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 39 for “"populus tremuloides"”.
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Colorado cytospora canker complex on Populus tremuloides Michx.
Cytospora canker is a serious fungal disease affecting aspen in natural and commercial forests as well as urban sites. In Colorado the causal organism responsible for this canker disease is typically reported to be Cytospora chrysosperma (Pers.) Fr. However, a thorough understanding of the species …
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Fungal Degradation Properties of Young Small Diameter Genetically Modified Quaking Aspen (Populus tremuloides)
… properties of young transgenic aspen trees (Populus tremuloides). The first study focused on development of methods of decaying small diameter tree samples. The second and third studies focused on the mass loss differences and cellulose and lignin degradation between trees with different …
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K+-Homöostase und kaliumabhängige Xylogenese in Populus tremula L. x Populus tremuloides Michx
… Aus Holz-Kambium-Bast-Gewebe wurden mit PTK2 (Populus tremula K+ channel 2), KPT1 (K+ channel Populus tremula 1) und PtKUP1 (Populus tremula K+ uptake transporter 1) drei Volllängen putativer Kaliumtransporter isoliert. PTK2 ließ sich anhand der abgeleiteten Aminosäuresequenz der …
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The cost of longevity: loss of sexual function in natural clones of Populus tremuloides
… or lateral roots. The focus of this study was Populus tremuloides, trembling aspen, a dioecious tree that reproduces sexually by seed and asexually through lateral roots. Local forest patches in western populations of Populus tremuloides consisted largely of multiple genotypes. Multi-clonal …
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Species, stand, and regional response to forest damage in southwestern Quebec following the 1998 ice storm
… species, Acer saccharum Marsh., Acer rubrum L., Populus tremuloides Michx., and Betula populifolia Marsh. to ice storm damage was studied in the Northern Hardwood Forest of southwestern Quebec, Canada. The focus of the study was the analysis of tree damage resulting from ice accumulation ranging …
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The effect of hot-pressing parameters on resin penetration and flakeboard layer properties
… of phenol-formaldehyde resin into aspen (<i>Populus tremuloides</i>) and Douglas-fir (<i>Pseudotsuga menziesii</i>) flakes, and the layer properties of yellow poplar (<i>Liriodendron tulipifera</i>) flakeboard were investigated to determine how they were influenced by various pressing …
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The Effects of Forest Management on Birds in the Black Hills of South Dakota
… four structural stages of quaking aspen (Populus tremuloides ), and meadow habitats of the Black Hills, South Dakota during 1992 and 1993. I observed 69 species during this study. Dark - eyed Juncos (Junco hyemalis) were common in all habitats except meadows. The Yellow-rumped Warblers …
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Sexual recruitment of trees following fire in the southern mixedwood boreal forest of Canada
… (L.) Mill., Picea glauca (Moench) Voss and Populus tremuloides Michx., was studied in the mixedwood boreal forest of Saskatchewan, Canada. The main objective of the study was to estimate the recruitment densities of germinants as a function of seedbed type. Field observations indicate that …
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Response of mat conditions and flakeboard properties to steam- injection variables
… in the laboratory scale manufacture of aspen (Populus grandidentata and Populus tremuloides) flakeboard. Two resins, phenol formaldehyde and polymeric MDI, were used. Steam-injection press schedules varied from low steam input to high steam input by adjusting steam pressure, steam time, and the …
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Elk hunting on Turnbull National Wildlife Refuge: impacts on elk movement and aspen regeneration
<p>"In the arid West, quaking aspen (Populus tremuloides) cover less than 10% of the forest landscape, yet support a disproportionate diversity of native plants and animals. When elk (Cervus elaphus) become overabundant, browsing prevents aspen regeneration, reduces survival, and consequently …
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Differential Canopy Leaf Flushing and Site Nitrogen Status Facilitate Invasive Species Establishment in Temperate Deciduous Forest Understories
… understories. Six canopy types were used: <em>Populus tremuloides</em> (quaking aspen), <em>Acer saccharum </em>(sugar maple), <em>Quercus </em>spp./<em>Carya </em>spp. (oak/hickory), <em>Fraxinus americana </em>(white ash), <em>Robinia pseudoacacia</em> (black locust), and <em>Pinus …
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A comparison of Aspen and Pine Communities in the Northern Black Hills
Three study areas, each containing an aspen (Populus tremuloides) community, a pine (Pinus ponderosa) community, and a mixed aspen-pine community, were studied during the summers of 1968, 1969, and 1970. Soil chemistry, plant chemistry, overstory density, understory production, and use by whitetail …
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Geochemical Investigations of Mineral Weathering: Quantifying Weathering Intensity, Silicate versus Carbonate Contributions, and Soil-Plant Interactions
… Juniperus scopulorum), a deciduous tree (Populus tremuloides), three shrubs (Chrysothamus nauseosus, Fallugia paradoxa, Rhus trilobata), and an annual grass (Bouteloua gracilis) and a lichen (Xanthoparmelia lineola). We found that plant 87Sr/86Sr ratios covaried with variations in plant …
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Ecological and taxonomic studies of ectomycorrhizal fungi associated with Aspen
… were an important component of the mycoflora of Populus tremuloides in Montana. Species of the mycorrhizal genus Inocybe, which is not well known in North America, were particularly prevalent in the aspen stands near Butte. Thirteen of the 16 species of Inocybe that occurred with aspen in these …
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A Food Habits Study of Whitetail Deer In The Black Hills
… summer 1967. Summer study was confined to aspen (Populus tremuloides) areas and involved stomach analysis and a pasture study. Fall and winter food habits were determined by stomach analysis only. Associated aspen vegetation was sampled to find a representative site for construction of a 0.7 acre …
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Effects of Litter Production, Biochemistry and Plant Community Composition on Carbon and Nutrient Cycling under Elevated Carbon Dioxide and Tropospheric Ozone.
… effects, leaf litter was collected from aspen (Populus tremuloides Michx) and birch (Betula papyrifera Marsh) communities in 2003 at Aspen Free-Air Carbon Dioxide Enrichment experiment in Rhinelander, WI. A 935 day in situ litter decomposition study was conducted. The results suggested that …
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