSICOLOR
• AZAD
• MALAG
• AFRA
• VAN AND MAMRAZ