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 20 of 27 for “"carbon gain"”.
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The Importance of Fog for Carbon Gain, Water Balance, and Foliar Uptake in Southern Appalachian Cloud Forests
… leaf wetting events can negatively affect carbon uptake by blocking stomatal pores, inhibiting CO2 exchange. Thus, in the southern Appalachian cloud forest ecosystem, the effects of cloud immersion on whole plant physiological ecology, including carbon uptake and water balance needed to be …
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The photoprotective role of thermonastic leaf movements in Rhododendron maximum: potential implications to early spring carbon gain
… during the early spring, when maximum carbon gain is possible. Finally, gas exchange parameters as measured by light and CO2 response curves did not indicate any significant difference between treatment and reference leaves post canopy closure. Out results suggest that TLM are an …
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Untersuchungen zur C, N und S Akquisition durch Viscum album
… einhergeht, kann dieser Anteil am "heterotrophic carbon gain" dem Anteil des "heterotrophic carbon gain" durch den Eintrag organischer Stickstoffquellen gegenüber gestellt werden. <br>Die saisonalen und räumlichen Muster der Aminoverbindungen im Wirtsxylem und in den Organen der Mistel zeigen, …
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The effect of light-limitation on spinescent structural defence and its implications on resistance to herbivory in the shade
… defence or both. The ultimate goal of defence against herbivory is to reduce the amount of damage to biomass, but more specifically to protect against damage to meristematic tissue. The defences employed depend on the type of herbivory experienced, which is contingent on the herbivore and its …
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Coordination of physiological and morphological acclimation of shade-grown tree saplings to late-season canopy gap formation
… and whole-plant level will result in greater carbon gain of saplings exposed to gaps relative to saplings remaining in the shade; that is, shade-developed saplings will acclimate to late-season canopy gaps. Late-season canopy gap formation was simulated by growing potted saplings in the forest …
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Corticular Photosynthetic Dynamics for a Coastal Evergreen Shrub: Myrica Cerifera
… photosynthesis contributes to whole plant carbon gain by reducing respirational CO2 loss. Maximum % refixation was 110 ± 39 % of CO2 efflux in the dark (Rd) in 1st order branches during winter, minimum was 18 ± 3 % in 5th order branches during summer. Variations in % refixation paralleled …
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Investigating variation in the response of photosynthetic traits to ozone pollution in maize
… and ultimately decreases photosynthetic carbon gain. Free Air Concentration Enrichment (FACE) technology is for essential evaluating the photosynthetic response of maize to elevated ozone in field conditions. This project used FACE technology to 1) investigate the heritability of …
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Aspects of the biology of climbers in southern Africa
… climbers compared to trees. Three aspects of the carbon gain capacity (maximum photosynthetic rate, leaf nitrogen concentration and leaf water use efficiency) were compared between climbers and trees. While the climbers had a significantly higher leaf nitrogen concentration than trees, as well as …
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Building A Mechanistic Understanding Of Biodiversity And Ecosystem Functioning In Forests
… slower-growing trees by increasing potential for carbon gain while reducing stress from excess light exposure and disease. Thirdly, I examined relationships between nitrogen cycling and forest productivity, mediated by tree diversity, tree community composition, litter inputs, and soil microbes. …
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Remote sensing-based assessment of Gross Primary Production (GPP) in agricultural ecosystems
… of their role as a strong modifier of regional carbon balance, but also in their intended role of capturing carbon (energy) in the form of food products, e.g. agricultural yield. Gross primary production (GPP) of agricultural ecosystems is the amount of total carbon assimilated by the planted …
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Inhibition of Canopy Tree Seedlings by Thickets of <I>Rhododendron maximum</I> L. (Ericaceae) in an Eastern Deciduous Forest
… of <I>Quercus rubra</I> seedlings to assimilate carbon when exposed to eight consecutive light flecks. <I>Rhododendron maximum</I> thickets altered resource availability for seedlings when compared to areas of forest without <I>R. maximum</I>. Diffused photosynthetically active radiation (PAR) …
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Are local range expansions in southerly populations of Aloidendron dichotomum early indicators of a future range shift?
… of their core range areas. Opposing this, higher carbon gain was found at Gannabos - the cooler of the two study sites. This may be due to the less variable rainfall pattern at Gannabos. Furthermore, performance was higher on the flats where temperatures were also cooler. This may be due to lower …
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Demography and leaf physiology of Cornus drummondii in response to disturbance in tallgrass prairie
… floristic biodiversity and changes in ecosystem carbon, nitrogen, and water relations. In tallgrass prairie, the increased cover and abundance of woody species is typically attributed to human activities such as decreased fire frequency and increased grazing intensity. Clonal shrubs are of …
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Tree Growth and Carbon Balance in a Temperate Forest Exposed to Elevated Carbon Dioxide for Eight Years
… atmosphere have focused attention on the global carbon cycle. Increases in atmospheric CO2 concentrations strongly influence plant carbon uptake and because forests account for the bulk of terrestrial productivity the future role of forests in the carbon cycle is a subject of current scientific …
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The maximum quantum efficiency of CO2 assimilation declines with depth in the canopies of the C4 crops Miscanthus x giganteus and Zea mays
… in both crops, the impact on overall carbon gain at the canopy level is shown to be small.
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The effect of timing of growing season drought on flowering of Andropogon gerardii
… different times via different mechanisms (e.g. carbon gain via rapid growth early in the growing season vs. direct effects on stalk elongation later in the growing season). In order to test the differential effects of precipitation timing, rainfall deficits (100% exclusion) at different periods …
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Plant size and intraspecific variability in vascular epiphytes
… conditions have shown photosynthetic leaf carbon gain as well as respiratory losses of heterotrophic plant parts scaled with plant size. The resulting area related annual carbon balances were similar for plants of varying size, which corresponded to observations of size-independent (and …
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Stomatal sensitivity to photosynthetic and environmental signals in glycine max grown at elevated atmospheric concentrations of CO2 and O3
Rising atmospheric concentrations of carbon dioxide (CO2) and ozone (O3) will stimulate and impair, respectively, yield and productivity of both managed and natural ecosystems in the 21st century. The ease of diffusion of these gases, as well as water vapor, between the atmosphere and interior of …
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QUANTIFYING THE DISTRIBUTION OF FOREST FUNCTIONAL TYPES AND FOREST LEAF AREA INDEX IN THE ALPS
… determining gas exchange (water loss and carbon gain) of alpine forests is Leaf Area Index (LAI). Remote sensing provides a means to estimate LAI over large areas. To map LAI in mountain regions, Landsat TM NDVI index and SR index were examined together with forest inventory data of the …
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Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… at disentangling vegetation impacts on water and carbon cycling of a Mediterranean savanna-type oak woodland. Special focus was laid on the seasonal understory impact on net ecosystem fluxes, soil water distribution and tree-understory interactions. Moreover, the impact of altered precipitation …
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