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Identifying site characteristics that explain variation in Douglas-fir site productivity and stem form

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dc.contributor.advisor Howe, Glenn
dc.creator Magalska, Lauren E.
dc.date.accessioned 2011-09-27T18:02:31Z
dc.date.available 2011-09-27T18:02:31Z
dc.date.copyright 2011-09-16
dc.date.issued 2011-09-16
dc.identifier.uri http://hdl.handle.net/1957/23609
dc.description Graduation date: 2012 en_US
dc.description.abstract Foresters care about site productivity and stem quality in Douglas-fir plantations for many reasons. The profitability of forest land and the economic returns on silvicultural investments are directly related to site productivity. Thus, understanding the relationships among Douglas-fir productivity, stem form and site characteristics is important economically. My objective was to identify the specific site characteristics that explained variation in Douglas-fir productivity and stem form throughout western Oregon and Washington by using progeny tests that substantially reduced the confounding effects of genotype by environment interaction. These assessments were undertaken to advance our understanding of near-term climate change effects on Douglas-fir productivity and stem form. The site characteristics I focused on include climate, soils and topography. Measures of site productivity and stem form were explained using correlation, random forest, and linear regression analyses. The results of these analytical methods were summarized as total importance scores. The consistency of important site characteristics identified by the analytical methods and the consistency of important site characteristics for explaining variability in different productivity measures were assessed using Spearman rank correlations. The results of this study provide new direction and insight for future research on understanding and modeling the effects of site characteristics on tree growth and form. It may be reasonable to focus future research on summer drought, cold season temperatures and precipitation interactions with soil properties, particularly available water capacity when examining site productivity. Additionally, examining genotype by environment interactions at the family level may provide insight to the driving site characteristics for stem forking, ramicorn branching and sinuosity. en_US
dc.language.iso en_US en_US
dc.relation Forest Explorer en_US
dc.subject Douglas-fir en_US
dc.subject productivity en_US
dc.subject stem form en_US
dc.subject site characteristics en_US
dc.subject.lcsh Forest productivity -- Oregon, Western en_US
dc.subject.lcsh Forest productivity -- Washington (State), Western en_US
dc.subject.lcsh Douglas fir -- Oregon, Western -- Growth en_US
dc.subject.lcsh Douglas fir -- Washington (State), Western -- Growth en_US
dc.subject.lcsh Forest site quality -- Oregon, Western en_US
dc.subject.lcsh Forest site quality -- Washington (State), Western en_US
dc.subject.lcsh Stems (Botany) — Oregon, Western -- Morphology en_US
dc.subject.lcsh Stems (Botany) — Washington (State), Western -- Morphology en_US
dc.title Identifying site characteristics that explain variation in Douglas-fir site productivity and stem form en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Forest Science en_US
dc.degree.level Master's en_US
dc.degree.discipline Forestry en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Maguire, Doug
dc.contributor.committeemember Holub, Scott
dc.contributor.committeemember Stone, Jeff
dc.contributor.committeemember Rose, Robin
dc.description.peerreview no en_us

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