Index Catalog // ScholarsArchive@OSU

The ecology and management of invasive plant species on tropical islands

Creator:: Hooper, Carolina
Abstract:: Tropical island ecosystems have proven to be inordinately vulnerable to invasions by exotic plants and animals. Today these islands only contain small remnant populations of the original flora and fauna, and these populations are facing increasing pressure from invasive plants. This paper attempts to answer four important questions whose solutions...
Resource Type:: Capstone Project

Management effects on nitrogen nutrition and long-term productivity of western hemlock stands : an exercise in simulation with FORCYTE

Creator:: Sachs, Donald
Abstract:: Regression equations applicable to biomass components of standsof western hemlock [Tsuga heterophylla (Raf.) Sarg.} were developedby destructive sampling of a thinned and an unthinned stand ofwestern hemlock near Seaside, Oregon. Equations predicted more live-branchbiomass and less dead-branch biomass per tree for the thinnedstand, but equations for biomass of foliage, twigs,...
Resource Type:: Masters Thesis

The long term effects of burning on plant succession

Creator:: Kraemer, James Fred
Abstract:: The succession of plants over a period of 25 years was analyzed on clearcut areas in the western Cascades of Washington and Oregon. Thirty-three paired burned and unburned plots were reexamined in 1975. Data were combined with records from prior examinations by Morris (1970). Cover trends of six major brush...
Resource Type:: Masters Thesis

Maturation of noble fir (Abies procera) and grand fir (Abies grandis) seed

Creator:: Snyder, Jeffrey L.
Abstract:: The objectives of this investigation were two-fold: (1) to examine possible seed and cone characteristics and their usefulness as seed maturity indices, and (2) to examine the effects of artificial ripening on seed maturation and germination. Cone fresh weight, cone length, cone specific gravity, cone color, seed fresh weight, seed...
Resource Type:: Masters Thesis

Interspecific carbon transfer in ectomycorrhizal tree species mixtures

Creator:: Simard, S. (Suzanne)
Abstract:: The overall goal of this study was to investigate influences of ectomycorrhizae (EM) and interspecific carbon transfer on seedling performance in species mixtures. The objectives were to: (I) determine the potential for EM to link paper birch and Douglas-fir, (ii) quantify gross and net interspecific carbon transfer, and (iii) evaluate...
Resource Type:: Dissertation

Thinning response in Alnus rubra and Arbutus menziesii : effects of spacing, light, and moisture

Creator:: Kim, Sang-kyun
Abstract:: In western Oregon, hardwood trees occupy 20% of the timberland but account for less than 1% of the timber harvest. Information about how to manage them effectively is limited. The objective of this study was to examine: 1) effect of thinning on tree growth, plant moisture stress, and crown cover...
Resource Type:: Masters Thesis

Underplanting and competition in thinned Douglas-fir

Creator:: Brandeis, Thomas James
Abstract:: Understory conifer regeneration needs to occur beneath conifer-dominated canopies if two-storied or uneven-aged structures are to be considered for western Oregon Coast Range stand management. To ensure adequate numbers of seedlings to meet stocking or habitat structure objectives, planting may be a solution. We undertook a multi-level study to determine...
Resource Type:: Dissertation

Genetics of fall, winter and spring cold hardiness in coastal Douglas-fir seedlings

Creator:: O'Neill, Gregory Arthur, 1961-
Resource Type:: Dissertation

Effects of vegetation and soil organisms on soil nutrient dynamics in subalpine Abies lasiocarpa forests

Creator:: Johnson, Kathleen A., 1955-
Abstract:: The broadest goal of the research covered in this thesis was to contribute to our limited knowledge of high elevation forest soil ecology. Based on the reeds of funding agencies, specific objectives were to examine 1) how climate-induced Abies lasiocarpa ([Hook.] Nutt.) forest expansion affects soil nutrient pools, 2) the...
Resource Type:: Dissertation

Effects of canopy gaps in Douglas-fir forests and resource gradients on fecundity and growth of understory herbs

Creator:: St. Pierre, Elizabeth A. (Elizabeth Ann)
Abstract:: Effects of small-scale disturbances on fecundity and growth rates of Linnaea borealis L., Tiarella trifoliata L. var. unifoliata, and Trillium ovatum Pursh. were studied in old-growth forests in the Tsuga heterophylla Zone on the west slope of the Cascade Mountain Range of Oregon. Performance of each species was compared in...
Resource Type:: Dissertation

ScholarsArchive@OSU

The ecology and management of invasive plant species on tropical islands

Management effects on nitrogen nutrition and long-term productivity of western hemlock stands : an exercise in simulation with FORCYTE

The long term effects of burning on plant succession

Maturation of noble fir (Abies procera) and grand fir (Abies grandis) seed

Interspecific carbon transfer in ectomycorrhizal tree species mixtures

Thinning response in Alnus rubra and Arbutus menziesii : effects of spacing, light, and moisture

Underplanting and competition in thinned Douglas-fir

Genetics of fall, winter and spring cold hardiness in coastal Douglas-fir seedlings

Effects of vegetation and soil organisms on soil nutrient dynamics in subalpine Abies lasiocarpa forests

Effects of canopy gaps in Douglas-fir forests and resource gradients on fecundity and growth of understory herbs

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