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 29 for “"seed source"”.
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EFFECTS OF TIME, SEED SOURCE, AND PLANT COMPOSITION ON MACROINVERTEBRATES IN RESTORED PRAIRIE
… ecological restoration and examine whether the source of dominant plant species and the composition of non-dominant plant species influence aboveground macroinvertebrates community structure in restored prairie. A chronosequence design (space for time substitution) was used to determine the role …
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The effect of agitation on the biochemical oxygen demand sewage
… of agitation, the composition of the sewage, the seed source, the temperature and the dilutions were held constant.
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Effects of gypsy moth defoliation on acorn production and viability, litterfall, and litter layer depth and biomass in north-central Virginia and western Maryland
… gypsy moth defoliation on acorn production (the seed source for oak regeneration), and the forest floor regeneration environment were investigated. Parameters measured included: acorn quantity, weight, development, and viability; litterfall; and forest floor depth and biomass. Nineteen plots in …
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Factors affecting plant community composition and dynamics in the Ossipee Pine Barrens, New Hampshire
… and successional dynamics by (1) soils, (2) seed source, and (3) disturbance was investigated using field evidence, accounts from residents and forest managers, and dendrochronology. Factors affecting forests since stand formation were analyzed individually and with multivariate techniques. …
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Spatial and temporal dynamics of plants colonizing species-poor hedgerows
… in close proximity to remnant ancient woodland seed sources, and evaluates immigration, colonization and establishment processes that occur at this interface. Transects were used to sample plant species distributions across the transition between remnant ancient woodland communities and …
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The conservation genetics of the Clanwilliam cedar (Widdringtonia cedarbergensis)
… in an attempt to boost population numbers with a seedling replanting scheme and preservation of adults from fires. This study set out to determine levels of genetic diversity and fitness within and among populations of the Clanwilliam cedar for the following reasons: (1) to assess the level of …
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Saltcedar (Tamarix spp.) in the Northern Great Plains: Seed Ecology and Cultural Considerations
… studies were conducted to 1) evaluate saltcedar seed ecology dynamics in a controlled growing chamber setting, 2) assess the seasonality of saltcedar seedlings in the northern Great Plains (NGP), and 3) to determine native Lakota cultural viewpoints of saltcedar and its impacts on the tribes in …
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Seasonal Movements of White-tailed Deer in Eastern South Dakota and Southwestern Minnesota Relative to Traditional Ranges and Management Unit Boundaries
… studies were conducted to 1) evaluate saltcedar seed ecology dynamics in a controlled growing chamber setting, 2) assess the seasonality of saltcedar seedlings in the northern Great Plains (NGP), and 3) to determine native Lakota cultural viewpoints of saltcedar and its impacts on the tribes in …
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Consumer awareness and belief regarding the health implications of soy
… awareness of soy, including which information source enabled consumers to form their beliefs regarding soy's health implications. Controversy surrounds the much-researched topic of soy, including its isolated compounds, processing and manufacturing methods, seed source, and consumption amounts. …
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Quantitative analysis of active compounds found in Arnica montana and Arnica chamissonis in relation to varied provenance, environmental and agronomic factors.
… soils. The flowers are well documented as a source of natural products, particularly, active compounds associated with antiinflammatory properties. The high demand for this extract has meant that wild plant numbers have reduced dramatically and now in many countries, it is illegal to harvest …
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Morphological and Physiological Responses of Senegalia senegal (L.) Britton Provenances to Drought, Salinity, and Fertility
… early growth and photosynthetic response of seed sources to a cyclic drought treatment. The second greenhouse study examined seed source response to drought, salinity and fertility conditions. Gum yield assessment, growth and WUE of mature trees were determined from a field trial. In general, …
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Population-Level Differences in Pinus monophylla Whole-Plant Seedling Strategies Under Varying Precipitation Pulses
… on the presence of functional traits that allow seedlings to survive selective pressures from altered climate regimes. Many widely-distributed plant species exhibit intraspecific trait variation reflecting adaptation to local environments. Populations may vary in traits that regulate seedling …
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Herbaceous and woody plant establishment across hydrologic gradients in bottomland reforestation sites
… and the distance from potential colonization sources. However, trees are often planted in restorations without regard to the site’s hydrologic context and do not survive. Therefore, there is a need to understand the relative importance of abiotic factors on tree and herbaceous species …
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The development of high power, pulsed fiber laser systems and their applications
… Using this gain switched laser diode as a seed source; the output gain switched pulses were compressed to 20 ps using a fiber compressor and thereafter amplified to achieve an output average power of 11.1 W at 1 GHz repetition rate using an YDFA cascade. Additional novel work was carried …
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Molecular Marker Applications in Oat (Avena Sativa L.) Breeding and Germplasm Diagnostics
… methodologies for cultivar identification, seed purity assessment and trait selection in oat (Avena sativa L.). KBioscience’s Allele-Specific PCR (KASP™) and genotyping-by-sequencing (GBS) technologies were applied to a set of current Canadian oat cultivars to evaluate their utility for …
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Evaluating cover crops and herbicides for horseweed and Palmer amaranth management
… weed density by 75% by 8 weeks after cover crop seeding in the fall. At cover crop termination two weeks prior to soybean drilling. Cereal rye reduced horseweed biomass more than herbicide treatments, but after termination weed control was similar across treatments. Soybean yields were greater …
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Community and ecosystem changes in tallgrass prairie restorations: the effects of population source and diversity
… quantify the effects of dominant grass propagule source (i.e., cultivar vs. non-cultivar) and seeded diversity of propagules on community structure and ecosystem function during prairie restoration. Two field experiments, and two chronosequences were used to investigate this main objective. The …
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Assessing the Phytoextraction of Organic and Inorganic Pollutants From Point Pelee National Park, Ontario and Iqaluit, Nunavut
… selected for a follow-up greenhouse study. Two seed sources of A. gerardii (one commercial and one collected from PNPP) were grown in PPNP soil contaminated with DDT concentrations of 1,059 ng/g (low) and 5,071 ng/g (high). Mean levels of DDT in plant shoots were significantly higher (100.64 ± …
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PATTERNS OF SEEDFALL AND SEEDLING ESTABLISHMENT IN AN EAST TEXAS RIVER FLOODPLAIN FOREST: THE CONTRIBUTION OF SEEDLING DYNAMICS TO SPECIES COEXISTENCE (PLANT DEMOGRAPHY, DISPERSAL, TREE REGENERATION, SURVIVORSHIP, MORTALITY)
I investigated spatial and temporal patterns of seed deposition, seedling appearance, survivorship, and growth in an East Texas river floodplain forest from 1980 through 1984, and estimated the importance of several factors including flooding, drought, shading, insect herbivory, and fungal attack …
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