Global ETD Search
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 8 of 8 for “"leaf chemistry"”.
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The effects of local-scale resource heterogeneity on tropical tree communities
… of soil resources on spatial variation in leaf chemistry, an important component of ecosystem biogeochemical cycling. I find that leaf nutrient profiles are highly conserved within a species and thus I predict that soil resources are likely to influence community-level variation in leaf …
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Impact of elevated carbon dioxide and increased temperature on Japanese beetle herbivory
… the beetle survivorship, total and per capita leaf consumption, and leaf protease inhibitor activity was measured. The direct effect of temperature on beetle consumption and survivorship was also measured under controlled environmental conditions. No differences in total foliage consumption …
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Influence of cultivar, topping height, and harvest treatment on physical and chemical characteristics of flue-cured tobacco
… tip grade tobacco. Agronomic and cured leaf chemistry data were collected. Cultivar had significant influences on yield, average price, grade index, and value in three growing seasons. NC 71 and RG H51 were the highest yielding cultivars, with grade indices among the highest as well. …
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Pheromones, nectar, and computer vision: investigating large-scale patterns of chemodiversity.
… across taxa, ecological functions of specialized chemistry in plant - pollinator interactions, and methods of automating data collection for monitoring insect diversity. In particular, I investigate the role of specialized nectar chemistry under several existing hypotheses, generate and test novel …
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An investigation into the rapidly induced chemical responses of Myrica gale to insect herbivory
… was found to elicit changes in both the leaf phenolics and the density of volatile oil glands. Lygocoris spinolai, a capsid bug, accounted for most of the observed herbivory. One set of plants (the controls) were kept free of insect herbivores while a second set sustained capsid bug …
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Direct and Indirect Effects of Elevated Carbon Dioxide and Ozone on the Canopy of a Soybean Agroecosystem
… and scale to affect ecosystems. I determined how leaf area index (LAI) was directly affected by elevated [CO 2] and [O3]. By increasing photosynthetic efficiency, elevated [CO2] may increase maximum LAI. However, [O3] accelerates senescence and may reduce LAI. My second objective was to determine …
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Studies of Low-Nicotine Flue-Cured Tobacco Production
… to optimize the yield of high-quality cured leaf while maintaining nicotine levels within a relatively narrow range based on the Regional Minimum Standards Program. Among the 3,000 plus alkaloids found in tobacco, nicotine accounts for greater than 90% of the total alkaloids produced in …
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Changes in Leaf Area and Nutrient Content of Celtis spp. Across a Precipitation Gradient in Texas
… that an increase in precipitation increases leaf size and the C/N ratio, but can decrease leaf nitrogen concentration, thereby increasing the quantity of forage while potentially decreasing quality. I examined whether this prediction held across the longitudinal precipitation gradient of …