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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 76 for “"woody plants"”.
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Colonization of Herbaceous and Woody Plants by Verticillium Dahliae Isolates
Made available in DSpace on 2014-12-14T04:37:45Z (GMT). No. of bitstreams: 1 7913616.pdf: 3340378 bytes, checksum: 2783477f39b4a412fc39371220991b97 (MD5) Previous issue date: 1978
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Stress Predisposition of Woody Plants to Stem Canker Caused by Botryosphaeria Dothidea
Made available in DSpace on 2014-12-14T04:37:47Z (GMT). No. of bitstreams: 1 8004302.pdf: 2304081 bytes, checksum: 6d1611ea0a7703a31360543a2547d1af (MD5) Previous issue date: 1979
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A transient heat probe sensor for measuring transpiration in the stem of woody plants.
… of sap flow through the xylem in the stem of woody plants. This system utilizes a single heated thermistor probe which is alternately and automatically switched between a constant (heating phase) and a variable (cooling phase) temperature mode of operation. Experiments reported here have been …
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Historical ecology of alien woody plants in the vicinity of Cape Town, South Africa
… at the hands of man. Attention is focussed on 13 woody species that are considered to threaten the natural macchia-type vegetation (fynbos) of the region. They comprise Acacia (6 spp.), Albizia lophantha, Hakea (3 spp.) and Leptosperanum laevigatum, all from Australia, and Pinus (2 spp.) from the …
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SURVIVAL IN THE FOREST UNDERSTORY: RESILIENCE AND RESISTANCE TO DAMAGE IN NATIVE AND INVASIVE WOODY PLANTS
<p>Non-native woody plants from Europe and East Asia have invaded intact, low-light forest understories in Eastern North America. Compared to co-occurring native species, invasive species exhibit greater productivity and resource use efficiency, but the extent to which plants are subject to …
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The demographic impacts of browsing on woody plants in savannas : from individual branches to whole populations
… and models outlining mechanisms of impact on plants and predicting responses are framed in terms of biomass impacts and responses. However, for trees in African savannas, fitness is more closely linked to height than above ground biomass. I evaluate the demographic impacts of browsing, making …
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Modelling the current and potential distribution of woody plants, with special emphasis on the importance of spatial scale and environmental factors
… biotic factors in mediating the distribution of woody plants, particularly invasive alien species. Predictions of the future distribution of invasive species are required for management, conservation actions, and legislation. Using predictive geographical modelling, this thesis assesses the role …
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A mathematical model of browse and herbage production in communal grazing lands of semi-arid regions
… . This model is being extended to simulate woody plants in addition to the grass and to simulate browsing by goats. The densities of vegetation and the stocking rates of both types of animals are being considered. Our model (SAVANNAS) will predict animal productivity in relation to rainfall …
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Effects of Plant Invasions on Birds Breeding In Desert Grasslands
Over the past 150 years, encroachment by woody plants and invasions by nonnative grasses have altered the structure and composition of plant communities that once dominated desert and semidesert grasslands. These plant invasions have reduced the quantity and quality of habitat for many …
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Ecosystem Transformation Across a Changing Social Landscape: Landowner Perceptions and Responses to Woody Plant Encroachment
… of rural livelihoods. A global phenomenon, woody plant encroachment (WPE) has been particularly problematic in the Southern Great Plains of the United States where the actions of private landowners are integral to sustaining grasslands. Increased diversity in landowners’ motivations for …
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Composition of the woody plant understory of plateau live oak (Quercus virginiana var fusiformis) clusters in a central Texas savanna
… oak is thought to act as a nurse plant to other woody species on the Edwards Plateau of central Texas; however, little is known of the nature, extent and duration of this facilitation. In this study, a comprehensive assessment of the composition and abundance of understory woody plants in oak …
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Constraints to tree invasion on a nutrient-rich site during old-field succession
… Seed bank density and its concentration beneath woody plants matched patterns observed for seed rain in fields last cultivated in 1968 and 1984. 736 seed traps, monitored monthly for 3$1\over2$ years, collected over 54000 seeds of over 30 plant species. Bird dispersed species were more strongly …
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Studies on aspects of the integrated control of Hakea sericea in the South-western Cape Province, South Africa
Invasion by alien woody plants is a major conservation threat in the sclerophyllous shrubland vegetation of the southwestern Cape Province which is known as fynbos. The Australian shrub, Hakea sericea (Proteaceae)is the most serious threat in mountain fynbos catchments. This study comprises four …
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Shrubs as Sentinels of Ordnance Contamination: Using Plant Physiology and Remote Sensing to Detect TNT in Soils
… and to understand the physiological response of woody plants to 2,4,6-trinitrotoluene (TNT) contamination. Baccharis halimifolia were potted in soils containing various concentrations of TNT and physiological responses were observed over a 9-week experimental period. Measurements included the …
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The effects of different concentrations of phosphite on ectomycorrhiza formation by Pisolithus tinctorius in Castanea dentata
… American chestnut (Castanea dentata) and other woody plants caused by the Oomycete Phytophthora cinnamomi. However, phosphite treatments may negatively affect the plant’s ability to form ectomycorrhizas, the mutualistic symbioses between tree roots and certain soil fungi, and the phosphites …
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THE IMPLEMENTATION OF AN INTEGRATED PEST MANAGEMENT PROGRAM IN A MARYLAND PUBLIC SCHOOL SYSTEM
… in a public school system, an inventory of woody plants was created for 12 schools and key plants and key pests in the landscape were identified. In addition, the use of alternative tactics was examined for the control of insect and weed problems. The cost and efficacy of hand removal of …
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Effects of Natural Enemies and Host Condition on Populations of Insect Pests of Trees
… stems or the large branches or trunks of woody plants. Of the parasitoid species that attack multiple host species, about half are limited to hosts of a single feeding niche, suggesting that some species of parasitoids may be limited in their ability to parasitize hosts of some niches. The …
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