Index Catalog // ScholarsArchive@OSU

Effects of herbaceous weed control on young Douglas-fir moisture stress and growth

Creator:: Preest, David Stanley
Abstract:: Profitable, even-aged forest management depends on the early establishment and rapid growth of each new forest crop. These, in turn, require that the young trees have access to an adequate supply of native resources of moisture, nutrients and light. In Mediterranean-type climates, competition for soil moisture is the most serious...
Resource Type:: Dissertation

First-year response of Douglas-fir after release from snowbrush ceanothus

Creator:: Petersen, Terry D.
Abstract:: The release of Douglas-fir from competition with snowbrush (Ceanothus velutinus Dougl.) has often been suggested as a way to improve conifer yield in the western Cascades. This study investigated this possibility by describing changes in the availability of water and light and the response of Douglas-fir to the changing environment,...
Resource Type:: Masters Thesis

The influence of seral Coast Range vegetation on the growth habit of juvenile Douglas-fir

Creator:: Howard, Kerry Megan
Abstract:: A detailed analysis was performed on the juvenile growth of six types of Douglas-fir stock under the influence of typical seral Coast Range vegetation. Objectives were to analyze competitive influences important to the growth of tree seedlings and evaluate differences between stock type characteristics and growth patterns in response to...
Resource Type:: Masters Thesis

Pre-harvest measures to reduce the weight of second-growth Douglas-fir

Creator:: Holt, Harvey Allen
Abstract:: The primary objective of this study is to explore the possibilities of two methods to reduce the weight of small commercial timber prior to logging. The two methods studied are injection of cacodylic acid and sour-felling. Treatments were applied in November, 1965 and May, 1966, with final harvest of the...
Resource Type:: Masters Thesis

Some strategies for controlling the Douglas-fir tussock moth by regulation of budbreak

Creator:: Cobb, Jimmie Osborn
Abstract:: The young larvae of the Douglas-fir tussock moth (Orgyia pseudotsugata (McDunnough) (DFTM) are dependent on the new foliage of its ho'sts (Doug1as-fir, grand fir, white fir) for their food supply. The phenology of the DFTM and its hosts are synchronized, with egg hatch and dispersal occurring one to three weeks...
Resource Type:: Masters Thesis

The inter-relationship of salmonberry and Douglas-fir in cutover areas

Creator:: Allen, Hollis H.
Abstract:: The inter-relationship of salmonberry and Douglas-fir on cutover areas was investigated in the Coast Range of western Oregon. Animal influences affecting the survival of Douglas-fir in a salmonberry habitat were also investigated. The autecology of salmonberry was considered first by formulating a mathematical model to characterize the lateral encroachment of...
Resource Type:: Masters Thesis

Fifth-year growth responses of Douglas-fir to crowding and other competition

Creator:: Cole, Elizabeth C.
Abstract:: This thesis examines the competitive aspects of Douglas-fir trees growing with two commonly associated competitors--red alder and grass--at varying densities. Two Nelder plots in three different environments in the Oregon Coast Range were studied. The sites represented the warm, dry climate of the Willamette Valley; the warm, moist climate of...
Resource Type:: Masters Thesis

Internal moisture relations of standing Douglas-fir trees injected with organic arsenicals

Creator:: Holt, Harvey Allen
Abstract:: Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) ranging from 9.6 to 14.3 inches diameter breast height were treated with the organic arsenicals, monosodium methanearsonate (MSMA) and cacodylic acid. Treatments were applied at monthly intervals from February, 1967 to October, 1968, to ten to 25 trees each month. Treated trees were sampled in...
Resource Type:: Dissertation

Juvenile development of Douglas-fir, red alder and snowbrush associations in Western Oregon

Creator:: El Hassan, Babiker Ahmed
Abstract:: The juvenile development of Douglas-fir, red alder and snowbrush associations was investigated in western Oregon. The relationship between Douglas-fir and red alder was studied and compared in the Coast, Willamette Valley and Cascade regions. Snowbrush- Douglas-fir stands were sampled in the western Cascades. Alder- Douglas-fir relationships were studied on clearcuts...
Resource Type:: Masters Thesis

Competitive interactions between Douglas-fir or ponderosa pine and whiteleaf manzanita

Creator:: White, Diane E.
Abstract:: Juvenile Douglas-fir, ponderosa pine, and whiteleaf manzanita growth in southwest Oregon varied with density of co-developing manzanita and presence of herbaceous cover. Plant xylem pressure potential and stomatal conductance of each species was responsive to competition-induced depletion of soil water. Rates varied among species. The best correlations with growth usually...
Resource Type:: Dissertation

ScholarsArchive@OSU

Effects of herbaceous weed control on young Douglas-fir moisture stress and growth

First-year response of Douglas-fir after release from snowbrush ceanothus

The influence of seral Coast Range vegetation on the growth habit of juvenile Douglas-fir

Pre-harvest measures to reduce the weight of second-growth Douglas-fir

Some strategies for controlling the Douglas-fir tussock moth by regulation of budbreak

The inter-relationship of salmonberry and Douglas-fir in cutover areas

Fifth-year growth responses of Douglas-fir to crowding and other competition

Internal moisture relations of standing Douglas-fir trees injected with organic arsenicals

Juvenile development of Douglas-fir, red alder and snowbrush associations in Western Oregon

Competitive interactions between Douglas-fir or ponderosa pine and whiteleaf manzanita

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