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Browsing Theses, Dissertations and Student Research Papers (Forest Ecosystems and Society & Forest Science) by Title

Browsing Theses, Dissertations and Student Research Papers (Forest Ecosystems and Society & Forest Science) by Title

Now showing items 25-44 of 61

Fire severity and vegetation response to fire in riparian areas of the Biscuit and B&B Complex Fires, Oregon

Halofsky, Jessica E. (2007-07-16)

Fire is the dominant disturbance process in western U.S. forests, and although effects of fire in upland forests are relatively well-studied, there is little information about fire effects on riparian forests, critical a ...
Forest vegetation and fuel dynamics following stand-replacing wildfire, re-burn, and postfire management in the Siskiyou Mountains, Oregon

Donato, Daniel C. (2008-04-11)

Following high-severity fire, forest succession may take alternate pathways depending on the pattern of the fire and any secondary disturbances during early stand development, with lasting consequences for ecosystem fu ...
Functional decreases in hydraulic and mechanical properties of field-grown transgenic poplar trees caused by modification of the lignin synthesis pathway through downregulation of the 4-coumarate:coenzyme A ligase gene

Voelker, Steven L. (2009-05-22)

Society uses massive quantities of wood fiber in production of paper, and demand for fiber is projected to increase further as production of biofuels from fermentation of plant cellulosic materials increases. Because the ...
Growth, morphology, and in vitro development of transgenic poplars with RNAi-inhibited PtDDM1-1/2 gene expression

Zhu, Ruoqing (2011-09)

Epigenetic mechanisms are important for control of plant development, and may play a particularly important role in trees given their long life cycles and distinctive and stable tissue types. To help understand the role ...
Height-related trends in structure and function of Douglas-fir foliage

Woodruff, David R. (2008-07-16)

This dissertation investigated the impacts of tree height upon a range of physiological and structural characteristics of Douglas-fir foliage; relationships between structural and functional trends with height; and compe ...
Identifying site characteristics that explain variation in Douglas-fir site productivity and stem form

Magalska, Lauren E. (2011-09-16)

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 p ...
Impact of exotic Ponderosa pine (Pinus ponderosa Doug. ex Laws.) plantations on water resources in northwestern Patagonia, Argentina.

Licata, Julian A. (2007-12-20)

Exotic ponderosa pine (Pinus ponderosa Doug. ex Lawson) plantations are being planted within the natural distribution area of cordilleran cypress (Austrocedrus chilensis (D.Don) Pic. Ser. et Bizzarri) in Patagonia, Argen ...
Impacts of post-fire salvage logging on soil chemistry, physical properties and bacterial community composition in a mixed-conifer forest in central Oregon

Jennings, Tara Nicolle (2008-12-09)

Land managers, scientists, and the interested public are confronted with uncertainty about the impacts of salvage logging on soil productivity. In recent years, stand-replacing wildfires in the western United States have ...
Independent effects of habitat loss and fragmentation on pollination : tropical forest fragmentation alters hummingbird movements and pollination dynamics

Hadley, Adam S. (2012-08-27)

A growing body of work reveals that animal-mediated pollination is negatively affected by anthropogenic disturbance. Landscape-scale disturbance results in two often inter-related processes: (1) habitat loss, and (2) dis ...
Influences of salvage logging on forest birds after fire in the eastern Cascades, Oregon

Cahall, Rebecca E. (2007-07-11)

Previous research examining the influences of post-fire salvage logging on abundances of birds has focused primarily on the response of cavity-nesting species. There is limited research in regard to the impact of salva ...
Inter-relationships of vegetation, hydrology and micro-climate in a young, Douglas-fir forest

Barnard, Holly Rene (2009-06-17)

The links between forests, streamflow, and climate are poorly understood. Despite hundreds of studies over the past 60 years, fundamental questions of forests' effects on the hydrologic cycle remain unanswered. The hyd ...
Mapping mortality following a long-term drought in a pinyon-juniper ecosystem in Arizona and New Mexico using Landsat data

Kirschbaum, Alan A. (2008-06-13)

Protracted drought in the southwest U.S. has had significant impacts on the region’s keystone ecosystem, the pinyon-juniper (PJ) woodlands. Drought conditions in 9 of the last 10 years, exacerbated by extreme drought i ...
The methodology, implementation,and analysis of the isotopic composition of soil respired CO₂ in forest ecological research

Kayler, Zachary Eric (2009-04-06)

Soils are the largest terrestrial pool of carbon, therefore it is critical to understand what controls soil carbon efflux to the atmosphere in light of current climate uncertainty. The primary efflux of carbon from soi ...
Mixed-conifer forests of central Oregon : structure, composition, history of establishment, and growth

Merschel, Andrew G. (2012-12-14)

The structure and composition of mixed-conifer forest (MCF) in central Oregon has been altered by fire exclusion and logging. The resulting increased density, spatial contagion, and loss of fire resistant trees decrease ...
Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests

van Huysen, Tiffany L. (2009-04-13)

Litter nutrient dynamics contribute significantly to biogeochemical cycling in forest ecosystems. These dynamics may be influenced by site attributes, litter nutrient concentrations, and soil nutrient availability eithe ...
Nitrogen dynamics across silvicultural canopy gaps in young forests of western Oregon

Thiel, Aaron L. (2008-04-23)

Silvicultural canopy gaps are emerging as an alternative management tool to accelerate development of complex forest structure in young, even-aged forests of the Pacific Northwest. I investigated patterns of nitrogen (N) ...
Non-linear nitrogen dynamics and calcium depletion along a temperate forest soil nitrogen gradient

Sinkhorn, Emily R. (2007-10-01)

Understanding how N availability influences base cation stores is critical for long-term ecosystem sustainability. Indices of nitrogen (N) availability and the distribution of nutrients in plant biomass, soil, and soil w ...
On the estimation and application of spatial and temporal autocorrelation in headwater streams

Som, Nicholas A. (2009-09-02)

This collection of three manuscripts serves to improve methods for collecting, interpreting, and utilizing autocorrelated data from headwater stream networks. Each stream network is comprised of linear segments. These ...
Overstory density and disturbance impacts on the resilience of coniferous forests of western Oregon

Neill, Andrew R. (Andrew Rhodes) (2012-03-09)

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 ...
Patterns of crown damage within a large wildfire in the Klamath-Siskiyou bioregion

Thompson, Jonathan R. (2008-07-21)

The 2002 Biscuit Fire burned through more than 200,000 ha of mixed conifer/ evergreen hardwood forests in southwestern Oregon and northwestern California. The remarkable size of the fire and the diversity of conditions ...