Index Catalog // ScholarsArchive@OSU

Limitations to Seedling Regeneration on Tropical Forest Restoration Plantations in Northern Thailand

Creator:: Sangsupan, Hathai A.
Abstract:: This dissertation investigated potential ecological limitations to seedling regeneration in young, seasonally dry, evergreen forest restoration plantations in northern Thailand. We explored whether recruitment of colonizing tree species in the restoration plantations can be attributed to seed dispersal mode (i.e. abiotic or animal dispersal) and seed size. We did this...
Resource Type:: Dissertation

Applied nitrogen effects on yellow mustard (Sinapis alba L.) production in the Willamette Valley

Creator:: DuVal, Alyssa Susan
Abstract:: Nitrogen management recommendations for yellow mustard (Sinapis alba L.) production in the high rainfall environment of Oregon's Willamette Valley (WV) are not available. The objectives of this investigation were: (i) to determine the effect of applied nitrogen (N) on seed yield and yield components in yellow mustard, and (ii) to...
Resource Type:: Masters Thesis

Examining ectomycorrhizal communities of ponderosa pine and lodgepole pine in the south-central Oregon pumice zone

Creator:: Garcia, Maria Osuna
Abstract:: Background information is presented that provides historical perspectives on the field of mycology in the Pacific Northwest and its role in forest management. The series of events and decisions that have led to previous studies (or lack of studies) in the field also dictate the directions of current research. Culture,...
Resource Type:: Masters Thesis

Trophic cascades and large mammals in the Yellowstone ecosystem

Creator:: Painter, Luke E.
Abstract:: Reintroduction of wolves to Yellowstone National Park (YNP) in 1995-96 provided a rare opportunity to observe the response of an ecosystem to the return of a top predator, including possible reversal of decades of decline of aspen, cottonwood, and tall willows suppressed by intensive herbivory on elk winter ranges. To...
Resource Type:: Dissertation

Cordeauxia edulis : production and forage quality in central Somalia

Creator:: Ali, Hussein Mohamed
Abstract:: Availability of evergreen forage plants during the two dry seasons in arid central Somalia is very important. Cordeauxia edulis is a multistemmed evergreen legume shrub which grows in Central Somalia in plant communities dominated by deciduous shrubs. There are two growth forms of this plant. A form with small leaflets...
Resource Type:: Masters Thesis

Physical and physiological seed characteristics influencing wheat stand establishment

Creator:: Ahmad, Shahbaz
Abstract:: Rate of emergence is an important character for stand establishment. Ability of wheat seeds to germinate and emerge rapidly under different climatic conditions may be regulated by physical and/or physiological characteristics. Seeds of 26 wheat varieties representing five classes were produced in two different environments (Moro and Corvallis, OR). Seed...
Resource Type:: Dissertation

"The Island" Research Natural Area : a vegetation study with time and location comparisons

Creator:: Fox, M. Anne, 1939-
Abstract:: The purpose of this study was to document vegetation on "The Island", a Research Natural Area at the confluence of the Crooked River and the Deschutes River in central Oregon's Juniperus occidentalis Zone and to compare the results with an earlier study reported in 1964 from 1960-'61 data. Present-day comparisons...
Resource Type:: Masters Thesis

Recruitment predictors of an endangered prairie species : a case study of Erigeron decumbens

Creator:: Gallagher, Katie J.
Abstract:: Preservation of rare plant species often requires establishment of new populations. Survivorship surveys are the most common method of post-introduction monitoring. However, they provide an incomplete picture of establishment success. This study is an attempt to develop a model for determining establishment success by determining the factors affecting recruitment in...
Resource Type:: Masters Thesis

Public perceptions of sagebrush ecosystem management : a longitudinal panel study of residents in the Great Basin, 2006-2010

Creator:: Gordon, Ryan Patrick
Abstract:: Intact sagebrush communities in the Great Basin are rapidly disappearing due to invasion of non-native plants, large wildfires, and encroachment of pinyon pine and juniper woodlands. Land management options include the use of prescribed fire, grazing, herbicides and mechanical treatments to reduce the potential for wildfire and restore plant communities....
Resource Type:: Dissertation

Complexity of food web interactions in a large mammal system

Creator:: Eisenberg, Cristina
Abstract:: Food webs consist of a combination of bottom-up (resource-driven) and top-down (predator-driven) effects. The strength of these effects depends on the context in which they occur. I investigated food web (trophic) relationships between wolf (Canis lupus) predation, elk (Cervus elaphus) herbivory, aspen (Populus tremuloides Michaux) recruitment, and fire. The study...
Resource Type:: Dissertation

ScholarsArchive@OSU

Limitations to Seedling Regeneration on Tropical Forest Restoration Plantations in Northern Thailand

Applied nitrogen effects on yellow mustard (Sinapis alba L.) production in the Willamette Valley

Examining ectomycorrhizal communities of ponderosa pine and lodgepole pine in the south-central Oregon pumice zone

Trophic cascades and large mammals in the Yellowstone ecosystem

Cordeauxia edulis : production and forage quality in central Somalia

Physical and physiological seed characteristics influencing wheat stand establishment

"The Island" Research Natural Area : a vegetation study with time and location comparisons

Recruitment predictors of an endangered prairie species : a case study of Erigeron decumbens

Public perceptions of sagebrush ecosystem management : a longitudinal panel study of residents in the Great Basin, 2006-2010

Complexity of food web interactions in a large mammal system

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