Index Catalog // ScholarsArchive@OSU

Variation of carbon allocation and competitive ability of different tree species as related to successional position and habitat

Creator:: Malavasi, Ubirajara Contro
Abstract:: Early and late seral tree species were compared for inter-and intraspecific competitive ability; within-population genetic variability; and allocation patterns of soluble sugars and starch seasonally and in response to shade and nitrogen fertilization. Species were Douglas-fir (early seral) and western hemlock (late seral) from a low elevation habitat; and noble...
Resource Type:: Dissertation

Evaluation of allelopathy as a mechanism by which buckwheat suppresses Canada thistle and its mycorrhizae

Creator:: Eskelsen, Steven R.
Abstract:: Experiments were conducted to determine if allelopathy is a mechanism by which buckwheat interferes with a) the growth of Canada thistle and/or b) mycorrhizae colonization in Canada thistle roots. In a competition experiment, buckwheat plant biomass was only affected by the intraspecific competition from other buckwheat plants and not by...
Resource Type:: Dissertation
Full Text:: Canada thistle roots. In a competition experiment, buckwheat plant biomass was only affected by the

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

Effect of density, proportion, and spatial arrangement on the competition of winter wheat and Italian ryegrass (Lolium multiflorum Lam)

Creator:: Hashem, Abul, 1956-
Resource Type:: Dissertation
Full Text:: computation 9 REVIEW OF LITERATURE 10 Nature of plant competition 10 Mechanism of competition 14 Competition

Interactive effects of stripe rust and plant competition in heterogeneous wheat populations

Creator:: Finckh, Maria Renate
Abstract:: 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...
Resource Type:: Dissertation
Full Text:: Interactive effects of stripe rust and plant competition

Stand development and individual tree morphology and physiology of young Douglas-fir (pleudotsuga menziesii) in association with tanoak (Lithocarpus densiflorus)

Creator:: Harrington, Timothy B. (Timothy Brian)
Abstract:: Effects of tanoak (Lithocarpus densiflorus) on early growth, morphology, and physiology of Douglas-fir (Pseudotsuga menziesii) were studied to determine developmental characteristics of young stands and mechanisms of competition. Growth, leaf area, and biomass of Douglas-fir, tanoak, and shrubs / herbs were monitored for six years after establishing a gradient of...
Resource Type:: Dissertation

Models of a four-species annual weed community : growth, competition, and community dynamics

Creator:: Roush, Mary Lynn
Abstract:: Models of weed communities aid in the development of weed management strategies and elucidate the processes and mechanisms that regulate plant populations and communities. A conceptual weed community model was developed to organize key regulatory life-history processes. Specific investigations focused on the processes of plant growth and competition, and relationships...
Resource Type:: Dissertation
Full Text:: investigations focused on the processes of plant growth and competition, and relationships between growth

Growth characteristics and site potentials of perennial grass species

Creator:: Borman, Michael M.
Abstract:: In this study I assessed the potentials of selected, established perennial grasses to maintain site occupancy in the foothills ecosystem of the Rogue River Valley of southwest Oregon which is currently dominated by a variety of annual plants. The first evaluation compared growth curves of the perennial grasses and contrasted...
Resource Type:: Dissertation
Full Text:: maintain their populatiOhs. To assess the potential for competition for available moisture, the second

An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

Creator:: Diop, Amadou Makhtar
Abstract:: Field, screenhouse, and laboratory experiments were conducted to study weed interference in rice grown on hydromorphic soils at the International Institute of Tropical Agriculture (IITA) at Ibadan, Nigeria. Rice and weeds emerged at the same time, 1 week after planting. Weed dry weight was significantly reduced when the crop was...
Resource Type:: Dissertation
Full Text:: on crop yield 15 Methods for studying weed competition 17 Analysis of plant growth 24 Chapter II

Dynamics of size structures : simulation and experiments in seedling stands of Pseudotsuga menziesii and Fraxinus mandshurica

Creator:: Petersen, Terry D.
Abstract:: Computer simulations and experiments were used to determine the basis for skewness and inequality in size structures (frequency distributions of Individual plant sizes) prior to self-thinning mortality. In simulated stands, density-dependent neighborhood heterogeneity caused variability in the growth rate of individuals with the same size, and such variability caused skewness...
Resource Type:: Dissertation

ScholarsArchive@OSU

Variation of carbon allocation and competitive ability of different tree species as related to successional position and habitat

Evaluation of allelopathy as a mechanism by which buckwheat suppresses Canada thistle and its mycorrhizae

Underplanting and competition in thinned Douglas-fir

Effect of density, proportion, and spatial arrangement on the competition of winter wheat and Italian ryegrass (Lolium multiflorum Lam)

Interactive effects of stripe rust and plant competition in heterogeneous wheat populations

Stand development and individual tree morphology and physiology of young Douglas-fir (pleudotsuga menziesii) in association with tanoak (Lithocarpus densiflorus)

Models of a four-species annual weed community : growth, competition, and community dynamics

Growth characteristics and site potentials of perennial grass species

An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

Dynamics of size structures : simulation and experiments in seedling stands of Pseudotsuga menziesii and Fraxinus mandshurica

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