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Creator:: Zeigler, Robert S.
Abstract:: This study describes the soils, vegetation and age structure of the Pinus contorta forests of Crater Lake National Park. Growth rates of P. contorta, and levels of infection and impact of dwarf mistletoe (Arceuthobium americanu1r) on growth of P. contorta individuals are compared among communities. Vegetation description is based on...
Resource Type:: Masters Thesis

Creator:: Hawk, Glenn M.
Abstract:: A study of the McKenzie River floodplains, terraces and glacial outwash plains was undertaken to classify and describe the vegetation and soils of a previously little studied synecological unit. During the summer of 1971, 54 analytic vegetation and soil plots (stands) were studied. Cover and frequency of all trees, shrubs,...
Resource Type:: Masters Thesis
Full Text:: acknowledgement is also given to Dr. Donald B. Zobel for his guidance in both the preparation of this thesis and

Creator:: Neil, Garry Allen
Abstract:: A physio-ecological study of Lobaria pulmonaria (L. ) Hoffm. was done to determine if geographic variation occurred within the species. Lobaria pulmonaria was collected from Table Mountain, Oak Creek, and Lost Prairie, located in the Coast Range, Willamette Valley, and Cascade Range respectively in Western Oregon. During 1971 and 1972...
Resource Type:: Masters Thesis
Full Text:: . Donald B. Zobel for his encouragement and continuous guidance during these investiga- tions and

Creator:: Dalton, David Andrews
Abstract:: This study examines several aspects of nitrogen fixation by Purshia tridentata (Pursh) D. C., a rosaceous shrub widespread in the central Oregon pumice region, especially as an understory species in Pinus ponderosa and Pinus contorta forests. Anatomical studies of root nodules under the light microscope revealed strong similarities to other...
Resource Type:: Masters Thesis
Full Text:: wish to express my sincere gratitude to Dr. Donald B. Zobel for his guidance and helpful assistance

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
Full Text:: TEMPERATE CHAMAECYPARIS FORES2 Abstract approved: Redacted for Privacy Donald(B. del The objectives of

Creator:: Keys, Steven Charles
Abstract:: Seedlings from 25 provenances of Abies grandis and Abies concolor were studied at two plantations, 12 at Philomath, Oregon, and 13 at Camino, California. Native seedlings were studied at four of the provenances' field sites. Stomatal infiltration pressure measurements and plant moisture stress measurements were made throughout one summer on...
Resource Type:: Masters Thesis
Full Text:: : Redacted for Privacy Dr. Donald B. Zobel Seedlings from 25 provenances of Abies grandis and Abies

Creator:: Plocher, Milton David
Resource Type:: Masters Thesis
Full Text:: COOS COUNTY, OREGON Redacted for Privacy Abstract approved: Donald 13/. Zobel A study of growth and

Creator:: McNeil, Robert Curlan
Resource Type:: Masters Thesis
Full Text:: , Dr. Donald B. Zobel, who gave his guidance, ideas, encouragement, and time whenever I needed them

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