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 13 of 13 for “"white ash"”.
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The development of sampling methods for key-year patterns of white ash (Fraxinus americana L.)
… of historical significance (Heikkenen 1980). A white ash key-year pattern was constructed, using 4 radii from 3 tree heights of 16 trees. Radii from a tree height of 0.3. (1 ft) above ground were found to have higher agree.ent with the white ash key-year pattern than radii from positions higher …
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Differential Canopy Leaf Flushing and Site Nitrogen Status Facilitate Invasive Species Establishment in Temperate Deciduous Forest Understories
… (oak/hickory), <em>Fraxinus americana </em>(white ash), <em>Robinia pseudoacacia</em> (black locust), and <em>Pinus </em>spp<em>./Tsuga canadensis</em> (pine/hemlock). Measures of understory light availability post-leaf expansion were significantly higher under quaking aspen than other …
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The combined effects of ozone, sulfur dioxide and simulated acid rain on the growth of three forest tree species
Nine-week-old yellow-poplar and green and white ash were exposed to various concentrations of O₃ (0.00 to 0.15 ppm) and/or SO₂ (0.08 ppm), 4 hr/d, 5d/wk in combination with simulated rain (pHs 5.6, 4.3, 3.0), 1 hr/d, 2 d/wk, for 5 or 6 wk under controlled laboratory conditions. Pollutant exposures …
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An Investigation Of The Soils Within And Beneath The Middens Of Two Huron Villages
… labeled charcoal, midden matrix, subsoil, grey ash and white ash. Chemical analyses of samples taken from these layers enabled a computer cluster analysis of these materials. If the clustering routine was halted when four groups had been identified it was found that the white ash and to some …
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The Position of a Chair
A chair was made of northern white ash wood. Steamed laminates make up each leg, and the spans are solid wood. A bent seat perches on this frame. Drawings, words, and photographs expose the chair in this book. A full exposition of the work can be found in the Art and Architecture Library at the …
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The Effects of Forest Fires on Runoff Rates: The Role of Duff Removal and Surface Sealing by Vegetative Ash, Western Montana
… and litter layer. To further examine the role of ash in post-fire environments, micromorphological assessment of soil profiles were conducted via thin section analysis. Within granitic soils, burning resulted in a decrease in mean infiltration capacity from 9.1 to 3.5 cm.hr-1, while burning had no …
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The Effects of Forest Fires on Runoff Rates: The Role of Duff Removal and Surface Sealing by Vegetative Ash, Western Montana
… and litter layer. To further examine the role of ash in post-fire environments, micromorphological assessment of soil profiles were conducted via thin section analysis. Within granitic soils, burning resulted in a decrease in mean infiltration capacity from 9.1 to 3.5 cm.hr-1, while burning had no …
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Influence of Transplanting Practices on Growth and Embolism Levels For Urban Tree Species
… Results varied between Fraxinus americana L. (white ash) and Acer rubrum L. x saccharinum L. (hybrid red maple), but data suggested white ash stem samples should not be stored more than one day, especially for between-species comparisons. A greenhouse experiment investigated the growth and …
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Characteristics and Perceptions of Cost-share Funding for Emerald Ash Borer Mitigation in Virginia Urban Areas
… to the health of all forests. While the emerald ash borer (EAB) (Agrilus planipennis Fairmaire) has proved difficult to contain, efforts continue to mitigate the impacts of its spread. As part of those efforts, the Virginia Department of Forestry (VDOF) initiated its Emerald Ash Borer Treatment …
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Growth loss of loblolly pine (Pinus taeda L.), white pine (P. strobus L.) and sycamore (Platanus occidentalis L.) proximal to a periodic source of air pollution
… trees. Three stands of loblolly pine, two of white pine, and one of sycamore proximal to the emission source were sampled by obtaining increment cores at d.b.h. (1.37 m from the base of the tree) from 50 trees in the dominant or codominant crown class of each stand. A multiple linear …
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Coordination of physiological and morphological acclimation of shade-grown tree saplings to late-season canopy gap formation
… tulip poplar (Liriodendron tulipifera L.), and white ash (Fraxinus americana L.). Physiological acclimation responses included higher photosynthetic rates in shade-developed foliage upon exposure to higher irradiance and temperature conditions within the gap for each species. However, the …
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Efficacy and Effect of Tree Stabilization Systems On Landscape Tree Growth and Establishment
… and burlapped, 6.4 cm (2.5 inch) diameter, white ash (Fraxinus americana L. Autumn Purpleâ ) were transplanted to a field site in Blacksburg, VA. At planting, one of four TSS treatments (staking, guying, root ball anchoring, or non-stabilized) was installed on each tree. After five weeks, …
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Evaluation of Topsoil Substitutes for Restoration of Appalachian Hardwoods on Strip Mined Land
… mine spoils, brown, weathered sandstone (BWS), white, unweathered sandstone (WUS), and gray, unweathered shale (GUH) were compared with undisturbed forest topsoil (UFT) to determine their suitability for tree growth. Half of each of the four media was inoculated with a 2.5-cm layer of topsoil. …