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 73 for “"Conifers"”.
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Historical growth rates and changing climatic sensitivity of boreal conifers
This thesis is concerned 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 …
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Persistence potential of Great Basin high-elevation conifers under novel climates and disturbance regimes
Forest persistence under global change will depend upon the capacity of species to persist in situ by tolerating water and temperature stress, rapidly adjust to novel conditions or migrate to track ecological niches. Contemporary climate change outpaces the adaptive capacity of long-lived, …
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The winds of change: A study of post-glacial dispersal in pacific-northwest conifers
"Anthropogenic climate change has caused shifts in the abundances and geographic distributions of many organisms. Given the estimated rates of climate change in the coming decades, many plant species may be unable to migrate or adapt in time, thereby increasing their risk of extinction. The history …
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Estimating and Modeling Transpiration of a Mountain Meadow Encroached by Conifers Using Sap Flow Measurements
… and evaluated transpiration of encroached conifers in a mountain meadow using sap flow prior to restoration by tree removal. We report results of lodgepole pine transpiration estimates for an approximate 1-year period and an evaluation of key environmental variables influencing water use …
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The Water Table and Soil Moisture Response Following the Removal of Conifers from an Encroached Meadow
… encroachment. To combat this issue, encroaching conifers can be removed in an attempt to increase meadow habitat and function. While multiple studies have assessed changes in soil structure and vegetation composition, few studies directly investigate changes in hydrology following meadow conifer …
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The Water Table, Soil Moisture and Evapotranspiration Conditions Following the Removal of Conifers from Two Encroached Meadows
… of this study is to determine if the removal of conifers from an encroached meadow has an effect on depth to the groundwater table (WTD) and soil moisture content (SMC), and to investigate the accuracy and potential usefulness of evapotranspiration (ET) calculation methodologies for montane …
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Growth and physiology of deciduous shade trees and conifers in response to fertilizer and media in pot-in-pot production systems for northern climates
Thesis (M.S.)--Michigan State University. Department of Horticulture, 2008
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Nest-site selection by Sharp-shinned Hawks in Kentucky
… edges and in areas with denser stands of taller conifers and denser understory. All nests were in stands of young (~25-50 years), even-aged conifers about 18 to 25 m in height, with the dense cover provided by the conifers likely providing protection from predators. Nest sites were also close to …
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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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Attempts to cause differentiation of callus tissue of Abies concolor by tissue culture technique
Abies concolor (white fir) is one of the many conifers often planted as an ornamental tree. Like so many other conifers, Abies is difficult to vegetatively propagate. Recent successes in using the techniques of tissue culture as a means of vegetatively propagating plants prompted the present study …
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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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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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In vitro establishment, shoot multiplication, and rooting of Pinus strobus, Pseudotsuga menziesii, and Thuja occidentalis 'Hetz Wintergreen'
… great potential if it could be applied to mature conifers. The research objectives of this study were to improve disinfestation, axillary shoot proliferation and in vitro rooting of Pinus strobus (white pine), Pseudotsuga menziesii (Douglas fir) and Thuja occidentalis 'Hetz Wintergreen'.
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Hydrologic Response to Conifer Removal and Upslope Harvest in an Encroached Montane Meadow
… understand the efficacy of removal of encroached conifers from an encroached meadow (Marian Meadow) for successful meadow restoration. The objectives of this study are to determine (i) quantify the meadow hydrology following removal of encroached conifers, (ii) determine if forest tree removal …
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Molecular evolution of the RNA polymerase genes and the phylogeny of seed plants
… (angiosperms, and four gymnosperms groups: conifers, cycads, Ginkgo and Gnetales). These organisms diverged roughly three hundred million years ago and evolved independently since then. Therefore, morphological characters have limited power in resolving their phylogeny. With the advancement …
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Monarch Butterfly (Danaus plexippus) Tree Preference and Intersite Movement at California Overwintering Sites
… monarchs clustered disproportionately on native conifers, and they often switched from clustering on eucalyptus in the early winter to native conifers in the middle or late winter. Our results suggest that overwintering groves should be managed to include a mixture of tree species. We cannot …
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Multi-scale Remote Assessment of Phenology of Photosynthesis and Productivity of Northern Forests
… limited in monitoring the phenology of evergreen conifers due to the retention of green foliage year-round. Therefore, the main goal of my thesis is to evaluate the ability of carotenoid sensitive vegetation indices, photochemical reflectance index (PRI) and chlorophyll/carotenoid index (CCI), for …
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Changes in landscape patterns and associated forest succession on the western slope of the Rocky Mountains, Colorado
… in the relative total cover of aspen and conifers and a decrease in the relative coverage of rangelands. However, the number of patches and mean, relative patch size showed little significant change. High variability among sites reduces the significance of trends that are apparent in …
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Mid Cretaceous fossil forests of Alexander Island, Antarctica
… Open-woodland forests dominated by araucarian conifers, ferns and shrubs, occupied stable areas of the floodplain characterised by low-energy floods. Disturbance vegetation dominated by Taeniopteris, liverworts, angiosperms and ferns, occupied river channel banks where frequent floods provided …
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