The effects of within-species and between-species variation in wood density on the photodegradation depth profiles of sugi (Cryptomeria japonica) and hinoki (Chamaecyparis obtusa) |
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Authors: | Yutaka Kataoka Makoto Kiguchi Takeshi Fujiwara Philip D Evans |
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Institution: | (1) Department of Wood Improvement, Forestry and Forest Products Research Institute, PO Box 16, Tsukuba Norin, Ibaraki 305-8687, Japan;(2) Department of Wood Properties, Forestry and Forest Products Research Institute, Ibaraki 305-8687, Japan;(3) Centre for Advanced Wood Processing, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada |
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Abstract: | Low density wood is more rapidly eroded than denser wood when exposed to the weather, possibly because it is more susceptible
to photodegradation. Fourier transform infrared microscopy was used to examine: (1) the depth of photodegradation in earlywood
and latewood of sugi (Japanese cedar) and earlywood of hinoki (Japanese cypress) exposed for up to 1500 h to artificial sunlight
emitted by a xenon lamp (375 W/m2 within the 300 to 700 nm spectral range); and (2) the relationship between the density of wood tissues and depth of photodegradation.
The depth of photodegradation varied between species (sugi and hinoki) as well as within a growth ring (sugi earlywood and
latewood), and there was an inversely proportional relationship between depth of photodegradation and wood density. These
findings may explain why low density earlywood is more rapidly eroded than latewood during weathering, and more generally,
why there is an inverse relationship between the density of wood species and their rate of erosion during artificial and natural
weathering.
Part of this work was presented at the 54th Annual Meeting of the Japan Wood Research Society, Sapporo, August 2004 |
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Keywords: | Density Depth profile FT-IR Photodegradation Wood |
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