Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 144 for “"Conifer"”.
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Forest Densification Over 85 Years in a Sierra Nevada Mixed-Conifer Forest Decreases Conifer Regeneration and Limits Survival
… of fire suppression in Sierra Nevada mixed conifer forests has decreased conifer regeneration and survival. Increases in overstory biomass and decreases in canopy heterogeneity, along with decreases in shrub cover in the understory, has created unfavorable establishment site conditions for …
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Hydrologic Response to Conifer Removal from an Encroached Mountain Meadow
… and anthropogenic stressors. The encroachment of conifers beyond forest meadow ecotones is largely responsible for the decline of meadow habitat throughout the past century. Currently, there is little research that quantifies the hydrologic response to removal of conifers encroaching meadows in …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
… fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus ponderosae) has expanded from lower …
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Application of Randomized Branch Sampling to Conifer Trees: Estimating Crown Biomass
… crown structures, which are a common trait of conifer species, are examined in this thesis. The applications of several RBS schemes are examined within the context of sampling to estimate green crown biomass. The way branches are aggregated into groups for sampling along the main stem is the …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
… fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus ponderosae) has expanded from lower …
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Application of Randomized Branch Sampling to Conifer Trees: Estimating Crown Biomass
… crown structures, which are a common trait of conifer species, are examined in this thesis. The applications of several RBS schemes are examined within the context of sampling to estimate green crown biomass. The way branches are aggregated into groups for sampling along the main stem is the …
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The impact of conifer plantation forestry on the ecology of peatland lakes
… afforestation of their catchments by exotic conifers. Plantation forestry can potentially lead to the increased input of substances including hydrogen ions (H+), plants nutrients, dissolved organic carbon (DOC), heavy metals and sediment. The aims of this study were to investigate the effect …
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Development of in vitro regeneration and gene transfer systems for conifer species
In vitro shoot establishment and proliferation of Sequoia sempervirens Endl. stem segments on a Wolter and Skoog (WS) medium supplemented with 15 $\mu$M zeatin was found to be optimum for shoot proliferation. Using in vitro-grown needles of S. sempervirens, shoot organogenesis and somatic …
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Characterizing Crown Struture of Three Interior Northwest Conifer Species Using Terrestrial Laser Scanning
Emerging interests in wildland fire behavior and risk, bioenergy utilization, carbon sequestration, and wildlife conservation increasingly rely on accurate assessments of the amount and location of biomass within the dominant plants on the landscape, often at finer scales than traditional methods …
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Characterizing Crown Struture of Three Interior Northwest Conifer Species Using Terrestrial Laser Scanning
Emerging interests in wildland fire behavior and risk, bioenergy utilization, carbon sequestration, and wildlife conservation increasingly rely on accurate assessments of the amount and location of biomass within the dominant plants on the landscape, often at finer scales than traditional methods …
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Hydrologic Response to Conifer Removal and Upslope Harvest in an Encroached Montane Meadow
… change, over grazing, and fire suppression, conifer encroachment into meadows has accelerated. In some western regions, nearly half of all meadow habitat has been loss due to conifer encroachment. Restoration of these hydrologic systems requires tree removal. Many studies exist that address …
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Forests in a changing world: conifer leaf traits, community shifts, and climate change adaptation
… work that addresses these knowledge gaps in the coniferous forests of the Pacific Northwest. In chapter 1, I examined the variation and covariation of leaf traits of conifer communities across a climatic gradient. I found that the contribution of species turnover to community-level trait values …
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Commodifying the Conifer: The Rise of the Christmas Tree Industry in the United States
<p>Christmas trees are culturally significant symbol of Christmas and embedded within American culture. This dissertation uses the Christmas tree as an object to make historical connections to cultural, environmental, and economic changes. By connecting the meanings endowed to the Christmas tree, I …
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Vegetation Responses to Prescribed Burning in a Mixed-conifer Woodland, Cuyamaca Rancho State Park, California
<p>This study reports the results of light intensity prescribed burning on the vegetation of 3 jeffrey pine-black oak woodland sites in Cuyamaca Rancho State Park, California. The 1.2 ha, 85 ha, and 6 ha burn plots were measured for tree and shrub density and basal area 6 months, 1% years, and 2 …
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Mortality Assessment of Redwood and Mixed Conifer Forest Types in Santa Cruz County Following Wildfire
<p>On August 12, 2009, the Lockheed Fire ignited the west slope of the Santa Cruz Mountains burning approximately 7,819 acres. Foresters and other land managers were left with challenging decisions on how to evaluate tree mortality. Big Creek Lumber Company, California Polytechnic State University, …
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Effects of pretreatment tree dominance and conifer removal treatments on plant succession in sagebrush communities
… communities, the expansion and infilling of conifers decreases perennial vegetation cover and density, and lowers ecosystem resilience and resistance of the shrub-grass dominated state. Successional trajectories following disturbance are highly dependent upon residual species abundance, …
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