Index Catalog // ScholarsArchive@OSU

Nitrogen dynamics across silvicultural canopy gaps in young forests of western Oregon

Creator:: Thiel, Aaron L.
Abstract:: Silvicultural canopy gaps are emerging as an alternative management tool to accelerate development of complex forest structure in young, even-aged forests of the Pacific Northwest. I investigated patterns of nitrogen (N) availability along transects through 0.1 and 0.4 ha silvicultural gaps in three 50-70 year old Douglas-fir forests of western...
Resource Type:: Masters Thesis
Full Text:: Steven S. Perakis Silvicultural canopy gaps are emerging as an alternative management tool to

Tree species-soils relationships in old-growth forests of the Oregon Coast Range

Creator:: Cross, Alison
Abstract:: Tree species directly and indirectly affect soil nutrient cycles. I sought to characterize soils and foliage associated with four common canopy tree species (Douglas-fir, western hemlock, western redcedar, and bigleaf maple) in mixed-species old-growth forests of the Oregon Coast Range and to determine whether and how soils differ among the...
Resource Type:: Masters Thesis
Full Text:: : __________________________________________________________________ Steven S. Perakis Tree species directly and indirectly affect soil nutrient cycles. I

Activity, composition and structure of soil microbial communities in Savannahshrubs of agroecosystems in semi-arid Senegal

Creator:: Diedhiou, Sire
Abstract:: Piliostigma reticulatum and Guiera senegalensis are two native shrubs that coexist with row crops in parkland systems of the Sahel of Africa. Although permanently green all year around in soil depleted in nutrients and dry for a nine-month period, these shrubs have been largely overlooked. Conventional management of these shrubs...
Resource Type:: Dissertation
Full Text:: : ___________________________________________________________________ Richard P. Dick Piliostigma reticulatum and Guiera senegalensis are two native shrubs that

Genome scale transcriptome analysis and development of reporter systems for studying shoot organogenesis in poplar

Creator:: Bao, Yanghuan
Abstract:: Vegetative propagation allows the amplification of selected genotypes for research, breeding, and commercial planting. However, efficient in vitro regeneration and genetic transformation remains a major obstacle to research and commercial application in many plant species. Our aims are to improve knowledge of gene regulatory circuits important to meristem organization, and...
Resource Type:: Masters Thesis

Electric utility pole yard training facility : Designing an effective learning environment

Creator:: Topping, Robert P.
Abstract:: The primary responsibility of electric utilities is to supply consistent, dependable, and affordable energy to private customers, businesses, and industries. As with many businesses, electric utilities are experiencing the effects of an aging workforce and expending considerable resources to train their current and replacement workers. Community colleges can partner with...
Resource Type:: Dissertation
Full Text:: Facility: Designing an Effective Learning Environment by Robert P. Topping A

Non-linear nitrogen dynamics and calcium depletion along a temperate forest soil nitrogen gradient

Creator:: Sinkhorn, Emily R.
Abstract:: Understanding how N availability influences base cation stores is critical for long-term ecosystem sustainability. Indices of nitrogen (N) availability and the distribution of nutrients in plant biomass, soil, and soil water were examined across ten young, unpolluted Douglas-fir (Pseudotsuga menziesii) stands in the Oregon Coast Range spanning a three-fold soil...
Resource Type:: Masters Thesis
Full Text:: : __________________________________________________________________ Steven S. Perakis Understanding how N availability influences base cation stores is

Four centuries of soil carbon and nitrogen change after severe fire in a Western Cascades forest landscape

Creator:: Giesen, Thomas William
Abstract:: Fire is a major disturbance process in many forests. Long-term studies of the biogeochemical effects of fires, especially on soils, are very rare. Consequently, long-term effects of fire on soils are often hypothesized from short-term effects. In a chronosequence study, I studied 24 western Cascades (Oregon) forest stands thought to...
Resource Type:: Masters Thesis
Full Text:: Severe Fire in a Western Cascades Forest Landscape Abstract approved: Steven S. Perakis

Atmospheric boundary layer coupling to midlatitude mesoscale sea surface temperature anomalies

Creator:: Thum, Nicolai
Abstract:: This thesis examines the mechanisms that couple the monthly-averaged atmospheric boundary layer (ABL) to open-ocean sea surface temperature (SST) perturbations on scales of 50-500 km. The observed positive correlation between surface wind speed anomalies and SST anomalies is successfully simulated using the Weather Research and Forecasting (WRF) model. In numerical...
Resource Type:: Dissertation
Full Text:: : Steven K. Esbensen This thesis examines the mechanisms that couple the monthly-averaged atmospheric

Developing a basis for characterizing precision of estimates produced from non-probability samples on continuous domains

Creator:: Cooper, Cynthia
Abstract:: This research addresses sample process variance estimation on continuous domains and for non-probability samples in particular. The motivation for the research is a scenario in which a program has collected non-probability samples for which there is interest in characterizing how much an extrapolation to the domain would vary given similarly...
Resource Type:: Dissertation

Development of acoustic emissions testing procedures applicable to conventionally reinforced concrete deck girder bridges subjected to diagonal tension cracking

Creator:: Lovejoy, Steven C.
Abstract:: A need exists to develop a non-destructive testing technique that can identify the formation and propagation of diagonal tension cracks in conventionally steel reinforced concrete deck girder (RCDG) highway bridges in the State of Oregon. Such a technique could be included into a structural health monitoring (SHM) system installed on...
Resource Type:: Dissertation
Full Text:: Steven C. Lovejoy for the degree of Doctor of Philosophy in Mechanical Engineering presented on May 30

ScholarsArchive@OSU

Nitrogen dynamics across silvicultural canopy gaps in young forests of western Oregon

Tree species-soils relationships in old-growth forests of the Oregon Coast Range

Activity, composition and structure of soil microbial communities in Savannahshrubs of agroecosystems in semi-arid Senegal

Genome scale transcriptome analysis and development of reporter systems for studying shoot organogenesis in poplar

Electric utility pole yard training facility : Designing an effective learning environment

Non-linear nitrogen dynamics and calcium depletion along a temperate forest soil nitrogen gradient

Four centuries of soil carbon and nitrogen change after severe fire in a Western Cascades forest landscape

Atmospheric boundary layer coupling to midlatitude mesoscale sea surface temperature anomalies

Developing a basis for characterizing precision of estimates produced from non-probability samples on continuous domains

Development of acoustic emissions testing procedures applicable to conventionally reinforced concrete deck girder bridges subjected to diagonal tension cracking

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