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The intensity of competitive interactions as a function of fertility, in Mediterranean-type old fields in South Australia / Brenton Ladd.Ladd, Brenton M. January 2003 (has links)
"April 22, 2003" / Bibliography: leaves 131-147. / 147 leaves : ill., 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Studies the establishment of tree seedlings in Mediterranean-type oldfields in South Australia to test for a correlation between habitat fertility and the intensity of competition. Also investigates whether resource competition and invertebrate herbivory are confounded with each other. Testing for correlation was carried out using a quantitative literature review in combination with field and glasshouse experiments. Results suggest that direct effects,and indirect effects may be heavily confounded, and that a positive correlation between fertility and the intensity of competition is most probable when a phenomenological definition of competition is used. / Thesis (Ph.D.)--University of Adelaide, School of Environmental Engineering, 2003
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Growth and carbon allocation of red alder seedlings grown over a density gradient /Giordano, Peter A. January 1989 (has links)
Thesis (M.S.)--Oregon State University, 1990. / Typescript (photocopy). Includes bibliographical references (leaves 118-124). Also available on the World Wide Web.
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Variation of carbon allocation and competitive ability of different tree species as related to successional position and habitat /Malavasi, Ubirajara Contro. January 1983 (has links)
Thesis (Ph. D.)--Oregon State University, 1984. / Typescript (photocopy). Includes bibliographical references (leaves 117-125). Also available on the World Wide Web.
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Fifth-year growth responses of Douglas-fir to crowding and other competition /Cole, Elizabeth C. January 1984 (has links)
Thesis (M.S.)--Oregon State University, 1984. / Typescript (photocopy). Includes bibliographical references (leaves 166-176). Also available on the World Wide Web.
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Stand development and individual tree morphology and physiology of young Douglas-fir (Pseudotsuga menziesii) in association with tanoak (Lithocarpus densiflorus) /Harrington, Timothy B. January 1989 (has links)
Thesis (Ph. D.)--Oregon State University, 1989. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.
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Underplanting and competition in thinned Douglas-fir /Brandeis, Thomas James. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 1999. / Typescript (photocopy). Includes bibliographical references (leaves 151-161). Also available on the World Wide Web.
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Belowground competition and response to defoliation of Centaurea maculosa and two native grassesSartor, Karla Anne. January 2005 (has links) (PDF)
Thesis (M.S.)--Montana State University--Bozeman, 2005. / Typescript. Chairperson, Graduate Committee: Catherine A. Zabinski. Includes bibliographical references (leaves 68-74).
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Early competitive interactions between red alder and salmonberry in the Oregon Coast Range /Kelly, Linda Susan. January 1991 (has links)
Thesis (M.S.)--Oregon State University, 1992. / Typescript (photocopy). Includes bibliographical references (leaves 42-46). Also available on the World Wide Web.
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Competitive effects of overtopping vegetation on Douglas-fir morphology in the Oregon Coast Range /Chan, Samuel S. January 1984 (has links)
Thesis (M.S.)--Oregon State University, 1984. / Typescript (photocopy). Includes bibliographical references (leaves 44-46). Also available on the World Wide Web.
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Interactive effects of stripe rust and plant competition in heterogeneous wheat populationsFinckh, Maria Renate 25 October 1991 (has links)
Disease has been implied as an important selective
force acting in plant populations. This study was
conducted to determine the effects of stripe rust (Puccinia
striiformis) on the population dynamics of wheat (Triticum
aestivum) cultivar mixtures.
Five wheat cultivars were grown in pure stands and all
possible mixtures at three and two locations in 1987 and
1988, respectively. In 1989, four replacement series and
their component pure stands were grown in two locations.
All treatments were exposed to or protected from two stripe
rust races. Disease severity and yield were determined on
a per-cultivar basis for mixtures and also for pure stands.
In all but one mixture, disease severity relative to
the pure stands was reduced between 6 and 97%. Disease
severity changes could be separated into two effects:
First, selection for the more resistant or susceptible
genotype reduced or increased disease in mixtures as
compared to their pure stands by up to 47 and 11%,
respectively. Second, epidemiological effects of host
diversity reduced disease severity on individual cultivars
below that of their pure stands. Disease severity on a
genotype was often frequency-dependent. However,
interactions among plant genotypes sometimes appeared to
alter susceptibility and obscured the relationship. Non-diseased
and diseased mixtures yielded 0 to 8% and 8 to 15%
more than pure stands, respectively. overall, mixture
yields were more influenced by plant-plant interactions
than by disease.
Population dynamics over time were studied by applying
variable disease pressure to populations of four wheat
cultivars for one-to-three generations in two locations.
Fitnesses of genotypes were calculated by regressing the
legit of a genotype's frequency on generation. Fitnesses
were affected by disease and location and appeared constant
over time. However, genotype frequency-changes were
negatively correlated with planting frequencies, suggesting
that fitnesses were frequency-dependent. Analysis of data
from longer-term studies in the literature indicated that
three generations may not have been sufficient to detect
frequency-dependence. Stable equilibria may more likely
exist for mixtures of genotypes that are closely related
and adapted to the environment in which they are grown than
for randomly selected genotypes. / Graduation date: 1992
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