Index Catalog // ScholarsArchive@OSU

A stand management strategy for young western hemlock-Sitka spruce forests

Creator:: Kellogg, L. D. (Loren D.)
Abstract:: Western hemlock-Sitka spruce forests, where prior precommercial thinning has occurred, constitute one of the most productive young-growth management types along the Pacific Coast from Oregon to southeast Alaska. These stands are ready for a first commercial thinning entry, however, the costs and benefits of such entries and resulting impacts at...
Resource Type:: Dissertation

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

Geographic variation in central Oregon ponderosa pine (Pinus ponderosa Laws.) : seed germination; seed, wing, and cone morphology; seed color

Creator:: Weber, John C., 1948-
Abstract:: Geographic variation was investigated among 225 locations from five geographically disjunct regions in central Oregon. Characters included: germination speed and uniformity in two test environments differing in stratification period and incubation temperature; weight, three dimensions and three 'angles' of seeds; weight and three dimensions of wings; cone length and scale...
Resource Type:: Dissertation
Full Text:: in Central Oregon Ponderosa Pine (Pinus Ponderosa Laws.): Seed Germination; Seed, Wing and Cone

Seasonal estimates of nitrogen fixation by Alnus rubra and Ceanothus species in western Oregon forest ecosystems

Creator:: Kim, Dong Yeob
Abstract:: Two case studies of 5 ecosystems were used to examine the nitrogen fixation rate of red alder (Alnus rubra Bong.), varnishleaf (Ceanothus velutinus var. laevigatus (Hook.) T. & G.), deerbrush (C. i ntegerrimus H. & A.), and snowbrush (C. velutinus var. velutinus Dougl. Ex Hook). The first case study assayed...
Resource Type:: Masters Thesis
Full Text:: Nitrogen Fixation by Alnus rubra and Ceanothus Species in Western Oregon Forest Ecosystems Abstract

Genecology of Douglas-fir from southwestern Oregon

Creator:: White, Timothy L., 1951-
Abstract:: This thesis is divided into three chapters. For all chapters, the experiments described deal with the responses of all or a subset of 72 wind-pollinated Douglas-fir families from 36 different locations in southwestern Oregon. Wind-pollinated seed was collected from each of two trees at each of the 36 locations. The...
Resource Type:: Dissertation

Mycorrhiza formation and diversity in undisturbed forest and clearcut and burned areas in three forest types in Oregon

Creator:: Brainerd, Richard E.
Abstract:: A greenhouse bioassay was used to compare ectomycorrhiza formation and diversity in soils from undisturbed and clearcut and burned areas in moist mesic, moist montane and dry montane forest types representing a gradient of environmental harshness. It was hypothesized that mycorrhiza diversity decreases with increasing environmental harshness and that stability...
Resource Type:: Masters Thesis

Nitrogen status in Oregon Coast Range forest communities

Creator:: Alexander, Joseph Richard
Abstract:: Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) roots in four plant communities--ocean spray (Holodiscus discolor (Pursh). Maxim.)/salal (Gaultheria shallon Pursh), vine maple (Acer circinatum Pursh)/salal, sword-fern (Polystichum munitum (Kaulf.) Presi. var. munitum) and sword-f ern/oxalis (Oxalis oregana Nutt.)--were sampled for soluble nitrogen concentrations. Sampling prior to bud burst in the salal communities...
Resource Type:: Masters Thesis

The role of ectomycorrhizal fungi in ecosystem recovery

Creator:: Amaranthus, Michael P.
Abstract:: The effect of the abundance and rapidity of ectomycorrhiza and root tip formation on conifer seedling survival and growth was investigated on disturbed forest sites in southwest Oregon and northern California. Experiments were conducted over a range of community types and environmental conditions. A range of sources of transfer soil...
Resource Type:: Dissertation

Fire history in three vegetation types on the eastern side of the Oregon Cascades

Creator:: Bork, Joyce L.
Abstract:: Historic fire return intervals in three different vegetation types dominated by ponderosa pine (Pinus ponderosa Laws.) were determined using fire scarred trees. Dendrochronological techniques were used to achieve accuracy in dating fire scars on samples collected from six 40 acre plots established in each site. Mean fire return intervals (MFRI)...
Resource Type:: Dissertation

Tanoak (Lithocarpus densiflorus (Hook & Arn.) Rehd.) root dieback : below- and aboveground site occupancy by stump-sprouts in southwest Oregon

Creator:: Ahrens, Glenn R.
Abstract:: Residual roots from previous stand components are often cited as a major benefit to stump-sprouts of tanoak in southwest Oregon and northern California. Established patterns of belowground carbon allocation and root/shoot maintenance suggest that residual root systems of stumps will be reduced by carbohydrate depletion and root mortality and by...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

A stand management strategy for young western hemlock-Sitka spruce forests

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

Geographic variation in central Oregon ponderosa pine (Pinus ponderosa Laws.) : seed germination; seed, wing, and cone morphology; seed color

Seasonal estimates of nitrogen fixation by Alnus rubra and Ceanothus species in western Oregon forest ecosystems

Genecology of Douglas-fir from southwestern Oregon

Mycorrhiza formation and diversity in undisturbed forest and clearcut and burned areas in three forest types in Oregon

Nitrogen status in Oregon Coast Range forest communities

The role of ectomycorrhizal fungi in ecosystem recovery

Fire history in three vegetation types on the eastern side of the Oregon Cascades

Tanoak (Lithocarpus densiflorus (Hook & Arn.) Rehd.) root dieback : below- and aboveground site occupancy by stump-sprouts in southwest Oregon

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