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 23 for “"carbon loss"”.
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Organic emissions during oven drying of wood
… An apparatus was constructed to measure the carbon contained in the evolved organics and to measure the chemical energy content of the organics which evolved at temperatures up to 103°C. Data were collected and used to estimate errors in moisture content measurement. The data were also used …
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The Influence of Urban Soil Rehabilitation on Soil Carbon Dynamics, Greenhouse Gas Emission, and Stormwater Mitigation
… urban soils have potential to provide a carbon sink to mitigate greenhouse gas emission and climate change. However, typical urban land development practices including vegetation clearing, topsoil removal, stockpiling, compaction, grading and building result in degraded soils. In this …
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Essays on Risk and Uncertainty in Greenhouse Gas Trading Markets
A large number of concepts related to carbon offset trading policy are currently being discussed such as baseline, leakage, permanence, monitoring, verification, enforcement, financial feasibility, and third party verification. Cutting across these concepts are a variety of risks and uncertainties. …
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Soil Carbon Dioxide Efflux in a Naturally Regenerated and a Planted Clear-Cut on the Virginia Piedmont
Soils are a major component of the global carbon budget and may serve an important role in mitigating increasing atmospheric CO2 through their capacity to store carbon. In this regard, it is important to evaluate the implications of forest management on changes in carbon cycling and sequestration …
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Hydrologic Controls on Ecosystem Structure and Function in the Great Dismal Swamp
… to more unsaturated conditions resulting in carbon loss through decomposition and increased peat fire frequency and severity. Installation of ditch control structures aim to control drainage and re-establish historical hydrology, vegetation communities, peat accretion rates, and fire regime. …
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Investigation of the Relationship Between Particulate Bound Mercury and Properties of Fly Ash in a Full-Scale 100 MWE Pulverized Coal Combustion Boiler
… mercury concentration (Hgp), unburned carbon, loss on ignition (LOI), elemental content and specific surface area (SSA). Different types of software, such as Microsoft Excel, Minitab and Origin, were applied to build the regression models to evaluate the relationship between Hgp and fly …
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Soil microbial function in a time of global change: effect of dairy antibiotics on soil microbial communities and ecosystem function
… in microbial stress results in elevated soil carbon loss. Chapter 3 shows that antibiotic exposure can change plant function – presumably through impacts on rhizospheric microbial community composition. Plants assimilate more nitrogen, but more carbon is lost from the system overall seemingly …
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Coevolutionary dynamics under anthropogenic impact in intensively managed landscapes
… in the rate and magnitude of water, soil, and carbon fluxes, and hence causes uncertainties in flood prediction, soil fertility, and food security. Understanding the co-evolution of various linked processes of hydrology, geomorphology, and biogeochemistry makes it possible to address the …
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Catalytic upgrading of biomass through the hydrodeoxygenation (HDO) of bio-oil derived model compounds
… along with minimum hydrogen consumption and carbon loss. Current catalytic solutions including zeolites, and conventional hydrotreating catalysts employ high hydrogen pressures, leading to aromatic ring hydrogenation, and hydrogen consumption. This thesis focusses on developing fundamental …
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The Influence of Selection Silviculture Biomass Harvesting on Soil Carbon, Nutrients, and Respiration in a Northern Mixed-Deciduous Forest
… and enhanced decomposer activity can lead to losses of soil C and nutrients, increased nitrification, and reduced soil CO2 efflux (FCO2) from compaction and root senescence. However, results are inconsistent; differences may be linked to insufficient investigation and characterisation of …
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INTEGRATED TERRITORIAL APPROACH FOR SUSTAINABLE AGRICULTURE: NITROGEN MANAGEMENT AND SOIL CARBON SEQUESTRATION IN LOMBARDY REGION
… nitrogen pollution and CO2 emissions caused by carbon loss from soil. That’s particularly true in Lombardy region, due to the presence of more than 27% of cattle and 51% of pigs of the national livestock and due to the extent of area devoted to cereal cropping (about 63% of the utilized …
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Aqueous carbon losses from the Glenfeshie Mòine Mhór
Healthy, functioning peatlands are a net carbon sink and are a globally important terrestrial carbon store alongside numerous other wider ecosystem benefits. Degradation of peatlands by unsustainable management and erosion can increase emissions of carbon dioxide (CO<sub>2</sub>) and methane …
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Scotland’s blue carbon: the contribution from seaweed detritus
… more prominent. Introduction of the term ‘blue carbon’ (BC) has drawn attention to natural coastal habitats and their capacity to fix CO2. The overall aim of this thesis was to place the importance of carbon sequestration within the already essential services that macroalgae provide to the …
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Studies of genera cytophaga-flavobacterium in context of the soil carbon cycle
There is a great need to understand the global carbon cycle; with specific interest in the cycling of soil carbon. This need is two-fold and interconnected. The global climate change is in-part due to the loss of soil organic carbon and the reduced ability of soils to sequester carbon. Also, to …
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Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand
Increasing interest in characterising carbon dynamics in the agricultural landscape has been driven by the clear need for greenhouse gas mitigation strategies in response to global climate change. However, little quantitative information is available about carbon stocks and processes in …
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The influence of hydrodynamics on the growth, erosion and biomechanical properties of Laminaria digitata
… may be significant contributors to blue carbon as it is estimated that ~90% of carbon fixed by macroalgae is transported by water motion and sequestered in coastal or offshore sediments. Macroalgae such as the kelp Laminaria digitata are found in temperate waters growing in the low …
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Role of the thermodynamic regime in ecosystem self-organization and its response to human perturbations
… in negative work, and in some cases, net leaf carbon loss from the ecosystem, both comprising a thermodynamic infeasibility condition. Based on these two components, we conclude that an ecosystem will self-organize towards the most advantageous vegetation structure made possible by …
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Soil Carbon Dioxide Efflux Across Four Age Classes of Plantation Loblolly Pine (Pinus taeda L.) on the Virginia Piedmont
Soil carbon dioxide efflux resulting from microbial and root respiration is a major component of the forest carbon cycle. We undertook this investigation to better understand the nature of soil carbon dioxide efflux of plantation loblolly pine, an important ecological and economical resource in the …
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Mechanistic, Biochemical, and Theoretical Studies of Phototoxicity and Photobluing
… evidence for a previously unexplored 4-carbon truncation reaction that converts the simplest heptamethine cyanine to the corresponding trimethine cyanine. We propose a DFT-supported model describing a singlet oxygen (<sup>1</sup>O<sub>2</sub>) mediated formation of an allene …
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