Simulating Wood Properties in the Context of a Growth and Yield Model for Planted Douglas-fir Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zk51vk97q

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  • Forest growth and yield models are critical to supporting decision making in forestry, but often lack considerations for wood properties. The feasibility of simulating wood properties in the context of a Douglas-fir individual tree growth and yield model was evaluated. This assessment explored the effect of predicted sapwood width, stem taper, branch size and juvenile wood proportion on recovery of utility poles and sawn lumber. Results from the assessment indicated wood properties can be simulated in the context of growth and yield modeling systems with biologically reasonable results. The same assessment indicated recovery of wood products may be overestimated in the absence of penalties for stem defects. Two critical Douglas-fir wood attributes, knot geometry and wood density, were targeted for modeling after the feasibility analysis. A model for Douglas-fir knot pith curvature was developed based on predicted branch angle and growth ring position over time. Based on the predicted knot pith curvature, knot geometry could be implied from branch radius predicted at the stem surface. Medical computed tomography was identified as one way to rapidly and efficiently estimate Douglas-fir wood density from the proxy of X-ray attenuation. In support of deploying this technology, the effect of wood moisture content and other scanner settings on the relationship of X-ray attenuation and wood density was modeled. Results indicated that X-ray attenuation explains most of the variation in predicting wood density, but moisture content and other scanner settings have a small but significant effect. A number of knowledge gaps should be resolved to sufficiently and robustly simulate wood properties in the context of Douglas-fir growth and yield simulation. Models for sawing simulation and for addressing deficits in existing wood properties models should be an important focus for future research in this field.
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting per students request. ~Julie on 2015-09-21T21:33:02Z (GMT)
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  • description.provenance : Submitted by Nathaniel Osborne (osbornna@oregonstate.edu) on 2015-09-21T21:01:33Z No. of bitstreams: 2 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) OsborneNathanielL2015.pdf: 3839935 bytes, checksum: 0ee12b184ba44498fd8474d4b553df66 (MD5)
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Had to reject your submission for the following reasons - 1) Your ScholarsArchive@OSU submission has been rejected because you attached a CC0 or Public Domain License to your work. These licenses mean that you have "dedicated the work to the public domain by waiving all of your rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. Others can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission." We strongly suggest that you don't attach either of these licenses. We're assuming you probably meant to add a Creative Commons license to your work so that others could use it, but you intended to retain your copyrights. Please re-submit* your work and choose "Creative Commons License" from the License Type drop down box. You'll then be asked two questions about how you want people to use your work. You can also choose "No Creative Commons License". 2) Abstract page - move the Abstract approved to appear after the title. Current it's at the end. 3) Title page - remove the underline under the title. Capitalize the first letter of each main word. On the bottom change Commencement Fall 2015 to read - Commencement June 2016 4) Approval page - second signature line needs to be changed to - Head of the Department of Forest, Engineering, Resources, and Management. Everything else looks good. Once revised, log back into ScholarsArchive and go to the upload page. Replace the attached file with the revised file and resubmit. Thanks, Julie on 2015-09-21T16:39:01Z (GMT)

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