Index Catalog // ScholarsArchive@OSU

Pathological and ecological aspects of decline and mortality of Chamaecyparis nootkatensis in southeast Alaska

Creator:: Hennon, Paul Edward
Abstract:: Alaska-cedar (Chamaecvparis nootkatensIs (D. Don) Spach) is a valuable tree that is suffering from a serious decline and mortality of unknown cause throughout southeast Alaska. Epidemiological and pathological studies were initiated to determine if a pathogen is the primary cause of this problem. By examining old aerial photographs and by...
Resource Type:: Dissertation
Full Text:: . The setting. Forest Service Gen. Tech. Rep. PNW-12. Pacific Northwest Forest and Range Exp. Sta

Canopy epiphyte studies in the central Oregon Cascades : implications for the management of Douglas-fir forests

Creator:: Sillett, Stephen Charles
Abstract:: This thesis includes four separate studies. The first two studies assessed edge effects in a 700-year-old forest. After 20 years of exposure, epiphyte assemblages on the clearcut edge were similar to those of the forest interior, but there were some differences in vertical distribution patterns. Several species restricted to the...
Resource Type:: Dissertation

Phytophthora species and riparian alder tree damage in western Oregon

Creator:: Sims, Laura L.
Abstract:: The genus Phytophthora contains some of the most destructive pathogens of forest trees, including the most destructive pathogen of alder in recent times, Phytophthora alni. Alder trees were reported to be suffering from canopy dieback in riparian ecosystems in western Oregon, which prompted a survey of alder health and monitoring...
Resource Type:: Dissertation

Dry coniferous forests in the Western Oregon Cascades

Creator:: Means, Joseph E.
Abstract:: Pseudotsuga menziesii dominates the forests of the Pacific Northwest. But though it is dominat, Tsuaa heteroohylla or Abies amabilis is usually climax. Many researchers have studied Pseudotsuga on the widespread mesic sites where it is seral, but few have examined the relatively rare ecosystems in which Pseudotsuga or its associate...
Resource Type:: Dissertation
Full Text:: Oakridge 25 Middle third Pseudotsuga/Holodiscus-Ater 560 210 side slope and Pseudotsuga/Berberis/Disporum

Lichen response to the environment and forest structure in the western Cascades of Oregon

Creator:: Martin, Erin P.
Abstract:: Lichens are an important part of the biota in western Oregon forests, where they perform valuable ecological roles and contribute significantly to biodiversity. Lichens in western Oregon are threatened by a number of factors including air pollution and land use practices. If we wish to maintain the persistence of lichens...
Resource Type:: Dissertation
Full Text:: value of elevation (560 m)................................................................. 78 3.7

Community Ecology and Population Genomics of Rhizopogon in the Madrean Sky Island Archipelago

Creator:: Piña Páez, Carolina G.
Abstract:: Anthropogenic induced climate change is predicted to alter distribution of existing plant populations. As plants migrate over space and time, populations often fragment and contract, affecting basic elements of population dynamics (e.g., population size, gene flow, genetic diversity, etc.). Little is known, however, how these impacts on plant species will...
Resource Type:: Dissertation

Evolution and ecology of the Ceanothus-Frankia symbiosis

Creator:: Jeong, Soon-Chun
Abstract:: The evolutionary relationship between Frankia and actinorhizal plants was evaluated by reconstructing molecular phylogenetic trees from nifH, 16S rDNA, and rbcL nucleotide sequences. Subgroupings in Frankia phylogenetic trees reconstructed from nifH and from 16S rDNA sequences were consistent in terms of plant origins of Frankia strains. Although the branching order...
Resource Type:: Dissertation
Full Text:: western forest ecosystems. U.S.D.A. For. Serv. Gen Tech. Rep. PNW -182. '72 pp. Correia, F. F., S. Inouye

A comparative study of temperate Chamaecyparis forests

Creator:: Hawk, Glenn M.
Abstract:: The objectives of this study include: (1) analysis of Chamaecyparis lawsoniana, C. taiwanensis, and C. formosensis forests including the structure, composition, and dynamics of plant communities and their environmental relationships; and (2) comparison of the temperate Chamaecyparis forests of Taiwan and the Pacific Northwest with emphasis on structural and successional...
Resource Type:: Dissertation

Epidemiological insights into Armillaria mellea root rot in a managed Ponderosa pine forest

Creator:: Shaw, Charles G. (Charles Gardner) 1948-
Abstract:: Root rot of ponderosa pine caused by Armillaria mellea was studied in a pine forest that had been under management for 30 years in Klickitat County, Washington. Information sources included disease survey, detailed observation and description of specific disease situations, and examination of roots in situ and removed. Roughly circular...
Resource Type:: Dissertation

Plant communities and succession in Oregon coastal salt marshes

Creator:: Jefferson, Carol A.
Abstract:: The purpose of this study was to determine plant species composition, community structure, successional relationships, vegetational development and plant distributions in estuarine salt marshes on the Pacific Coast of Oregon. Quadrat and transect samples of plant presence and cover, collected from April 1971 - June 1974, were subjected to phytosociological...
Resource Type:: Dissertation
Full Text:: America, extending 560 km from 46°N at the mouth of the Columbia River to California at 42°N. Long

ScholarsArchive@OSU

Pathological and ecological aspects of decline and mortality of Chamaecyparis nootkatensis in southeast Alaska

Canopy epiphyte studies in the central Oregon Cascades : implications for the management of Douglas-fir forests

Phytophthora species and riparian alder tree damage in western Oregon

Dry coniferous forests in the Western Oregon Cascades

Lichen response to the environment and forest structure in the western Cascades of Oregon

Community Ecology and Population Genomics of Rhizopogon in the Madrean Sky Island Archipelago

Evolution and ecology of the Ceanothus-Frankia symbiosis

A comparative study of temperate Chamaecyparis forests

Epidemiological insights into Armillaria mellea root rot in a managed Ponderosa pine forest

Plant communities and succession in Oregon coastal salt marshes

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