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 22 for “"oak trees"”.
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Detection of the Oak Wilt Pathogen in Sapwood of Northern Oak Species Using PCR Technology
Early and accurate diagnosis of oak wilt, caused by Ceratocystis fagacearum, is important when disease control action is planned. When laboratory diagnosis is needed, standard isolation protocols that are used rely on high quality samples and require up to 14 days for incubation. New methods, …
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Suction Cup Lysimeter Method for Extracting Pine Bark Substrate Solution
… bark substrate and Quercus phellos L. (willow oak) trees. Volumes extracted were somewhat erratic and not strongly dependent upon centibars of vacuum or extraction time. Lysimeters immersed in water demonstrated that variability was not due to individual lysimeters, but to the coarse nature of …
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Reciprocal Transplant and Machine Learning Study of Oak Mistletoe on Three Host Oak Species in Santa Margarita, California
<p>At Santa Margarita Ranch, California, oak mistletoe (Phoradendron villosum) parasitizes valley oak and blue oak but cannot be found growing on coast live oak despite its abundance and ability to parasitize coast live oak in other areas. It seems as though this species of mistletoe is …
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Analysis and Conservation of Native Forests at Kessler Mountain Fayetteville, Arkansas
… cores were collected from select overstory trees. The overstory of the post oak (Quercus stellata) site (Site A) was dominated by post oak and northern red oak (Quercus rubra). The understory was dominated by northern red oak and black locust (Robnia pseudoacacia). The oldest post oak trees …
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Acorn Contribution to Mammalian Energetics
… carolinenis), and fox squirrels (S. niger). Oak trees (genus (Quercus) produce variable amounts of acorn mast each autumn. Variation in acorn crop yields has been shown to affect reproductive success, population size, body condition, and survival of deer and granivorous rodents. Conversely, …
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Claiborne Avenue in the Treme: re claiming neutral ground
… of the Treme, lined by a large grove of old oak trees. The I-10 brought blight to the area. Nevertheless, neighborhood residents have kept their culture alive underneath the freeway bridge. It continues to be a ritualized space, in spite of the oppressive nature of the massive concrete …
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Biological studies of shiitake logs and associated mycoflora in the Virginia highlands
… considerable diminution of the fruiting life of oak logs, due primarily to Ascomycetous, competing, wood-rotting, contaminating "weed fungi" that either invade the logs after trees are felled or are present in tree tissues before felling. We surveyed several shiitake farms, and, although the …
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Using Remote Sensing and Biogeographic Modeling to Understand the Oak Savannas of the Sheyenne National Grassland, North Dakota, USA
<p>Oak savannas are valuable and complex ecosystems that provide multiple ecosystem goods and services, including grazing for livestock, watershed regulation, and recreation. These ecosystems of the woodland-prairie ecoregion of the Midwestern United States are, however, in danger of disappearing. …
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Growth hormones and their relationship to seed dormancy in Quercus
Northern red oak (Q. rubra L.) seeds were dormant and required 10 weeks of moist, cold stratification before a large percentage of the seeds would germinate. White oak (Q. alba L.) seeds were not dormant and germinated immediately upon falling from the mother tree. A transfer of mass from the …
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Optimising oak woodland establishment into UK upland pastures in the context of climate change; and the role of oak woodland in soil hydrological recovery for natural flood management
… and the impact of upland ‘Atlantic’ oak (Quercus robur, Quercus petraea) woodland establishment on the recovery of soils for natural flood management (NFM). The soil moisture, livestock grazing and dispersal constraints for potential oak woodland expansion in upland pastures are …
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Hypersensitive Response in Live Oak: Characterization and Efficacy Against a Host of Specific Gall-Forming Wasp
… the leaves of Quercus fusiformis (plateau live oak) in response to oviposition by the host specific gall-forming wasp Belonocnema treatae to assess whether apparent HR functions in plateau live oak as a plant defense, and if so, to estimate its importance. To do this I examined the probability …
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Negative Effects Of ComMycorrhizal Networks And Roots On Upland Oak Seedlings In Open-Canopy Woodlands And Closed-Canopy Forests
After extensive logging and fire suppression many oak dominated woodlands or forests are in danger of being replaced by a mix of non-pyrogenic and shade tolerant tree species that benefit from fire suppression. Successful advanced regeneration by oaks in forests and woodlands depends both on the …
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Habitat selection by the elegant trogon (Trogon elegans) at multiple scales.
… of trogons were primarily located in sycamore trees in riparian areas. Successful nests could be discriminated from unsuccessful nests on the basis of three variables. Adult trogons used trees that were mostly dead for several behaviors besides nesting, and males foraged from sycamore and oak …
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Ozone effects on red oak root dynamics
… problem of scaling seedling results to mature trees, and increase our level of understanding of ozone effects on below ground processes, an ozone fumigation experiment on northern red oak seedlings and mature trees was conducted. It was hypothesized that carbon reallocation to replace foliage …
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Chemical interactions between rainfall and northern red oak (Quercus rubra l.) foliage
… simulated acid rain solutions and northern red oak (Ouercus rubra L.) leaves of trees growing in fertile, limestone-derived soil and less fertile, sandstone/shale-derived soil. Leaves harvested from trees growing on the fertile site had greater concentrations of total N, P, K, Ca, and Mn but …
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Terrestrial laser scanning to characterise three-dimensional foliage and woody material distributions in trees
… cloud data of small broadleaf and needle-leaf trees in the laboratory, three single isolated oak trees with different structure and appearance and a full forest stand plot were used for foliage/wood classification in this research. The spectral and spatial classifications were compared to …
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Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… carbon cycling of a Mediterranean savanna-type oak woodland. Special focus was laid on the seasonal understory impact on net ecosystem fluxes, soil water distribution and tree-understory interactions. Moreover, the impact of altered precipitation pattern and drought intensity on ecosystem …
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The postglacial sedimentology of Devils Lake, North Dakota
… low-water stage at 500 years before present when oak trees grew on the dry surface sediment of East stump Lake. The level subsequently rose until 1800 A.D., declined to a low-water stage in 1940 A. D., and has been rising inter mittently from that time to the present. Salinity data indicate that …
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Information on emergent insect associated tree diseases including epidemiological studies of drippy blight disease of oak and thousand cankers disease of walnut
… cankers have become injurious to hardwood trees in communities across the urban corridor of Colorado. In order to better understand these disease complexes, studies were initiated to identify the causal agents, symptomology, and epidemiology of drippy blight disease as well as determine if …
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Model-based analysis of climate change impacts on the productivity of oak-pine forests in Brandenburg
… information across Germany) with focus on oak-pine forests in the federal state of Brandenburg. The overarching question is: how are the oak-pine forests affected by climate change described by a variety of climate scenarios. I answer this question by using a model based analysis of tree …
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