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 45 for “"stumps"”.
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Soil resource heterogeneity and site quality in Southern Appalachian hardwood forests: Impact of decomposing stumps, geology and salamander abundance
… 1) to examine and quantify the role of decaying stumps in regards to total carbon (C) and nitrogen (N) pools and fine-root dynamics, 2) compare and contrast the use of ground-penetrating radar (GPR) vs. a soil auger for estimating soil depth and site quality and 3) to evaluate how eastern …
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Soil Carbon Dioxide Efflux in a Naturally Regenerated and a Planted Clear-Cut on the Virginia Piedmont
… away (1m) from newly planted seedlings and cut stumps using a dynamic, closed-chamber infrared gas analyzer system. For each measurement date, volumetric water content was taken in the top 17cm, using time domain reflectometry (TDR) and soil-surface temperature was recorded in the top 7cm, using …
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Identification of Fossil Wood from the Specimen Creek Area of the Gallatin Petrified Forest, Yellowstone National Park, Montana
… Forest contain spectacular petrified tree stumps, trunks and logs in horizontal and vertical positions. These fossils forests are embedded in early middle Eocene volcaniclastic rocks and piled in sequential layers.</p> <p>One hundred and nineteen fossil wood samples were collected from …
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The Historic Fire Return Interval and the Ecological Effects of Fire Suppression on Montane Longleaf Pine Dominated Ecosystems in Northwestern Georgia.
… interval was estimated using remnant longleaf stumps and dendrochronological techniques. Results from chi-squared tests indicated the modern forest is significantly more mesic and fire-intolerant than the historic forest (p < 0.0001), with no statistically significant difference in species …
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A study of indications and complications of the lower limb amputations in the university teaching hospital,Lusaka,Zambia
… study, it was observed that the majority of the stumps healed primarily before discharge in 21 (39%). However, the commonest complication was infection in 14 patients (26.0%)) and this lead to revision of stumps in 8 patients (15%). There were 7 mortalities, e of these were related to the primary …
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A study of indications and complications of the lower limb amputations in the university teaching hospital,Lusaka,Zambia
… study, it was observed that the majority of the stumps healed primarily before discharge in 21 (39%). However, the commonest complication was infection in 14 patients (26.0%)) and this lead to revision of stumps in 8 patients (15%). There were 7 mortalities, e of these were related to the primary …
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Soil Co2 Efflux and Soil Carbon Content as Influenced by Thinning in Loblolly Pine Plantations on the Piedmont of Virginia
… every month for one year near randomly selected stumps and trees. In order to account for spatial variation, split plots were measured at positions adjacent to stumps and 1.5 meters away from stumps. Soil temperature and moisture were both significantly affected by thinning. Regression analysis …
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Ecological impact of entomopathogenic nematodes used to control the large pine weevil, Hylobius abietis (Coleoptera: Curculionidae)
… Europe. Its larvae develop in coniferous tree stumps on clearfell sites and adult weevils feed on seedlings that are replanted on these sites, causing substantial mortality. As the drive towards achieving the sustainable management of natural resources increases, biological control agents are …
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Characterization of Sentinel Butte Petrified Wood and Host Lithology Associations
… tree type. In the study site, fossilized tree stumps were concentrated along one continuous clay horizon. Twenty petrified wood samples were obtained. Five representative samples were chosen for thin section characterization. Microscopic analyses revealed well preserved plant structures …
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"The use of retinoids and an in vivo ""affinophoresis"" assay to analyze the cellular basis of positional memory in regenerating axolotl limbs"
… intercalary regeneration from more proximal limb stumps. Recently, retinoids (vitamin A and its derivatives) have been shown to predictably modify positional memory in regenerating amphibian limbs resulting in PD duplications of stump structures within the regenerate. This discovery creates a …
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The biology of the tobacco flea beetle in Virginia: Epitrix parvula (F.) (Coleoptera: Chrysomelidae)
… tobacco field, especially around the old tobacco stumps of the previous season. More beetles survived the winter in the soil around the base of the tobacco stumps than in the organic material around these stumps. During the spring of 1938 the tobacco flea beetles emerged from hibernation at …
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Food Habits and Ecology of Beavers in Southeastern Virginia
… basis and a daily tally was made of all cut stumps. Alder, tulip poplar, red maple, white oak, bayberry, dogwood, pine, ironwood, viburnum, beech, and spicebush were heavily used. The latter three species have not been previously reported in the literature as food for beavers. Beaver were …
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Collagen implants to promote regeneration of the adult rat spinal cord
… the resulting gap between the severed nerve stumps. The current study aims to apply this same regenerative approach to a defect created in the spinal cord of adult rats. The objective is to evaluate the efficacy of three different collagen implants toward the regeneration of the spinal cord. …
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Evaluating and improvement of tree stump volume prediction models in the eastern United States
… planet. After forest harvest, the residual tree stumps persist on the site for years after harvest continuing to store carbon. A bigger concern is that the component ratio method requires a way to get stump volume to obtain total tree aboveground biomass. Therefore, the stump volumes contribute …
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Potential of above- and below-ground coarse woody debris as a carbon sink in managed and unmanaged forests
… of below-ground CWD was estimated by uncovering stumps of known age. For each tree species, five stumps were sampled in their entity for two or three different times of tree death. Total mass and volume as well as C concentration of a representative number of sub-samples were measured. The great …
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Behavioural interactions between the large pine weevil, Hylobius abietis L.(Coleoptera: Curculionidae), and entomopathogenic nematodes
… in Irish forestry. Applications of EPN to tree stumps in Ireland and the UK have been shown to significantly reduce adult H. abietis populations emerging from the stumps. To date however, little work had been done on the host-finding abilities of applied EPN in the field and how those EPN will …
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Effects of Site Preparation, Seed Germination, and Harvest Maturity on Wiregrass Restoration Efforts at Fort Stewart, GA
… have been cleared of all vegetation. Removal of stumps, roots, and debris causes a high level of disturbance to the upper soil layer. Disturbed soil must first be leveled and compacted before wiregrass seed can be sown effectively. The first objective of this study was to study the effect of …
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Peripheral nerve regeneration through collagen devices with different in vivo degradation characteristics
… used to fabricate the tubes used to bridge the stumps of a transected nerve, and collagen tubes have been specifically shown to improve the quality of regeneration. The optimal characteristics for the tube have yet to be identified, and a collagen device that can be manipulated and optimized to …
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Successive Land Surveys as Indicators of Vegetation Change in an Agricultural Landscape
… Witness corners recorded tree species, shrubs, stumps, snags and non vegetative markers. Types of witness corners were tallied and tested for shifts in frequency across time periods. Tree species were also classified by silvical characteristics including sprouting capability, shade tolerance, …
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Factors affecting plant community composition and dynamics in the Ossipee Pine Barrens, New Hampshire
… on reverse growth estimates of current stems and stumps. Future (2052) vegetation was predicted by current sapling (<10 cm dbh and ≥1 m tall) relative densities.</p><p>Cluster analysis produced three community types from 121 STA's: pitch pine, mixed pine-hardwoods, and red maple. Pitch pine …
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