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 61 for “"Nitrous oxide (N2O)"”.
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The effects of land use, temperature and water level fluctuations on the emission of nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) from organic soil cores in Iceland
… emission of the major greenhouse gases (GHG’s) nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4). The purpose of this study was to gain insight into the influence of temperature, water level and water level fluctuations on the GHG emission of soils representing the three major types of …
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Spring-Thaw Nitrous Oxide Emissions From Reed Canarygrass On Wet Marginal Soil In New York State
… a significant fraction of annual emissions of nitrous oxide (N2O) from agricultural land occurs during soil thaw. The objective of this study is to determine the impact of conversion of long-term fallow grassland to perennial grass bioenergy crops on N2O emissions during spring-thaw, and to …
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The biogeochemistry of marine nitrous oxide
Atmospheric nitrous oxide N2O concentrations have been rising steadily for the past century as a result of human activities. In particular, human perturbation of the nitrogen cycle has increased the N2O production rates of the two major sources of this greenhouse gas, soil and the ocean. …
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Life-cycle assessment of wastewater treatment plants
… to traditional industries with high carbon dioxide (CO2) emissions, such as power plants and transportation. However, the analyses of wastewater treatment plants (WWTPs) have drawn increasing attention, due to the intensive greenhouse gas emissions (GHG) from WWTPs. WWTPs have been listed in …
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Elucidating the Reactivity of Cytochrome P460: Maturation, Product Selectivity, and Substrate Scope
… which oxidizes hydroxylamine (NH2OH) to nitric oxide (NO). Another enzyme expressed by AOB, cytochrome P460, can also oxidize NH2OH but produces nitrous oxide (N2O). The ability of these enzymes to oxidize NH2OH is attributed in part to their unique heme P460 cofactors, which feature additional …
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Impacts of enhanced efficiency nitrogen fertilizers on yield-scaled N2O emissions in Illinois maize
Nitrous oxide (N2O) is a potent greenhouse gas (GHG) with about 300 times the global warming potential of CO2 and significant levels of this GHG come from agriculture. A two-year field experiment was conducted to assess the ability of enhanced efficiency nitrogen fertilizers (EENFs) to minimize …
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Natural variability in eastern tropical Pacific nitrous oxide emissions
Nitrous oxide (N2O) is a powerful greenhouse gas and ozone depleting substance, but its natural sources remain poorly constrained. Marine emissions are likely much higher than IPCC estimates predict, due to unusually high emissions from the oxygen minimum zones (OMZs) in the eastern tropical …
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Mise en place d’un système de mesure par covariance de turbulence des flux de N2O sur une parcelle agricole
Nitrous oxide (N2O) is a greenhouse gas responsible for 8% of anthropogenic radiative forcing. It is also a major contributor to stratospheric ozone depletion. Agricultural soils represent its main source. N2O is produced by microorganisms through nitrification and denitrification processes. Both …
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Development of Ecosystem Structure and Function on Reforested Surface-Mined Lands
… growing season, soil gas fluxes [i.e., carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4)], soil inorganic-N [nitrate (NO3-) and ammonium (NH4+)], and total and active microbial biomass were measured. Soil organic C (SOC) and total ecosystem C are returning to the mined landscape. …
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Impacts of inundation and season on greenhouse gas fluxes from a low-order floodplain
… gases (GHGs). However, important GHGs, carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4), are produced naturally in the soil during the metabolism of many soil microbial and plant communities. The generation rate of GHGs depends on many factors, including soil community composition, …
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Catalytic Reduction of NO and N2O with Hydrogen in Water by Polymer-Protected Palladium Nanoparticles
Nitric oxide (NO) and nitrous oxide (N2O) are important components of the global nitrogen cycle. They are intermediates or end products for natural bacterial processes such as nitrification and denitrification, and are formed in increasing amounts from anthropogenic sources such as increased …
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Evaluating soil productivity and climate change benefits of woody biochar soil amendments for the US Interior West
… while decreasing climate impacts through reduced nitrous oxide (N2O) emissions from fertilizer use and carbon (C) sequestration. This dissertation evaluates such claims for woody biochar applications within the US Interior West; to enhance crop production and reduce N2O emissions in deficit …
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Nitrous oxide and methane emissions from agriculture and approaches to mitigate greenhouse gas emissions from livestock production
… abatement of other N pollutants on emissions of nitrous oxide (N2O); analyse two records of soil temperature from 1976-2010 from Wolverhampton (UK) and Vienna (Austria). Agricultural emissions of GHGs are not readily abated by ‘end of pipe’ technologies. Large decreases in agricultural GHG …
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Sea surface distribution of nitrous oxide and methane in European shelf seas and the Atlantic Ocean
… the amount of the climatically active gases, nitrous oxide (N2O) and methane (CH4), in the troposphere. There are currently uncertainties in quantifying the natural sources and sinks of N2O and CH4 in the marine environment. This thesis presents high-‐resolution surface-‐ocean and …
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Concentration and isotopic composition of marine nitrous oxide, in particular the oxygen-17 isotope excess
… Δ(17O) is a potential tracer of biological nitrous oxide (N2O) cycling. This study presents the first measurements of Δ(17O) in marine N2O together with details about the design and development of a custom-built Gas Chromatography-Isotope Ratio Mass Spectrometry (GC-IRMS) analytical system …
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Correlation Analyses among Soil, Plant, and Environmental Variables and Greenhouse Gas Emissions from Furrow-irrigated Rice on a Silt-loam Soil
… to evaluate correlations between methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2) fluxes and emissions and global warming potential (GWP) and near-surface soil properties and environmental factors over two growing seasons (2018 and 2019) under furrow-irrigated rice on a silt-loam soil …
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Modeling of N2O emission from unmanaged terrestrial ecosystem soils
Nitrous oxide (N2O) is not only an important greenhouse gas, but also impacts stratospheric ozone. Soils under natural vegetation and agriculture are the major sources of N2O through nitrification and denitrification processes. Current estimates of N2O emissions on regional to global scales are …
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Nitrous oxide from denitrification: Influence of field management, environmental conditions, and nutrient availability
… contributes significantly to emissions of nitrous oxide (N2O), a potent greenhouse gas and important ozone-depleting substance. To alleviate this environmental issue, there is a need to explore managements and conditions that minimize N2O emissions from agricultural systems. My work …
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Balancing water quality, nitrogen management, and corn production goals in Illinois
… through nitrate-nitrogen (NO3-N) leaching and nitrous oxide (N2O) emissions, negatively impacting water and air quality, respectively. Given these competing demands, there is a pressing need to develop new strategies for maintaining grain yields and economic returns while decreasing the risk of …
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Tropical stony corals host diverse microbial nitrogen dynamics
… of nitrate reduction, nitrite oxidation, and nitrous oxide (N2O) production in five species of reef-building corals in the Gardens of the Queen, Cuba. Nitrate reduction and nitrite oxidation are present in most species sampled, but ammonium oxidation is low potentially due to photoinhibition …
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