Between- and within-tree variation in the anatomy and specific gravity of wood in Oregon white oak (Quercus garryana Dougl.) Public Deposited

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  • In order to analyze the variation in wood properties within and between trees of an underutilized tree species, we sampled six Oregon white oak (Quercus garryana Dougl.) trees from an 80-year-old mixed stand of Q. garryana and Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) in the Coast Range of Western Oregon, USA. Fibre length, earlywood vessel diameter, tissue proportions, and specific gravity were measured on samples across the diameter at two heights. Trees had a slight lean (2-12°), so we sampled separately both radii of a diametric strip that ran from the lower to upper side of lean. Variation between trees, between the two heights, and between the lower and upper sides of lean was not significant for most measured wood characteristics. The exceptions were vessel proportion, higher at the upper height, and specific gravity, higher at breast height (P<0.05). There was significant variation (P<0.05) between the youngest juvenile wood (growth rings 2, 4, and 7) and the oldest sampled mature wood (growth rings 32, 39, and 48) in fibre length (1.1 vs. 1.2 mm); earlywood vessel diameter (164 vs. 272 um); proportion of fibre (64 vs. 46%), vessel (12 vs. 27%), and axial parenchyma (10 vs. 14%); and specific gravity (0.83 vs. 0.66). These characteristics showed demarcation ages between juvenile and mature wood of 10-26 years, depending on the characteristic. The ray proportion (about 14%) showed no definite pattern of radial change. The results of this study may be used for estimating wood and fibre quality of ring-porous hardwoods such as this species.
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  • Hua Lei, Michael R. Milota, and Barbara L. Gartner. 1996. Between- and within-tree variation in the anatomy and specific gravity of wood in oregon white oak (Quercus garryana Dougl.). IAWA Journal Vol. 17(4): 445-461.
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  • description.provenance : Approved for entry into archive by Caryn Davis(caryn.davis@oregonstate.edu) on 2010-01-20T00:30:11Z (GMT) No. of bitstreams: 1 96-Lei-OakIAWA.pdf: 980716 bytes, checksum: 2f76e5a74ea304a1e94a292317337aa3 (MD5)
  • description.provenance : Submitted by Alexa Pinckard (pinckara@onid.orst.edu) on 2010-01-19T23:44:16Z No. of bitstreams: 1 96-Lei-OakIAWA.pdf: 980716 bytes, checksum: 2f76e5a74ea304a1e94a292317337aa3 (MD5)
  • description.provenance : Made available in DSpace on 2010-01-20T00:30:11Z (GMT). No. of bitstreams: 1 96-Lei-OakIAWA.pdf: 980716 bytes, checksum: 2f76e5a74ea304a1e94a292317337aa3 (MD5) Previous issue date: 1996

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