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Overstory density and disturbance impacts on the resilience of coniferous forests of western Oregon

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dc.contributor.advisor Puettmann, Klaus
dc.creator Neill, Andrew R. (Andrew Rhodes)
dc.date.accessioned 2012-04-17T17:14:07Z
dc.date.available 2012-04-17T17:14:07Z
dc.date.copyright 2012-03-09
dc.date.issued 2012-03-09
dc.identifier.uri http://hdl.handle.net/1957/28768
dc.description Graduation date: 2012 en_US
dc.description.abstract A trait based approach was used to assess impacts of overstory density and thinning on understory vegetation components related to wildlife habitat. The relationship between overstory basal area and understory vegetation for species grouped by traits, such as production of flowers, fleshy-fruit and palatable leaves, was characterized in thinned and unthinned stands at seven Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forests in western Oregon six years following harvests. The ranges of overstory densities within thinned and unthinned stands represent gradients of resource availability and thinning disturbance. Lower overstory densities and thinnings were associated with improved ecosystem functions, specifically the provision of wildlife habitat, as evident by higher cover of flowering and fleshy-fruit and palatable leaf producing species. Greater cover of drought, fire and heat tolerant species in low density stands and after thinnings suggested that these ecosystem functions are more likely to be maintained under climate change conditions, indicating higher resilience. The response of specific functions and response types reflect the traits characteristic for each species group and the impact of these traits on sensitivity to resource availability and disturbances. Thus, the correlation between grouping criteria and the main gradients created by management activities can provide an indication of the expected vegetation response, and therefore the impact of management practices on resilience. en_US
dc.language.iso en_US en_US
dc.relation Forest Explorer en_US
dc.subject Resilience en_US
dc.subject Plant functional traits en_US
dc.subject Plant response traits en_US
dc.subject Thinning en_US
dc.subject Understory vegetation en_US
dc.subject Overstory density en_US
dc.subject Wildlife habitat en_US
dc.subject Climate change en_US
dc.subject.lcsh Forest resilience -- Oregon, Western en_US
dc.subject.lcsh Ecological disturbances -- Oregon, Western en_US
dc.subject.lcsh Forest thinning -- Environmental aspects -- Oregon, Western en_US
dc.subject.lcsh Douglas fir -- Thinning -- Environmental aspects -- Oregon, Western en_US
dc.subject.lcsh Habitat (Ecology) -- Modification -- Oregon, Western en_US
dc.subject.lcsh Understory plants -- Effect of forest management on -- Oregon, Western en_US
dc.subject.lcsh Forest canopies -- Effect of forest management on -- Oregon, Western en_US
dc.title Overstory density and disturbance impacts on the resilience of coniferous forests of western Oregon 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 Anderson, Paul
dc.contributor.committeemember Santelmann, Mary
dc.contributor.committeemember Gregory, Stan
dc.description.peerreview no en_us


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