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Performance of Pinus ponderosa seedlings in clearcuts, patch cuts and undisturbed forests on lavas

Creator:: Hutten, Martin A. B.
Abstract:: The survival, growth, foliar nutrient status, ectomycorrhiza (EM) colonization, and associative N-fixation of ponderosa pine seedlings (Pinus ponderosa var. ponderosa Doug!. ex Laws.) were studied under different gap sizes in forest canopy during the first growing season. Seedling performance variables were assessed relative to gap size of the forest canopy...
Resource Type:: Masters Thesis

A qualitative and quantitative characterization of porosity in volcanic ash

Creator:: Doak, William Herman, 1941-
Abstract:: Soils developed on volcanic ash exhibit several unique properties not commonly observed in soils formed on other geologic material. Low thermal conductivities, low volumetric heat capacities, slow transport phenomena, excess macro-drainage and development of unique suites of clay minerals are some properties thought to be directly related to the vesicular...
Resource Type:: Masters Thesis
Full Text:: phyllosilicates. The widespread distribution of volcanic ejecta in central Oregon (Williams, 1942) and its

Petrology of the Bend pumice and Tumalo tuff, a Pleistocene Cascade eruption involving magma mixing

Creator:: Hill, Brittain Eames
Abstract:: The Bend pumice and Tumalo tuff are products of a plinian eruption which occurred sometime between 0.89 and 2.6 m.y. The Bend pumice is a poorly consolidated, air-fall vitric lapilli tuff, which overlies a zone of reworked tephra. Perlitic obsidian in the reworked zone probably represents the remains of a...
Resource Type:: Masters Thesis

Volcanology and petrology of the Rattlesnake Ash-Flow Tuff, eastern Oregon

Creator:: Streck, Martin J.
Abstract:: The Rattlesnake Ash-Flow Tuff erupted 7.05±0.01 Ma from the western Harney Basin, southeastern Oregon. The location of the vent area is inferred based on vent-ward increases in size of pumices, in degree of welding, and in degree of post-emplacement crystallization. Today's outcrops cover 9000 km2 and estimated original outcrop coverage...
Resource Type:: Dissertation
Full Text:: of the Rattlesnake Ash-Flow Tuff, Eastern Oregon. Abstract approved: Anita L. Grun r The

Nature of interlayer material in silicate clays of selected Oregon soils

Creator:: Singleton, P. C.
Abstract:: A study was conducted to investigate the nature of hydroxy interlayers in the chlorite-like intergrade clays of three Oregon soils with respect to kind, amount, stability, and conditions of formation. The clays of the Hembre, Wren, and Lookout soils, selected to represent weathering products originating from basaltic materials under humid,...
Resource Type:: Dissertation
Full Text:: . Oregon researchers have indicated that the presence of inter - grade clay in soil samples may lead to

Cation retention and solute transport related to porosity of pumiceous soils

Creator:: Doak, William Herman, 1941-
Abstract:: Previous studies of pumiceous soils in Oregon indicated that their physical and chemical properties were strongly related to the porous nature of the pumice matrix. Soils developed on air-fall pumice from the eruption of Mt. Mazama (Crater Lake, Oregon) had low thermal conductivities and low volumetric heat capacities. Values for...
Resource Type:: Dissertation
Full Text:: Oregon should reflect these soil chemical and physical properties . Cation Retention and Solute

Water and anion movement in selected soils of western Oregon

Creator:: Hammermeister, Dale P.
Abstract:: Experiments were carried out to study the movement of water and halide anions in perched water tables or saturated zones in the soil and upper rock mantle of eight different experimental sites located on low hills near the western border of the Willamette Valley. At each site the experimental procedure...
Resource Type:: Dissertation
Full Text:: Oregon AN ABSTRACT OF THE THESIS OF Dale Hammermeister for the degree of Doctor of Philosophy in Soil

Morphology and genesis of the Condon, Morrow, and Walla Walla series of the Mid-Columbia basin, Oregon

Creator:: Douglass, John Franklin
Resource Type:: Dissertation

Variations of moisture retention properties and bulk densities of soils between and within soil-mapping units in central Oregon

Creator:: Jibury, Falih Khidir
Abstract:: The objective of this study was to estimate the bulk densities and points on the moisture-tension curves and to determine their associated variances for some of the selected mapping units in Central Oregon. These variances will produce informations concerning the precision of the mean and the optimum sampling schemes, for...
Resource Type:: Masters Thesis

The geology and stratigraphy of the Tertiary volcanic and volcaniclastic rocks, with special emphasis on the Deschutes Formation, from Lake Simtustus to Madras in central Oregon

Creator:: Jay, Jeremy Barth
Abstract:: A sequence of volcanic, volcaniclastic, and epiclastic deposits from Oligocene to Recent age are exposed in the region from Lake Simtustus to Madras in central Oregon. The epiclastic sediments of the Oligocene John Day Formation are unconformably overlain by two flows of the middle Miocene Columbia River Basalt Group. The...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Performance of Pinus ponderosa seedlings in clearcuts, patch cuts and undisturbed forests on lavas

A qualitative and quantitative characterization of porosity in volcanic ash

Petrology of the Bend pumice and Tumalo tuff, a Pleistocene Cascade eruption involving magma mixing

Volcanology and petrology of the Rattlesnake Ash-Flow Tuff, eastern Oregon

Nature of interlayer material in silicate clays of selected Oregon soils

Cation retention and solute transport related to porosity of pumiceous soils

Water and anion movement in selected soils of western Oregon

Morphology and genesis of the Condon, Morrow, and Walla Walla series of the Mid-Columbia basin, Oregon

Variations of moisture retention properties and bulk densities of soils between and within soil-mapping units in central Oregon

The geology and stratigraphy of the Tertiary volcanic and volcaniclastic rocks, with special emphasis on the Deschutes Formation, from Lake Simtustus to Madras in central Oregon

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