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 129 for “"tree growth"”.
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Hierarchical Bayesian Analysis of Peruvian Tree Growth Rates
… order to analyze massive data sets of Peruvian tree growth data. The study is important in finding connections between different parameters (such as the tree's classification or elevation) and rate at which the tree grows. We combine the Bayesian paradigm with the hierarchical structure of our …
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The Influence of Heavy Metals upon Tree Growth in South Wales Forests
… to examine the effects by heavy metals upon tree growth.<br/><br/>Water culture techniques were used to determine the upper critical tissue concentrations for cadmium, copper, lead, nickel and zinc ions: these being the lowest concentrations at which shoot yields were affected. Concentrations …
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Development of Urban Tree Growth Models Based on Site and Soil Characteristics
Trees provide numerous benefits crucial to urban environments, yet poor growing conditions often prevent trees from reaching their genetic potential for growth, longevity, and ecosystem function. To overcome these limitations, greater understanding of tree growth in the urban environment is needed. …
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Efficacy and Effect of Tree Stabilization Systems On Landscape Tree Growth and Establishment
… anchoring are used to prevent post-transplant tree destabilization in the landscape, but little scientific evidence exists to support this practice. This experiment tested the efficacy of three generic tree stabilization systems (TSS) and their effect on tree growth and establishment. In spring …
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Effects of paper mill sludge on tree growth and competition in young red pine plantations
… application did not show a significant volume growth response to increasing sludge rates. Nonetheless, some biologically significant trends did occur following the first growing season, namely, diameter growth in the younger plantation decreased by 27%, 36% and 39% with increasing rates of …
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Tree Growth and Carbon Balance in a Temperate Forest Exposed to Elevated Carbon Dioxide for Eight Years
… scale of forests and long-lived nature of trees. I conducted this research in a Pinus taeda forest exposed to elevated [CO2] using Free Air Carbon dioxide Enrichment technology for 8 years. Growth was stimulated in the dominant canopy species in every year of the experiment with no evidence …
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Development of soil lead and tree-ring methods for characterizing atmospheric deposition gradients and subsequent tree growth responses
… also examined the effects of acid deposition on tree growth by sampling three tree species (Picea rubens, Liriodendron tulipifera, and Betula alleghaniensis) along spatial gradients of deposition within the eastern United States. By studying tree-rings along the gradient, I was able to examine …
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Long-Term Effects of Thinning and Prescribed Fire on Tree Growth and Bark Beetle Demography in a Jeffrey Pine Stand
… implemented with cut-to-length and whole-tree harvesting systems followed by underburning were evaluated for their effects on long-term individual tree and stand level growth responses as well as bark beetle demography in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) …
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Long-term effects of prescribed fire on vegetation structure, dynamics, and tree growth in red pine (Pinus resinosa Ait.) forests in north central Minnesota.
… season and frequency in affecting individual tree and stand-level structural responses. Burning treatments were applied on 0.4 ha compartments arranged in a randomized block design with four blocks. Burning treatments crossed fire season (dormant, summer) and frequency (annual, biennial, and …
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Evaluation of Topsoil Substitutes for Restoration of Appalachian Hardwoods on Strip Mined Land
… and planting grasses and early-successional trees. This results in a greatly altered ecosystem compared to the native forest that was there prior to mining. The reclaimed land is usually degraded economically and environmentally because mine soils are usually less productive than the native …
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Assessing the impact of greentree reservoir water management on red oak growth and anatomy in the lower Mississippi Alluvial Valley
… To preserve migratory waterfowl habitat, greentree reservoirs (GTRs) were established, providing artificial flooding during the fall and winter. Red oak species within GTRs provide vital resources, such as mast and habitat for wildlife, and make up an important part of waterfowl conservation. …
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The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology
… communities, resulting in changes that affect tree health and productivity. Many apple growers apply synthetic nitrogen fertilizers to improve fruit yield and quality. In excess of tree requirements, nitrogen fertilizers may reduce crop yield and quality, as well as contribute to water …
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Hydroclimatic Variability in North-central Mongolia as Inferred from Tree Rings
… at fine resolutions. Therefore, networks of tree-ring chronologies are a valuable means of assessing regional and local variability in hydroclimate while placing recent moisture trends in a historical context. Tree-ring data are particularly useful in Mongolia, where instrumental records are …
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Electrical breakdown and structural characterization in synthetic resins using optical techniques
… physical processes occurring during electrical tree initiation and tree growth in the pin-plane geometry. Light scattering measurements have been used to determine the origins and magnitudes of the microstructure content (MC) of the Epoxy (CT200) and unsaturated polyester rains, and in …
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Rehabilitation of Severely Compacted Urban Soil to Improve Tree Establishment and Growth
Land development restricts tree growth by damaging soil structure and removing organic matter. Mechanical loosening and organic amendment may improve soil physical properties and tree establishment and growth. Effects of typical post-construction practice and improved methods of soil restoration on …
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Historical growth rates and changing climatic sensitivity of boreal conifers
… with the expression of relatively long-timescale growth forcing in tree-ring chronologies. The operation of different standardisation techniques, used in dendroclimatology to remove internal, non-climate related growth trends in measured series of ring-widths, is explored with an emphasis on the …
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