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 99 for “"Coniferous"”.
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Previsual detection of stressed coniferous trees
The study consisted of two parts: following the fade rates of killed field-grown Virginia pine (<u>Pinus virginiana</u> Mill.); and to study the effects of different stresses on seedlings. Foliage fade rates of killed field-grown Virginia pine varied with the time of the year the tree was killed. …
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Nitrogen deposition and nitrification in coniferous forests’
… deposition on soil solution chemistry of six coniferous forest sites the presence of live roots, b) the impacts of (NH4)2SO4 deposition on Norway spruce (Picea abies [L.] Karst) and Scots pine (Pinus sylvestris L.) fine roots, and c) the controls of nitrification in an acid forest soil. The …
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THE CHARACTERIZATION AND MODELLING/OF SOIL WATER PATHWAYS BENEATH A CONIFEROUS HILLSLOPE IN MID WALES
Streams draining coniferous plantations contain higher loadings of hydrogen ion, aluminium, sulphate and nitrate, in comparison with streams in adjacent grasslands. Almost all of this ion-load is transported to streams via subsurface water-pathways. An incontrovertible, physical characterization of …
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A Comparative Study of Tree Structure and Composition of a mixed Coniferous Forest and Sequoia Groves in Sequoia National Park, California
… giant sequoia grove and in the surrounding mixed coniferous forest is dominated by Abies concolor. The large basal area of Sequoiadendron giganteum is significant within the grove in terms of relative dominance but does not offset the density of Abies concolor which showed nearly identical …
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Canopy, terrain, and distance effects on Global Positioning System position accuracy
… distinct conditions: three canopy (deciduous, coniferous, open) and three terrain (ridge, slope, valley) in all possible combinations. Each site was visited ten times over a span of eight months to collect position data, for ten replicates of 60, 100, 200, 300, and 500 position fixes. The mean …
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Defining agricultural land use in Rondonia, Brazil by examination of spot multispectral data
… distinct conditions: three canopy (deciduous, coniferous, open) and three terrain (ridge, slope, valley) in all possible combinations. Each site was visited ten times over a span of eight months to collect position data, for ten replicates of 60, 100, 200, 300, and 500 position fixes. The mean …
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An Object-Oriented Approach to Forest Volume and Aboveground Biomass Modeling using Small-Footprint Lidar Data for Segmentation, Estimation, and Classification
… of an object-oriented approach to deciduous and coniferous forest volume and above ground biomass estimation, based solely on small-footprint, multiple return lidar data. The study area is located in Appomattox Buckingham State Forest in the Piedmont physiographic province of Virginia, U.S.A, at …
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Acidification and eutrophication of forests on sandy soil: effects of forest type and deposition load
… The prevailing forest types are plantations of coniferous tree species (Pinus sylvestris, Pinus nigra) which have, in comparison to other vegetation types, a higher filtering capacity due to their higher leaf area index and evergreen character. Besides the acidification of the soil, clear …
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Effectiveness of Shelterbelts In Improving Microclimatic Conditions for Pheasants In Eastern South Dakota
… between shelterbelts containing 1 or 2 rows of coniferous tree species with shelterbelts comprised entirely of deciduous tree species and between wetland and shelterbelt habitats. Maximum temperatures within both shelterbelt types, particularly deciduous shelterbelts, were cooler than outside …
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Foliar damage and shoot growth changes resulting from exposure of eastern white pine seedlings to nightly acidic mists
Eastern white pine is an important coniferous forest species of the northeastern United States where nightly acidic mists may be a factor in the decline of highland forests. During 3 studies, experimental mists were applied nightly in order to simulate nocturnal misty conditions common in the …
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Assessment of the impacts of climate change, land cover transition, and internal climate variability on the hydrology of a forested watershed
… is a snow-dominated forested watershed with coniferous, deciduous and mixed trees and numerous small lakes. A semi-distributed hydrological model, based on the Raven hydrological framework, is calibrated and validated using ground-based observations for 1981-2001 and 2002-2011, respectively. …
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Changes in landscape patterns and associated forest succession on the western slope of the Rocky Mountains, Colorado
… to assess changes in major vegetation types (coniferous forest, aspen forest, rangelands) on the western slope of the Rocky Mountains, Colorado, U.S.A. The photographs span a period of 80 to 110 years, thus representing a century of change since the large mining-related disturbances associated …
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Effects of Infanticide Risk and Timber Harvest on American Black Bear Space Use
… use did not differ between deciduous stands and coniferous stands, or among land cover types except that grass/pasture and open water were avoided. Bear use was greater in areas farther from roads. Managing the amount of black bear resources appears possible by considering the number, size, type, …
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MEASUREMENTS AND MODEL PREDICTIONS OF HYDROXYL RADICAL, PEROXY RADICALS, AND NITROUS ACID: EVIDENCE OF MISSING SOURCES OR SINKS IN FORESTED AND INDOOR ENVIRONMENTS
… radical species and their major precursors in a coniferous forest emphasize the importance of nitrous acid (HONO) on ROX concentrations. HONO photolyzes to iv form OH and NO, producing a substantial amount of total ROX. HONO concentrations are particularly difficult to model, as there are …
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