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 74 for “"vascular plants"”.
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Modeling NatureServe subnational conservation status ranks for Tennessee vascular plants
… conservation status ranks (s-ranks) for the vascular flora of Tennessee using five methods: (1) assigning an s-rank based on surrounding state s-ranks, (2) assigning an s-rank based on the percentage of counties with an occurrence record, (3) using FME to calculate criteria and assign an …
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A comparative study of the vascular plants of three vernal pools in the San Joaquin Valley, California
… investigation was to enumerate and compare the vascular plant species occurring at three vernal pools in the San Joaquin Valley of California.</p>
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A comparative study of vascular plants associated with Allium tribracteatum Torrey and Allium obtusum Lemmon, with special consideration of the flora of the Mehrten Formation, Tuolumne and Calaveras Counties, California
… in the field. However a number of species of vascular plants were found that were associated only with one or the other of the species in question and were reliable indicators of the Allium species identity.</p> <p>Environmental impacts facing Allium tribracteatum include winter recreation …
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A chromatographic investigation of the sub-genera in the genus Equisetum Linn
… of the subdivision Sphenopsida of the vascular plants. A systematic study of the plant kingdom necessitates a study of Equisetum.
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The Vascular Flora of Montauk State Park, Dent County, Missouri
A floristic survey of the wild vascular plants of Montauk State Park, Dent County, Missouri was made from April 1974 to June 1975. An annotated list of 625 taxa encompassing 100 families and 180 Dent County records is included. Each taxon is discussed in relation to seven plant communities. A …
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The Vascular Flora of Lost Valley, Newton County, Arkansas
A floristic survey of the vascular plants of Lost Valley, Newton County, Arkansas, was made between April 1974 and May 1975. An annotated checklist of 636 taxa representing 102 families, 366 genera, and 249 Newton County records is included. Five plant communities are described which contain a …
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EFFECTS OF NITROGEN DEPOSITION ON BOREAL BOGS: A THREE YEAR NITROGEN FERTILIZATION AND TRACER EXPERIMENT
… moss, roots, litter, and aboveground vascular plants) and how these N pools process and retain applied N in four ombrogenous bogs in northern Alberta, Canada. Linear growth of Sphagnum mosses was highly variable. However, both capitulum and stem weight showed increase in weight with N …
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Biogeochemical and ecological responses to warming climate in High Arctic polar deserts
… are cryoturbic nutrient patches and support vascular plants in polar deserts. Frost-boil development and diapirs are expected to increase with the increase in temperatures and the permafrost thaw and are likely key for projected polar-desert evolutions. This dissertation investigated soil …
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Vegetation Survey of the Yegua Knobbs Preserve, Bastrop and Lee Counties, Texas
… A species inventory was done to identify the vascular plants present at the preserve for a growing season. Woody vegetation was sampled using the line intercept method, and herbaceous components were sampled using the quadrat method. Analysis of the qualitative and quantitative data led to the …
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Biodiversity of urban brownfields: modelling species occurrence and persistence in dynamic habitats
… Statistical species distribution models for vascular plants, leafhoppers and grasshoppers revealed the importance of spatio as well as temporal factors driving species occurrence. Furthermore, optimal settings for urban planning were identified. A dynamic metapopulation model supported these …
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Environmental analysis of the habitat (biotic and abiotic factors) associated with Broadleaf Barbara's Buttons (Marshallia trinervia)
… LA. Twenty two plots were sampled for all vascular plants. Of these, 17 samples were from the area where M. trinervia was present and 5 samples were from the area where M. trinervia was absent. From each sampling plot a soil sample was collected and analyzed. There were significant …
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The Physiological Response of sub-Arctic Lichens to Their Abiotic Environment
… arcticum and C. mitis; suggesting, as found in vascular plants, lichens exhibit photosynthetic characteristics adapted to their abiotic environment. C. mitis thalli did not provide any evidence of plastic adaptation to temperature over a six day storage period; whereas, N. arcticum samples …
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Aapasuon kasvillisuus ja sen vaikutus hiilidioksidin vaihtoon
… activity. The photosynthetic efficiency of plants depends on environmental factors and the amount and development of plant leaf area and biomass. There is not much research on the leaf area index and biomass of plants on aapa mires which makes them an interesting and important subject of …
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BRYOPHYTE ASSEMBLAGES ON AMERICAN HORNBEAM (CARPINUS CAROLINIANA) AND THE SURROUNDING ARBOREAL COMMUNITIES WITHIN THE FOREST OF EAST TEXAS
<p>The bryophytes, the non-vascular plants, include the mosses (Bryophyta with approximately 13,000 species), the liverworts (Marchantiophyta with approximately 5,000 species), and the hornworts (Anthocerotophyta with approximately 150 species). Initial observations indicated that the midstory tree …
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A Vascular Flora of the Nopah Range, Inyo County, California
… to complete a specimen-based inventory of the vascular plants resulting in the production of an annotated checklist, and to assess the status of rare plant species and possible edaphic endemics within the study area. Between 2018 and 2022, 73 days were spent in the field resulting in 1,201 …
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The potential of restored landfill sites for biodiversity conservation in the UK
… biodiversity potential of these novel habitats. Plants (vascular plants and bryophytes), invertebrates (carabid beetles and land snails), and vertebrates (birds) were studied on nine restored landfill sites and paired reference sites in the East Midlands region of the UK during 2007 and 2008. …
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Experimental warming of subarctic biocrust: Temporal responses of soil respiration and plant community
… also focuses on species composition changes of vascular plants in the warming experiment where warming was induced with open-top chambers (OTCs). Soil respiration, temperature, soil water content, as well as plant species composition changes were measured during three field trips that each …
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Ground Layer Response to Disturbance in the Pine-Dominated Eastern Foothill Region of West-Central Alberta, Canada
… dramatic changes. Dominant species of both vascular plants and bryophytes decreased with increasing canopy openness, with vascular plants being gradually affected while mosses were more affected at less intense canopy opening. Abundances of lichens showed no change. When measuring limiting …
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