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Dissertations / Theses on the topic 'Nitrogen cycle'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Burgoyne, Calum K. "Parameterisation of a nitrogen cycle model." Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=191768.

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2

Cioncoloni, Giacomo. "Towards an anthropogenic nitrogen cycle based on nitrite." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30717/.

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The overall goal of this thesis was to investigate the feasibility of a new route to anthropogenic nitrogen fixation based on the oxidation of nitrogen (to give primarily nitrite), and then electrocatalytic conversion of nitrite to other N-containing species of interest, such as nitrate and nitric oxide (NO). In pursuit of this goal, the synthesis of metal-ligand coordination complexes that could act as electrocatalysts for the oxidation of nitrite to nitrate was attempted, as was the synthesis of metal-ligand coordination complexes that could act as electrocatalysts for the reduction of nitri

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3

Rahn, Thomas A. "Enrichment of ¹⁵N and ¹⁸O in stratospheric nitrous oxide : observations, experimental results, and implications /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9907828.

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4

Parolari, Anthony Joseph. "The nitrogen cycle and ecohydrology of seasonally dry grasslands." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79491.

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Thesis (Ph. D. in the Field of Hydrology)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 2013.<br>"February 2012." Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 155-172).<br>This thesis addresses the coupling of hydrologic and biogeochemical processes and, specifically, the organization of ecosystem traits with the water, carbon, and nitrogen cycles. Observations from a factorial irrigation-fertilization experiment in a seasonally dry annual grassland are combined with a simple ecosystem model to identify relati

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5

Monteiro, Maria Rovisco Correia Gonçalves. "Dynamic of estuarine prokaryotic communities and the nitrogen cycle." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12738.

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Mestrado em Microbiologia<br>Estuaries are highly dynamic aquatic systems, having steep physical and chemical gradients, such as salinity, influencing microbial communities in terms of their abundance and diversity. The analysis of microbial responses and adaptations to those environmental fluctuations became essential to understand the biogeochemical cycles that regulate these ecosystems, which have been undergoing progressive anthropogenic pressures. In this study, we investigated the dynamics of Archaea and Bacteria diversity along the salinity gradient of the Douro River estuary (NW Portu

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6

Agrella, Karen. "Nitrogen transformations in South African soils." Diss., University of Pretoria, 2001. http://hdl.handle.net/2263/23565.

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7

Moschonas, Grigorios. "Dissolved organic nitrogen dynamics and influence on phytoplankton." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228584.

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A balanced nitrogen (N) cycle is paramount for the ecology and biogeochemistry of planet Earth. Human activities are now causing an imbalance in the N cycle, with several negative effects on the marine environment. However, our knowledge of the marine N cycle remains incomplete, especially with regards to the role of dissolved organic N (DON). Therefore, there is need to study the role of DON more extensively to aid in restoring balance to Earth's ecosystems and biogeochemical cycles. This project investigated DON dynamics and influence on phytoplankton in coastal and shelf seas (CSS) to the w

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8

Tekin, Elif. "Anaerobic Ammonium Oxidation in Groundwater Contaminated by Fertilizers." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23956.

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Anaerobic ammonium oxidation (anammox) is a pathway that has been known for almost 2 decades, but few studies have investigated its importance in natural groundwaters. This thesis investigated the presence of anammox cells and the groundwater geochemistry of 2 sites (Elmira and Putnam) in southwestern Ontario where groundwaters are contaminated with high levels of nitrate and ammonium. Fluorescence in situ hybridization (FISH) was used to quantify the relative abundance of anammox cells in these waters. Our results showed that anammox cells could be detected in many wells at both sites and tha

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9

Franklin, Oskar. "Plant and forest dynamics in response to nitrogen availability /." Uppsala : Swedish University of Agricultural Sciences, 2003. http://diss-epsilon.slu.se/archive/00000345/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2003.<br>Appendix consists of reprints of three papers and a manuscript, three of which are co-authored with others. Includes bibliographical references. Also partially issued electronically via World Wide Web in PDF format; online version lacks appendix.

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10

Mielke, Nora. "The role of nitrogen and phosphorus in carbon and nutrient cycling of bryophyte-dominated exosystems." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231758.

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Bryophytes form an important component of northern vegetation communities. Mosses efficiently capture aerially deposited nutrients, restricting nutrient availability to the soil. Given that key ecosystem processes of northern ecosystems are nutrient-limited, understanding nutrient cycling of the moss layer is key to understanding ecosystem nutrient and C cycling in these systems. However, the role of the moss layer in regulating ecosystem-scale nutrient and C cycling, while potentially significant, is largely unknown. The aim of this thesis is to investigate the effect of the relative availabi

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11

Koikkalainen, Riitta Katariina. "Influence of nitrogen on below ground dynamics in improved grasslands." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=33591.

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12

Coles, Simon Philip. "Automated flow injection instrumentation for monitoring nitrogen species in natural waters." Thesis, University of Plymouth, 1999. http://hdl.handle.net/10026.1/2144.

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The provision of high quality analytical data is an essential prerequisite for understanding the biogeochemical cycling of nutrients in the aquatic environment. Due to the instability of samples collected for nutrient determinations however, in situ analysis is preferred. This approach also allows for high temporal and spatial resolution of the data and alteration of the sampling frequency to meet local environmental needs. Chapter One describes the role of nitrogen species, particularly ammonia and nitrate, in the aquatic environment, their sources, and possible environmental effects and summ

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13

Warren, Victoria. "The temperature dependence of the gaseous products of the nitrogen cycle." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25983.

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The nitrogen cycle is one of the key macronutrient cycles that controls the distribution of life on Earth. The nitrogen cycle is composed of a series of distinct microbially mediated processes which may be affected differently with warming. Climate change is likely to affect all components of the nitrogen cycle. However, the extent to which each component will be affected and how this will alter interactions in natural systems is unknown. Here we used laboratory and field experiments to investigate the effect of warming on nitrogen cycling. We used a combination of pure cultures, in-situ measu

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14

Widener, Andrew Scott. "A mathematical model of the nitrogen cycle in a constructed wetland." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-12172008-063133/.

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15

Emmett, Bridget A. "The effects of harvesting on soil nitrogen transformations in a Sitka spruce (Picea sitchensis (Bong.) Carr.) plantation at Beddgelert forest (N. Wales)." Thesis, University of Exeter, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253559.

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16

Burns, Lisa C. "Cycling of fertiliser-derived N in a Sitka spruce ecosystem after 15N-urea application." Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU545404.

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Low recovery rates of fertiliser N in tree biomass are frequently reported due to the inefficiency of N fertilisers in afforested ecosystems. At Culloden (North East Scotland), only 13&'37 of 15N-urea fertiliser applied to Sitka spruce could be recovered in the above-ground tree biomass two years after fertilisation. Fertiliser N not taken up by trees was largely 'locked-up' in stable organic forms of N within the LFH layers of the soil profile. 15N-labelled litter was used in both field and microcosm experiments, the release and fate of litter-derived-N (LDN) being traced over the course of t

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17

Jamieson, Nicola. "Competition between roots and soil micro-organisms for fertiliser N." Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU548165.

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Low fertiliser recoveries are often found for temperate coniferous forests and appear to be associated with the 'locking-up' of residual fertiliser N in stable organic forms. This phenomenon may well be caused by strong microbial immobilisation, out competing uptake by tree roots. This thesis investigates root/microbe competition for fertiliser-derived N (FDN) in microcosms of coniferous forest soil (supporting Sitka spruce seedlings) as well as in re-seeded blanket peat (supporting a mixed grass pasture). Combinations of selective microbial inhibitors, both with and without either 15N-labelle

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18

Nave, Lucas Emil. "Nitrogen cycling in the northern hardwood forest soil, plant, and atmospheric processes /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196187071.

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19

Sarkodie-Addo, Joseph. "Nitrogen dynamics in a green manure - maize rotation system." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368885.

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20

Sakaguchi, K., X. Zeng, LR Leung, and P. Shao. "Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4)." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/624742.

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Land carbon sensitivity to atmospheric CO2 concentration (bL) and climate warming (gL) is a crucial part of carbon-climate feedbacks that affect the magnitude of future warming. Although these sensitivities can be estimated by earth system models, their dependence on model representation of land carbon dynamics and the inherent model assumptions has rarely been investigated. Using the widely used Community Land Model version 4 as an example, we examine how bL and gL vary with prescribed versus dynamic vegetation covers. Both sensitivities are found to be larger with dynamic compared to prescri

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21

Horak, Rachel Elizabeth Ann. "Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37238.

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Nitrogen fixation is an ecologically important microbial process that can contribute bioavailable combined N to habitats low in N. Shipworms, or wood-boring bivalves, host N2-fixing and cellulolytic symbiotic bacteria in gill bacteriocytes, which have been implicated as a necessary adaptation to an N-poor C-rich (wooden) diet. Shipworm symbionts are known to fix N within the gill habitat and newly fixed N is subsequently incorporated into non-symbiont containing host tissue. The presence of N2-fixation in gill bacteriocytes presents a conundrum because N2-fixation is tightly regulated by oxyge

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22

Zuliani, Filippo. "Nitrogen footprint: development and testing of new methodologies for the assessment of environmental impact related to the nitrogen cycle." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422430.

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The research work addresses the topic of the assessment of environmental impact related to the nitrogen cycle. Starting from an analysis of the environmental effects derived from the alteration of the nitrogen cycle caused by human intervention and of the tools currently available to evaluate these effects, the objective of the research is to develop a new impact assessment methodology, based on an whole Life Cycle Assessment (LCA) approach and to verify its effectiveness in accounting and detailing the environmental impacts caused by a product system and by the related processes. The propose

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23

Kim, Ok-Sun [Verfasser]. "Diversity of functional genes in the aquatic nitrogen cycle / Ok-Sun Kim." Kiel : Universitätsbibliothek Kiel, 2010. http://d-nb.info/101995213X/34.

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24

Arfken, Ann. "The Eastern Oyster Microbiome and its Implications in the Marine Nitrogen Cycle." W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1516639592.

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Microbial communities associated with a particular space or habitat, or microbiomes, play significant roles in host health and the regulation of biogeochemical cycles. In oysters these microbiomes may be important contributors in the removal of biologically available nitrogen (N) from the coastal and marine environment through the process of denitrification. Denitrification is the microbially mediated step-wise reduction of nitrate (NO3-) or nitrite (NO2-) to N2 gas. Excess nitrogen in the Chesapeake Bay has been implicated in the increase of eutrophication and other detrimental effects includ

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25

Yeatman, Stuart Gregory. "Major-ion and isotopic studies of aerosol nitrogen species in the marine atmosphere." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327281.

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26

Hall, Cynthia Adia. "Insights into marine nitrogen cycling in coastal sediments." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28228.

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Thesis (M. S.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2009.<br>Committee Chair: Ellery Ingall; Committee Member: Andrew Stack; Committee Member: Greg Huey; Committee Member: Joseph Montoya; Committee Member: Judith Curry.

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27

Chapman, Jasmin. "The study of the dissolved nitrogen containing macromolecules in the marine environment." Thesis, University of Plymouth, 1988. http://hdl.handle.net/10026.1/1888.

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28

Farmer, Ryan Michael. "Coordination of Carbon Dioxide and Nitrogen Metabolism in Rhodobacter sphaeroides." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365519943.

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29

Stroud, Joanne. "Dinuclear copper complexes with planar, neutral, N-donor, bridging ligands." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282624.

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30

Brandes, Jay Allen Gregory. "Isotopic effects of denitrification in the marine environment /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/11051.

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31

Kreibich, Heidi. "N₂ fixation and denitrification in a floodplain forest in central Amazonia, Brazil." Connect to this title online (Marburg Universität site) Connect to this title online (Deutsche Nationalbibliothek site), 2002. http://archiv.ub.uni-marburg.de/diss/z2002/0398/.

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32

Dale, Olivia R. "Detection, diversity, and activity on anaerobic ammonium oxidizing bacteria (Anammox) in the Cape Fear River Estuary /." Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-1/r1/daleo/oliviadale.pdf.

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33

Bohlen, Lisa [Verfasser]. "Regional and global scale modeling of the benthic marine nitrogen cycle / Lisa Bohlen." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1020284021/34.

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34

Parent, Serge. "The role of meiofauna in the nitrogen cycle of a cold marine mesocosm." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ48110.pdf.

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35

Hamersley, Michael Robert. "The role of denitrification in the nitrogen cycle of New England salt marshes." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/29055.

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Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), February 2002.<br>Vita.<br>Includes bibliographical references (leaves 153-161).<br>I used direct measurements of nitrogen gas (N₂ fluxes and a ¹⁵N stable isotope tracer to determine the contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin. I studied creekbottom denitrification by direct measurements of N₂ fluxes in closed

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36

Sjöberg, R. Michael. "Carbon and nitrogen turnover in the humus layer of coniferous forests with emphasis on immobilisation, stabilisation and uptake processes /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5887-0.pdf.

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37

Fraser, Fiona C. "Temperature responses of nitrogen transformations in grassland soils." Thesis, University of Stirling, 2013. http://hdl.handle.net/1893/17055.

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The current literature shows that global climate is changing with temperatures generally increasing, precipitation patterns becoming less predictable and extreme weather events becoming more frequent. However, the literature is often unclear not only about how changes in temperature will affect soil processes but even about how soil temperatures themselves are changing. This thesis has found that soil temperatures over recent decades have increased at rates comparable to air temperatures (average mean of 0.71 in soil and 0.93 °C in air over the total length of the data sets used). There were d

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38

Gaige, Elizabeth. "Throughfall Dynamics and Canopy Processes in a Nitrogen Fertilized Forest." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/GaigeES2005.pdf.

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39

Currey, Pauline M. "Interactions between atmospheric nitrogen deposition and carbon dynamics in peatlands." Thesis, University of Aberdeen, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165545.

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Most undisturbed peatlands sequester carbon, and rising levels of atmospheric nitrogen deposition may have the potential to destabilize this function, possibly resulting in an increased release of carbon dioxide into the atmosphere. It is therefore of vital importance to investigate further the link between atmospheric nitrogen deposition and carbon dynamics in exposed ecosystems such as peatlands. The work described in this thesis aimed to elucidate the impact of increasing nitrogen on aspects of carbon turnover in peatlands. Using a long-term field-based experiment, I tested the effects of

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40

Au, William R. "Relationships between microbial physiological status and nitrogen availability in forest soils." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21506.

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Although the physiological nitrogen demand of the soil microbial biomass is a major determinant of N mineralization in forest soils, the exact nature of the relationship is unclear. This study investigated the relationships between a respiration-based indicator of microbial physiological N demand (NIR) and N availability in forest soils. NIR was found to correlate significantly with net mineralized N in the field and annual foliar litterfall N fluxes. In a laboratory incubation, NIR was shown to be sensitive to changes in soil available C and N pools. These results demonstrated that microbial

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41

Kim, Dong Yeob. "Municipal wastewater effects on nitrogen cycling in a mature hardwood forest." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/40072.

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Land disposal of municipal wastewater is considered ecologically acceptable and cost effective. The success of land treatment systems, however, requires proper functioning of all ecosystem components. The impact of municipal wastewater irrigation on the structure and function of an Appalachian hardwood forest in Virginia was investigated. Four irrigation rates (17.5, 35, 70, and 140 em yr⁻¹ ) were applied in this hardwood forest, and their effects on forest nutrient cycling were monitored for two years. Tree growth, seedling reproduction, tree mortality, species diversity, and N sequestering b

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42

Eliasson, Peter. "Impacts of climate change on carbon and nitrogen cycles in boreal forest ecosystems /." Uppsala : Swedish University of Agricultural Sciences, 2007. http://diss-epsilon.slu.se/archive/00001525/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2007.<br>Thesis documentation sheet inserted. Includes appendix of four papers and manuscripts, three co-authored with others. Includes bibliographical references. Also issued electronically via World Wide Web in PDF format; online version lacks appendix.

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43

Persson, Jörgen. "Organic nitrogen uptake by boreal forest plants /." Umeå : Dept. of Forest Genetics and Plant Physiology, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/s265-ab.html.

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44

Rattle, Jean. "Dissolved nitrogen dynamics in an ombrotrophic bog." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98773.

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Research for a dissolved nitrogen budget was conducted at Mer Bleue bog near Ottawa, ON, from May 20, 2003 to May 21, 2004. Mer Bleue is located within an area experiencing the highest levels of atmospheric nitrogen deposition in North America, although these levels are only low to moderate compared to those in Europe. Continuous measurements of precipitation, evapotranspiration, bog water table level and outflow water depth were used in conjunction with discrete measurements of precipitation and outflow to determine the hydrologic budget. Water samples were taken from precipitation collectors

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45

Le, Noë Julia. "Biogeochemical functioning and trajectories of French territorial agricultural systems : carbon, nitrogen and phosphorus fluxes (1852-2014)." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS159/document.

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Cette thèse décrit les systèmes de production agricole en termes de flux biogéochimiques d’azote (N), de phosphore (P) et de carbone (C) dans les territoires français de 1852 à 2014 suivant une approche socio-écologique qui permet d’appréhender les logiques qui les gouvernent. Les résultats obtenus mettent en lumière à l’échelle des territoires français le lien systémique entre structures de production, bilans N et P et variations des stocks de C organique dans les sols agricoles. Les systèmes agricoles intensifs et spécialisés engendrent les pertes environnementales et les consommations de re

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46

Lowman, Guy Russell Pollock. "Deposition of nitrogen to grassland versus forested areas in the vicinity of sabie, Mpumalanga, South Africa." Thesis, University of the Witwatersrand, 2003. http://hdl.handle.net/10539/20112.

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Nitrogen deposition to adjacent grassland and forested areas in the vicinity of Sabie, Mpumalanga, South Africa was studied. Total deposition amounts to the forested area are calculated to be 7l.2 kg N ha-1 yr1 and to the grassland area, 25 kg N ha· 1 yr1. The average deposition amounts are similar to or at least approach nitrogen mineralisation amounts at nearby sites of 50-70 kg N ha-1 yr1. The deposition amounts are made up of 21.4 kg N ha-1 yr1 dry deposition, 7.8 kg N ha-1 yr1 wet deposition and 42 kg N ha-1 yr1 cloud droplet deposition for the forest. For the grassland, the amounts

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47

McCaig, Allison E. "16S ribosomal DNA analysis of marine ammonia-oxidising bacteria." Thesis, University of Aberdeen, 1995. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU543307.

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Nitrification is central to the global cycling of nitrogen and is important for primary production and other processes in marine systems, where nitrogen is generally the limiting nutrient. The majority of studies on nitrification, however, have focused on terrestrial systems, where this process can cause significant losses of N-based fertilisers from agricultural land. Comparatively little is known of nitrification in marine systems and the organisms involved. In addition, technical difficulties in isolation of pure cultures of ammonia-oxidising bacteria have severely restricted studies of spe

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48

Graham, Taylor B. "Nitrate recycling versus removal in the Cape Fear River estuary." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-3/grahamt/taylorgraham.pdf.

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49

Thanapakpawin, Porranee. "Spatially-distributed modeling of hydrology and nitrogen export from watersheds /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/9850.

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50

Röing, Kristina. "Soil nitrogen fluxes in Swedish and Nigerian agricultural systems /." Uppsala : Dept. of Soil Sciences, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200557.pdf.

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