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The effects of defoliation on yellow starthistle (Centaurea solstitialis L.) reproductive capacity

Creator:: Schumacher, Stacy
Abstract:: Yellow starthistle (Centaurea solstitialis L.) is an introduced Asteraceae that has become established on 10 million acres in the Pacific Northwest and California. This weed functions as an annual or short-lived perennial and depends on seeds for reproduction. Strategies of control that reduce plant fitness or lower seed production or...
Resource Type:: Masters Thesis
Full Text:: as 10,000 seeds (Maddox 1981). Sheley and Larson (1994) observed a seed output of2l,600 seeds m2 and

Elevation, thermal environment, and stream temperatures on headwater streams in northeastern Oregon

Creator:: Meays, Cynthia L.
Abstract:: A case study examining the relationship between stream temperatures and the thermal environment through which streams flow was conducted on the headwaters of 4 tributaries of the Burnt River (Barney, Elk, Greenhorn, and Stevens Creeks) in northeastern Oregon during July through August 1998 and 1999. Barney Creek and Stevens Creek...
Resource Type:: Masters Thesis
Full Text:: . To Dr. Larry Larson and Dr. Michael Borman, thank you for being my co- major professors. Thank you

Describing the thermal regimes of two northeastern Oregon streams

Creator:: Raven, Sonja E.
Abstract:: Two tributaries of the south fork of the Burnt River, near Unity Oregon were studied during the summers of 2000 and 2001 to determine water heating and cooling patterns. Hourly temperature data were recorded for air, water, and soil parameters at four elevations 150m apart on Barney and Stevens Creeks....
Resource Type:: Masters Thesis
Full Text:: thanks go to Mike Borman and Larry Larson, my two major professors, for taking me on and giving me this

Modeling animal movement to manage landscapes

Creator:: Larson-Praplan, Stephanie
Abstract:: Managing rangelands with livestock grazing is a tool that can be applied to obtain vegetation management objectives. Animals utilize available resources, which vary in quantity and quality, across the landscape. Their movements are adjusted to the spatial and temporal heterogeneity of resource distribution. Controlling livestock distribution is fundamental to economically...
Resource Type:: Dissertation
Full Text:: THE DISSERTATION OF Stephanie Larson-Praplan for the degree of Doctor of Philosophy in

The influence of cow age on grazing distribution and utilization of mountain riparian areas and adjacent uplands

Creator:: Morrison, Julie A.
Abstract:: The objective of this study was to evaluate the influence of cow age on grazing distribution relative to mountain riparian areas. In each of two years, sixty cow-calf pairs were stratified by age into the following treatments: 1) thirty first calf heifers (442 kg, body condition score (BCS)=4.5), and 2)...
Resource Type:: Masters Thesis
Full Text:: . Thanks to the other members of my committee, Dr. Callan Ackerman, Dr. Larry Larson, and Dr. Fred

Influence of stocking density on grazing beef cattle performance, diet composition foraging efficiency, and diet quality on a late-spring early-summer native bunchgrass prairie

Creator:: Wyffels, Samuel A.
Abstract:: This study evaluated the influence of cattle stocking density on botanical composition of diet, diet preference, and cattle performance on the Zumwalt Prairie in Northeastern Oregon. In each of two years, 192 cow-calf pairs (549.27 kg, BCS = 4.89) and 48 yearling heifers (383.34 kg, BCS = 5.02) were stratified...
Resource Type:: Masters Thesis

Cottonwood : establishment, survival, and stand characteristics

Creator:: Borman, Michael M., Larson, Larry L., and Oregon State University. Extension Service
Abstract:: Cottonwood provides structural and functional benefits to riparian areas where it is adapted. Cottonwood is adapted to specific growing conditions. If you want to promote cottonwood establishment, it is important to understand its ecology, including site characteristics and conditions required for establishment and survival. This publication is not intended to...
Resource Type:: Technical Report
Full Text:: Extension rangeland resources specialist, and Larry Larson, professor of rangeland resources; Oregon State

Land-grant Universities and Digital Extension Service : a need for partnerships between libraries and extension

Creator:: Schmidt, Larry O.
Resource Type:: Other
Full Text:: Universities and Digital Extension Service A Need for Partnerships between Libraries & Extension Larry

Investigation of polycyclic aromatic hydrocarbons (PAHs) transport by suspended particulate matter (SPM) in the lower Columbia River and its estuary

Creator:: Gregg, Tiffany
Abstract:: This study aims to improve knowledge of how suspended particulate matter (SPM) affects hydrophobic contaminant transport in the lower Columbia River and its estuary, using polycyclic aromatic hydrocarbons (PAHs) as model compounds. It is hypothesized that PAHs are transported to the estuarine turbidity maximum (ETM), a prime feeding zone in...
Resource Type:: Masters Thesis

Polarization spectroscopy and photodissociation studies of nitroaromatic compounds in the gas phase

Creator:: Abbott, James E.
Abstract:: The central purpose of this dissertation was to explore and expand the use of an uniform electric field for orientation and for subsequent spectroscopic investigation of asymmetric polar molecules in the gas phase. The systems of study were nitrobenzene (NB) and the nitrotoluene (NT) isomers. We were able to quantitatively...
Resource Type:: Dissertation
Full Text:: to molecular spectroscopy, John Loeser, Douglas Keszler, and Larry Daley for their guidance and

ScholarsArchive@OSU

The effects of defoliation on yellow starthistle (Centaurea solstitialis L.) reproductive capacity

Elevation, thermal environment, and stream temperatures on headwater streams in northeastern Oregon

Describing the thermal regimes of two northeastern Oregon streams

Modeling animal movement to manage landscapes

The influence of cow age on grazing distribution and utilization of mountain riparian areas and adjacent uplands

Influence of stocking density on grazing beef cattle performance, diet composition foraging efficiency, and diet quality on a late-spring early-summer native bunchgrass prairie

Cottonwood : establishment, survival, and stand characteristics

Land-grant Universities and Digital Extension Service : a need for partnerships between libraries and extension

Investigation of polycyclic aromatic hydrocarbons (PAHs) transport by suspended particulate matter (SPM) in the lower Columbia River and its estuary

Polarization spectroscopy and photodissociation studies of nitroaromatic compounds in the gas phase

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