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Hydrophobicity of Cindery Typic Cryorthents

Creator:: Evans, Lynn B.
Abstract:: The hydrophobicity of soils of the Deschutes National Forest was studied. The soils are Cindery Typic Cryorthents, formed in cinders and ash from Mt. Mazama. Ponderosa pine is the dominant overstory vegetation. Of particular interest was the effect of prescribed burning on hydrophobicity. Fire has been shown to cause a...
Resource Type:: Masters Thesis
Full Text:: OF THE THESIS OF Lynn B. Evans for the degree of Master of Science in Soil Science presented on

Dynamic mathematical model of oxygen and carbon dioxide exchange between soil and atmosphere

Creator:: Ou-yang, Ying
Abstract:: Gaseous transport through soil in the presence of soil microorganisms has been investigated. More recently, modeling of gaseous transport in the unsaturated zone has been investigated. However, the problem of mathematical model of oxygen and carbon dioxide transport through soil, as affected by the climatic conditions, the transport of soil...
Resource Type:: Dissertation
Full Text:: Larry boersma Gaseous transport through soil in the presence of soil microorganisms has been

Dynamic mathematical model for transport processes in plants

Creator:: Sangkhasila, Kumut
Resource Type:: Dissertation
Full Text:: Abstract approved: Larry Boersma A mathematical model describing the xylem and phloem transport

Simulation and field validation of heat and water flow during soil freezing and thawing

Creator:: Pikul, Joseph Lawrence
Abstract:: Freeze/thaw cycles are numerous in agricultural soils of the Pacific Northwest. Potential loss of soil by erosion is high whenever a soil thaws from the surface creating a saturated soil overlying an impermeable frozen layer. Field studies were conducted to investigate the effect of surface residue on soil freezing. Residue...
Resource Type:: Dissertation
Full Text:: Larry Boersma Freeze/thaw cycles are numerous in agricultural soils of the Pacific Northwest

Diffusion and surface reaction processes of absorption on surfaces of soil particles in unsaturated soils

Creator:: Yingjajaval, Suntaree
Abstract:: At present the adsorption kinetic of ions by soil particles is considered to be a surface reaction. When the transport of solutes in soils is described using the one-dimensional flow equation, it becomes a serious problem that lateral diffusion of ions from the bulk solution towards the soil surfaces is...
Resource Type:: Dissertation
Full Text:: is as at (0/pb)C - [ 1 is, d +1/(k 1 (k 1 /k2)(1 /K )+ 1 /(k2 b) where Kd (sec-1) is the

Diffusion of oxygen and carbon dioxide through soil with temperature and water content effects on sink/source strength

Creator:: Ying, Ouyang
Abstract:: Gaseous diffusion equations which describe the diffusion of oxygen and carbon dioxide through soil have been studied by several investigators. However, these efforts seldom considered gaseous diffusion through soil together with the effects of soil environmental factors such as soil temperature and soil water content on sink or source strength....
Resource Type:: Masters Thesis
Full Text:: Strength 7 Redacted for Privacy Abstract approved: / Larry Boersma Gaseous diffusion equations which

Infiltration of water and its effects on soil erosion : a computational analysis pertaining to central Tunisia

Creator:: Tobbi, Belgacem
Abstract:: The purpose of this study was to use computer analysis of soil and rainfall data to predict the possible occurrence of soil erosion in Central Tunisia. Analysis was done with the program OR-NATURE (M.Ungs et al, 1985) . Central Tunisia was subdivided into northern, central, and southern subzones. Data about...
Resource Type:: Masters Thesis
Full Text:: Tunisia. Redacted for Privacy Abstract approved by: D,,{`. Larry Boersma The purpose of this study was

Effects of petroleum mulch on soil water content and soil temperature

Creator:: Kowsar, Ahang
Abstract:: Petroleum mulch applied on the soil surface over a row of planted seeds promotes a more rapid and a more uniform germination of seeds, enhances elongation of seedlings and in some cases increases the yield of the crop. The beneficial effects of petroleum mulch have usually been attributed to increased...
Resource Type:: Masters Thesis
Full Text:: WATER CONTENT AND SOIL TEMPERATURE Abstract approved: Larry Boersma Petroleum mulch applied on

A continuum model of plant root growth

Creator:: Feng, Yongsheng
Abstract:: The continuum theory provides a framework in which the growth of a plant root as a dynamic process involving interactions among transport of water and solute, cell division, and the subsequent cell elongation can be described. A plant root is modeled as a one-dimensional, multi-phase, mathematical continuum. The network of...
Resource Type:: Dissertation
Full Text:: ACKNOWLEDGEMENTS I, would like to express my deep appreciation to Dr. Larry Boersma for his support

Consolidation, compression, and shear strength of four western Oregon forest soils

Creator:: McNabb, David H.
Abstract:: Forest soils with low bulk densities are often considered less susceptible to compaction than soils with higher bulk densities. The objective of this study was to determine if soil strength controlled the compression of soils with low bulk density. Four soils were selected for this evaluation. Three of these were...
Resource Type:: Dissertation
Full Text:: of Four Western Oregon Forest Soils Redacted for Privacy Abstract approved: Larry Boersma Forest

ScholarsArchive@OSU

Hydrophobicity of Cindery Typic Cryorthents

Dynamic mathematical model of oxygen and carbon dioxide exchange between soil and atmosphere

Dynamic mathematical model for transport processes in plants

Simulation and field validation of heat and water flow during soil freezing and thawing

Diffusion and surface reaction processes of absorption on surfaces of soil particles in unsaturated soils

Diffusion of oxygen and carbon dioxide through soil with temperature and water content effects on sink/source strength

Infiltration of water and its effects on soil erosion : a computational analysis pertaining to central Tunisia

Effects of petroleum mulch on soil water content and soil temperature

A continuum model of plant root growth

Consolidation, compression, and shear strength of four western Oregon forest soils

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