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Dissertations / Theses on the topic 'Carbon and nutrients'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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1

Chalmers, Neil George. "The demand for low carbon food products." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/17068.

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The emissions associated with food consumption make up approximately 20-30 percent of Scotland’s total greenhouse gas emissions (GHG). Reducing demand for high carbon footprint food products may provide an effective instrument for reducing GHG emissions. However, there is concern that using consumption based taxes may also have negative consequences on nutrition. Therefore, this thesis investigates the likely effect of carbon consumption taxes on GHG emissions and the resulting impact on nutrient consumption. The data used for the analysis are the Scottish part of Kantar Worldpanel data for th
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2

Guerrero, Camacho Francisco Javier. "Improving ebpr stability in wwtps aiming at simultaneous carbon and nutrient removal: from modelling studies to experimental validation." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283648.

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L’eliminació biològica de nutrients (EBN) a les estacions depuradores d’aigües residuals (EDARs) es considera el procés més rentable y mediambientalment més respectuós per a prevenir l’eutrofització i complir amb els cada cop més restrictius límits d’abocament. L’eliminació biològica de nitrogen (N) ha estat àmpliament estudiada i implementada en nombroses EDARs, tant urbanes com industrials. Contràriament, per a l’eliminació biològica de fòsfor, P, (procés EBPR) no existeixen encara molt exemples de la seva aplicació a escala real, principalment degut a l’aparició de fallades no esperades qua
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3

VERONESI, DAVIDE. "MICROALGAE PRODUCTION RECOVERING CARBON AND NUTRIENTS FROM AGRO-INDUSTRIAL WASTES." Doctoral thesis, Università degli Studi di Milano, 2018. http://hdl.handle.net/2434/603128.

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Abstract In the last decades several companies worldwide pain significant interest on microalgae production biotechnology as these microorganisms are able to produce high added value compounds such as lipids and polyunsaturated fatty acids, proteins and essential amino acids, antioxidants and pigments that could be used in several sectors, i.e. food, feed, green chemistry, cosmetical, nutraceutical and pharmaceutical industries and bio-energy field. Nowadays, autotrophic cultivation is the main modality in which microalgae are industrially produced, but its success is limited by factors such
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4

Faithfull, Carolyn. "Productivity and carbon transfer in pelagic food webs in response to carbon, nutrients and light." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-43467.

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Some of the major problems we face today are human induced changes to the nitrogen (N), phosphorus (P) and carbon (C) cycles. Predicted increases in rainfall and temperature due to climate change, may also increase dissolved organic matter (DOM) inflows to freshwater ecosystems in the boreal zone. N, P, C and light, are essential resources that most often limit phytoplankton (PPr) and bacterial production (BP) in the pelagic zone of lakes. PPr and BP not only constitute the total basal C resource for the pelagic aquatic food web, but also influence ecosystem function and biogeochemical cycles.
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5

Asandei, Ancuta. "Global warming : carbon-nutrient interactions and warming effects on soil carbon dynamics." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/17537.

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In order to predict how terrestrial ecosystems will respond to global change, there is growing recognition that we need to better understand linkages between plant and soil processes. Previously the factors and processes with potential to influence the terrestrial carbon (C) cycle have been investigated in isolation from each other. This study investigated the interactions of nutrient availability and warming in controlling the soil carbon dynamics, with regards to the fate of already sequestered carbon in soil, under conditions of increasing atmospheric temperatures. The project objectives we
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6

Dotto, Marciane Cristina. "Balanço de carbono e nutrientes solo/planta em plantios de palma-de-óleo (Elaeis guineenses), na Amazônia oriental." Universidade Federal do Tocantins, 2017. http://hdl.handle.net/11612/877.

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O Brasil produz cerca de 340 mil toneladas de óleo-de-palma. A maior parte provém do território paraense que representa cerca de 90% da produção nacional de óleo-de-palma, com 160 mil hectares plantados em função da aptidão edafoclimática da região que possui condições favoráveis para o desenvolvimento da cultura. Diante da relevância desta cultura, os estudos aqui realizados foram conduzidos com o objetivo de fornecer informações sobre os aspectos fisiológicos, quantificação de biomassa, estoque de carbono e balanço nutricional em plantios de palma-de-óleo com 3, 4, 5, 6 e 7 anos de idade. As
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Elsey-Quirk, Tracy. "Inter- and intraspecific variation in carbon and nutrient pools of salt marsh plants." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 236 p, 2010. http://proquest.umi.com/pqdweb?did=1993336371&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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8

Murali, Narasimhan Anand. "Microalgal bioremediation of nutrients in wastewater and carbon dioxide in flue gas." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/Murali_Narasimhan_09007dcc807bb7a4.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2010.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed June 17, 2010) Includes bibliographical references (p. 67-77).
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9

Parkes, Duncan James. "Storage and cycling of organic carbon and nutrients in Holocene coastal sediments." Thesis, University of East Anglia, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396713.

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Geochemical analyses of Holocene coastal sediments from eastern England were made to better understand the cycling of organic carbon and nutrients in the coastal zone in the past, present and future. Sediments and peat were deposited in freshwater marshes, saltmarshes and intertidal mud- and sand-flat environments that were much more extensive during the Holocene than they are at present. The reduction in these areas, largely through human activities, has decreased the potential annual accumulation and storage of organic carbon, nitrogen and phosphorus associated with sediments. While the carb
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10

Shurtz, Benjamin K. "Nutrient and Carbon-Dioxide Requirements for Large-Scale Microalgae Biofuel Production." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1759.

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Growing demand for energy worldwide has increased interest in the production of renewable fuels, with microalgae representing a promising feedstock. The large-scale feasibility of microalgae based biofuels has previously been evaluated through technoeconomic and environmental impact assessments, with limited work performed on resource requirements. This study presents the use of a modular engineering system process model, founded on literature, to evaluate the nutrient (nitrogen and phosphorus) and carbon dioxide resource demand of five large-scale microalgae to biofuels production systems. Th
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11

Bown, Horacio E. "Representing Nutrition of Pinus Radiata in Physiological Hybrid Productivity Models." Thesis, University of Canterbury. School of Forestry, 2007. http://hdl.handle.net/10092/1210.

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Hybrid physiological models are being increasingly used to assess productivity, carbon sequestration, water and nutrient use and environmental impacts of management decisions. Users include forest managers, politicians, environmental agencies and scientists. However a wider use of these models has been prevented as a result of an incomplete understanding of the mechanisms regulating carbon allocation, nutrient availability in soils and nutrient uptake by trees. On-going innovation in clonal forestry, genetic improvement and vegetation management techniques is also poorly represented in hybrid
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12

Craig, Nina Genevieve. "Properties and Potentials of Coal Mine Soils in Southwest Virginia 29 Years After Establishment." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19255.

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Current reclamation research following surface mining in the Appalachian coal region seeks to measure carbon (C) and nutrient accumulation and retention under forest vegetation to better understand the role of reforestation in the re-establishment of these ecosystem services. This study capitalized on the Controlled Overburden Placement Experiment (COPE), a 29-year-old reclamation research installation in southwestern Virginia, to estimate long-term mine soil C sequestration potentials and nutrient capitals after different reclamation strategies. The COPE includes two studies, a rock mix study
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13

Rufino, Ana Maria Martins [UNESP]. "Estoque de carborno em solos sob plantios de eucalipto e fragmento em Cerrado." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/99768.

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Made available in DSpace on 2014-06-11T19:30:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-05-28Bitstream added on 2014-06-13T20:40:16Z : No. of bitstreams: 1 rufino_amm_me_botfca.pdf: 2747239 bytes, checksum: cdbcc49d429a0f7df7aba9d1fac59f81 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>O sequestro de carbono nos ambientes terrestres, sendo feito de forma natural pelos vegetais através da fotossíntese, cujo processo permite fixar o carbono nos solos e, em forma de matéria lenhosa nas plantas, vem sendo apontado como uma alternativa mitigadora das muda
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14

Belmont, Jonathon. "The study of carbon and nutrients in forests : a foundation for examining global change /." [Bloomington, Ind.] : Indiana University, 2004. http://wwwlib.umi.com/dissertations/fullcit/3162225.

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Thesis (Ph.D.)--Indiana University, School of Public and Environmental Affairs, 2004.<br>Title from PDF t.p. (viewed Dec. 1, 2008). Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0177. Chair: J. C. Randolph.
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15

Fernández-Martínez, Marcos. "On the role of nutrients, climate and anthropogenic impacts in spatio-temporal variability of forest productivity." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/385914.

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Els boscos són dels ecosistemes terrestres més importants en termes de fotosíntesi i segrest de carboni, perquè n’acumulen i en segresten en grans quantitats, com a biomassa i com a matèria orgànica del sòl. A més, els boscos proporcionen polsos de recursos, a traves de la producció de fruits, que poden comportar efectes en cascada a través de la xarxa tròfica de l’ecosistema. L’objectiu d’aquesta tesi és caracteritzar l’estructura i el funcionament dels boscos i quantificar llurs productivitats ecosistèmiques. La nostra recerca s’ha centrat en entendre els controls del balanç de carboni i de
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16

Pan, Xi. "The marine biogeochemistry of dissolved organic carbon and dissolved organic nutrients in the Atlantic Ocean." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/63139/.

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The marine biogeochemistry of dissolved organic carbon (DOC) has come under increased scrutiny because of its involvement in the global carbon cycle and consequently climate change. Dissolved organic nitrogen (DON) and phosphorus (DOP), which have historically been ignored because of their suggested “biological unavailability”, have now received greater attention due to their importance in nutrient cycling, particularly in oligotrophic ecosystems. DOM, a byproduct of photosynthetic production, has important ecological significance as a substrate that supports heterotrophic bacterial growth, th
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17

Woodward, Kenneth Benjamin. "The Storage, Mobilisation and Metabolism of Soil Nutrients and Carbon in an Australian Lowland River." Thesis, Griffith University, 2015. http://hdl.handle.net/10072/366245.

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More than 45 000 dams, with the capacity to hold 15% of global river runoff, have been constructed on rivers around the world for diverse purposes including water supply, irrigation water and power. The effects of these dams on river flow are diverse and dependent upon the purpose of the dam; some dams stabilise flow to improve transportation, water access and agricultural productivity, while dams such as those for power generation create flow regimes that vary drastically over a period of hours. The benefits of regulating river flow for human needs comes with ecological costs to riverine ecos
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18

Terhaar, Jens. "Effects of river delivery of nutrients and carbon on the biogeochemistry of the Arctic Ocean." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/287713/3/Main.pdf.

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Coastal oceans play an important role in the carbon cycle and are hotspots of ocean primary production and ocean acidification. These coastal regions are strongly influenced by rives, especially in the Arctic. Despite the importance of the riverine delivery of carbon and nutrients, their effect on the Arctic Ocean is still poorly understood due to hostile conditions and the consequently low number of observations. This thesis aims at improving our understanding of the influence of Arctic riverine delivery of carbon and nutrients by using ocean biogeochemical models.The first part of the thesis
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19

Wisebaker, April R. "The Impact of Nutrient Availability and Algal Community on Carbon Isotope Fractionaion in Crystal Lake, Clark County, Ohio." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1215397666.

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20

Watanabe, Kenta. "Biological production and carbon sequestration functions in estuarine and coastal ecosystems." Kyoto University, 2019. http://hdl.handle.net/2433/242894.

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21

Suratman, Suhaimi Bin. "The seasonal distribution and cycling of nitrogen and organic carbon-based nutrients in the North Sea." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442538.

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22

Lacroix, Fabrice. "Riverine and coastal ocean contributions to the global and regional oceanic cycling of carbon and nutrients." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/289460/3/main.pdf.

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Les rivières sont une source importante de constituants biogéochimiques pour les océans. Jusqu’à présent, les modèles océaniques globaux représentaient de manière inadéquate ou ignoraient simplement les apports continentaux de nutriments, de carbone, d’alcalinité provenant des rivières. En particulier, les perturbations anthropiques des apports fluviaux au cours du 20 ème siècle et leurs conséquences sur l’état physique et biogéochimique des océans - notamment la zone côtière - n’ont pas encore été analysées à l’aide d’un modèle global prenant en compte la circulation tridimensionnelle de l’oc
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23

Hebert, Andrew Brian. "Diagenesis in seagrass vegetated sediments: biogeochemical processes on diurnal time scales." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2712.

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Seagrass productivity is largely limited by nutrient and light availability. However, increasing evidence suggests that sedimentary geochemical processes may play an essential role in seagrass productivity/health. Much of this work has been largely phenomenalistic and has not clearly identified the spatio-temporal behavior of the major geochemical parameters involved in diagenesis of seagrass sediments. In this study, a much broader range of both dissolved and solid phase chemical parameters in eelgrass vegetated sediments was investigated. Parallel measurements were made on adjacent unveg
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24

Lira, Ana Cláudia Silva de. "Lodo de esgoto em plantações de eucalipto: carbono, nitrogênio e aspectos da fotossíntese." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-23112006-122756/.

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O tratamento de esgoto gera um resíduo, o lodo de esgoto, que tem potencial para promover o crescimento de plantas e aumentar a produtividade de cultivos. O objetivo geral do trabalho desenvolvido foi avaliar como esse resíduo aplicado em plantações de eucalipto altera os estoques de C e N, aspectos do processo fotossintético, da área e nutrientes foliares. O estudo foi conduzido na estação experimental de Itatinga - ESALQ/USP, com aplicação de doses até 40 t/ha de biossólido para cultivo de Eucalyptus grandis. Considerando a biomassa total acima do solo, os eucaliptos que receberam 10 t/ha de
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25

Crawford, Joseph L. "Effects of Inorganic Nutrients and Dissolved Organic Carbon on Oxygen Demand in Select Rivers in Northern Utah." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1959.

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Sewage, agricultural runoff, and atmospheric deposition have greatly increased the amount of nutrients (largely nitrogen (N) and phosphorus (P)) in surface water nationwide. Excess nutrients are associated with algal blooms and dissolved oxygen depletion in many water bodies, but linkages between nutrients and dissolved oxygen have been largely correlative. Biochemical oxygen demand (BOD) is a regulated water quality parameter that is aimed at describing the amount of oxygen consumed during the decomposition of organic matter. Despite the awareness that excess nutrients are linked to dissolved
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26

Duncan, Brittany L. "Impacts of Cattle Grazing as a Tool to Control Phragmites australis in Wetlands on Nitrogen, Phosphorus, and Carbon." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7420.

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Phragmites australis is a plant that is causing problems in wetlands by outcompeting native plants that provide food and shelter for millions of migratory birds. Currently, managers try to control Phragmites australis by spraying herbicide, burning, and mowing, but these methods are costly, time consuming, and have low levels of success. Adding grazing as a tool to control Phragmites australis provides a cheap and low labor alternative. However, there are many concerns regarding if grazing will cause nutrient loading in our wetlands that will decrease water quality and alter beneficial functio
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27

Townsend, John Andrew. "Effects of elevated carbon dioxide, water and nutrients on the growth and physiology of Picea sitchensis (Bong.) Carr." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358802.

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28

Finch, Stewart James. "Physiological regulation of photosynthesis and oxygen consumption in the coccolithophorid Emiliania huxleyi to light, nutrients and carbon dioxide." Thesis, University of Essex, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720567.

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29

Ciuk, Karlsson Susanna. "Modeling of bark-, sand- and activated carbon filters for treatment of greywater." Thesis, Energi och Teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-187078.

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ABSTRACT Modeling of bark-, sand- and activated carbon filters for treatment of greywater Susanna Ciuk Karlsson   The part of the waste water produced in a household, originating from showers, dish - and wash water, is called greywater. It is possible to treat the greywater separately from the black water (toilet water) as it is less polluted and then use it for purposes such as garden irrigation. There are various methods for purifying greywater. Here, the possibility to purify greywater using three column filters with different materials (activated carbon, pine bark and sand) was examined th
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Denfeld, Blaize Amber. "Greenhouse Gas Dynamics in Ice-covered Lakes Across Spatial and Temporal Scales." Doctoral thesis, Uppsala universitet, Limnologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-275018.

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Lakes play a major role in the global carbon (C) cycle, despite making up a small area of earth’s surface. Lakes receive, transport and process sizable amounts of C, emitting a substantial amount of the greenhouse gases, carbon dioxide (CO2) and methane (CH4), into the atmosphere. Ice-covered lakes are particularly sensitive to climate change, as future reductions to the duration of lake ice cover will have profound effects on the biogeochemical cycling of C in lakes. It is still largely unknown how reduced ice cover duration will affect CO2 and CH4 emissions from ice-covered lakes. Thus, the
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Klinka, Karel, Pal Varga, and Christine Chourmouzis. "Quantitative characterization of field-estimated soil nutrient regimes in the coastal forest." Forest Sciences Department, University of British Columbia, 1999. http://hdl.handle.net/2429/702.

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One of the key factors in the site classification of the biogeoclimatic ecosystem classification is soil nutrient regime. Soil nutrient regime (SNR) represents the amount of essential soil nutrients available to plants over a period of several years. SNRs classes are assessed based on field identifiable (qualitative) criteria, not using quantitative measures. There have been several studies that attempted to quantitatively characterize regional soil nutrient gradients in the Coastal Western Hemlock (CWH) zone. In the study summarized here, the soils are influenced by a perhumid cool mesotherma
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Graham, Tabitha. "INVESTIGATION OF MEDIA INGREDIENTS AND WATER SOURCES FOR ALGAE CO2 CAPTURE AT DIFFERENT SCALES TO DEMONSTRATE THE CORRELATIONS BETWEEN LAB-SCALE AND LARGE-SCALE GROWTH." UKnowledge, 2013. http://uknowledge.uky.edu/bae_etds/16.

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As energy use increases globally the environmental burdens increase alike. Many accusations have been made that carbon dioxide is a culprit of climate change. The University of Kentucky and Duke Energy Power have partnered to test carbon capture technology in a large scale project. To this end, the objective of this thesis is to investigate potential water media sources and nutrient sources at different volume scales for algae cultivation to help create a more environmentally viable and economically feasible solution. This work will conduct a life cycle assessment of water media sources and th
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33

Basapuram, Laxmi Gayatri Devi. "Lake Victoria - Carbon, Nitrogen, Phosphorus and Stable Isotope (δ13C) comparison between lake and catchment sediments". Thesis, Linköpings universitet, Tema Miljöförändring, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149283.

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Lake Victoria situated in East Africa faces an acute problem with eutrophication. Many reasons like agricultural production, industrialization, anthropogenic processes, the introduction of species, and economic activities have caused a stress to the overall well-being of the lake. Excess carbon, nitrogen, and phosphorus drive an increase in productivity which affects eutrophication. Previous studies on sediments and nutrient concentrations in the lake have concluded that nutrient concentrations increase due to release from the catchment. This study focuses on catchment sediments collected from
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34

Rufino, Ana Maria Martins 1977. "Estoque de carborno em solos sob plantios de eucalipto e fragmento em Cerrado /." Botucatu : [s.n.], 2009. http://hdl.handle.net/11449/99768.

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Resumo: O sequestro de carbono nos ambientes terrestres, sendo feito de forma natural pelos vegetais através da fotossíntese, cujo processo permite fixar o carbono nos solos e, em forma de matéria lenhosa nas plantas, vem sendo apontado como uma alternativa mitigadora das mudanças climáticas, segundo acordos internacionais como o Protocolo de Kyoto. A retirada da floresta nativa provoca a diminuição significativa da biomassa microbiana e da fertilidade do solo. A reserva de carbono na matéria orgânica do solo é uma importante estratégia para atenuar a concentração de CO2 na atmosfera. Com o re
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35

Ometto, Francesco. "Microalgae to energy : biomass recovery and pre-treatments optimisation for biogas production integrated with wastewater nutrients removal." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/8403.

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The increasing concern about water quality and energy demand promotes the development of innovative and low-cost processes to improve the nutrient uptake and energy efficiency of existing wastewater treatments (WWT). In this context, the inclusion of a microalgae system (MAS) in the flowsheet of a WWT plant represents a sustainable alternative to conventional technologies, as it combines a low-cost nutrient uptake system with the production of biomass suitable for biofuel production. However, at present, the energy required to cultivate and process the algae cells is often too high to justify
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Henley, Sian Frances. "Climate-induced changes in carbon and nitrogen cycling in the rapidly warming Antarctic coastal ocean." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7626.

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The western Antarctic Peninsula (WAP) is a hotspot of climatic and oceanographic change, with a 6°C rise in winter atmospheric temperatures and >1°C warming of the surface ocean since the 1950s. These trends are having a profound impact on the physical environment at the WAP, with widespread glacial retreat, a 40% decline in sea ice coverage and intensification of deep water upwelling. The main objective of this study is to assess the response of phytoplankton productivity to these changes, and implications for the marine carbon and nitrogen cycles in the WAP coastal zone. An extensive suite o
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Willich, Melanie [Verfasser]. "Leaching of Carbon and Nutrients on a Subtropical Sandy Soil from Northern Oman - A Comparison of Methods and Amendments / Melanie Willich." Kassel : Universitätsbibliothek Kassel, 2014. http://d-nb.info/1061014924/34.

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Yang, Ying. "Effects of Temperature, Light Intensity and Quality, Carbon Dioxide, and Culture Medium Nutrients on Growth and Lipid Production of Ettlia oleoabundans." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/42.

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Ettlia oleoabundans, a freshwater green microalga, was grown under different environmental conditions to study its growth, lipid yield and quality for a better understanding of the fundamental physiology of this oleaginous species. E. oleoabundans showed steady increase in biomass under low temperature and low light intensity, and at high temperature lipid cell content significantly increased independent of nitrate depletion. Studies on light quality showed that red light treatment did not change the biomass concentration, but stimulated lipid yield especially oleic acid, the most desirable bi
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Murray, Maureen B. "Effects of elevated atmospheric carbon dioxide and nutrients on the growth, phenology and physiology of Sitka spruce [Picea sitchensis (Bong.) Carr.]." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/11206.

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The aim of this thesis was to investigate the effects of elevated [CO<SUB>2</SUB>] and varying nutrient supply rates on the growth, phenology and physiology of Sitka spruce (<I>Picea sitchensis </I>(Bong.) Carr.).Two approaches were taken both using open top chamber facilities to fumigate seedling with either ambient (355 <I>μ</I>mol mol<SUP>-1</SUP> Co<SUB>2</SUB>) or elevated (700 <I>μ</I>mol mol<SUP>-1</SUP> CO<SUB>2</SUB>). Firstly, a long term study on the direct impact of elevated [CO<SUB>2</SUB>] was undertaken, this experiment ran for three consecutive years. Comparisons between respon
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Silva, Jéssica Caroline dos Santos. "Estoques e fluxos de carbono e nitrogênio acima e abaixo do solo em fragmentos de Floresta Atlântica no sul do Brasil." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-30112017-101614/.

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Florestas tropicais tem um papel relevante nos ciclos globais do carbono e nitrogênio. A Floresta Atlântica é um bioma tropical ameaçado da América do Sul, de imensa complexidade estrutural, mas ainda pouco investigado quanto ao seu funcionamento. Neste contexto, o objetivo principal desse estudo foi investigar a estrutura da floresta através da quantificação da biomassa viva acima do solo e da queda anual de folhas. Paralelamente, as concentrações de carbono e nitrogênio foram determinadas no solo, e na vegetação, permitindo a determinação de estoques e fluxos desses elementos em áreas de dif
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41

Sadurski, Stephen Edward. "The Biogeochemistry of Carbon Isotopes in Local Lakes." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1357745315.

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Andersson, Eva. "Benthic-Pelagic Microbial Interactions and Carbon Cycling in Clearwater Lakes." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5798.

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Vaughan, Matthew CH. "Shining light on the storm: Using high-frequency optical water quality sensors to characterize and interpret storm nutrient and carbon dynamics among contrasting land uses." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1002.

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Elevated nutrient concentrations present significant challenges to surface water quality management globally, and dissolved organic matter mediates several key biogeochemical processes. Storm events often dominate riverine loads of nitrate, phosphorus, and dissolved organic matter, and are expected to increase in frequency and intensity in many regions due to climate change. The recent development of in situ optical sensors has revolutionized water quality monitoring and has highlighted the important role storms play in water quality. This dissertation focuses on improving the application of i
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Olsson, Per. "Effects of fertilisation on rhizospheric and heterotrophic soil CO2 efflux in boreal Norway spruce stands /." Umeå : Dept. of Forest Ecology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/10064860.pdf.

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Abell, Jeffrey Thomas. "Giving a damn about DOM in the subtropical North Pacific : quantifying the role of dissolved organic matter in the cycling of carbon, oxygen and nutrients in the upper ocean /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/11060.

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Towler, Melissa J. "Effects of inoculum density, carbon concentration, and feeding scheme on the growth of transformed roots of Artemisia annua in a modified nutrient mist bioreactor." Digital WPI, 2005. https://digitalcommons.wpi.edu/etd-dissertations/269.

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Previous work has shown that despite the lack of oxygen limitation, transformed roots of Artemisia annua had lower biomass productivity in a nutrient mist bioreactor than in a liquid-phase bubble column reactor where the roots demonstrated metabolic signs of oxygen stress. Mathematical modeling suggested that the roots were too sparsely packed to capture mist particles efficiently and to achieve high growth rates. In this study, higher packing fractions were tested, and the growth rate increased significantly. Similarly, higher sucrose concentrations increased the growth rate. Growth kinet
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Hicks, Lettice Cricket. "Controls on carbon cycling in tropical soils from the Amazon to the Andes : the influence of climate, plant inputs, nutrients and soil organisms." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23477.

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Tropical soils are a globally important store of terrestrial carbon (C) and source of atmospheric carbon dioxide (CO2), regulated by the activity of soil microorganisms, through the mineralisation of plant residues and soil organic matter (SOM). Climatic warming will influence microbial activity, and this may accelerate the rate of C release from soils as CO2, contributing to alterations in current atmospheric composition, and generating feedbacks to climate change. Yet the magnitude of C loss from tropical soils remains uncertain, partly because we do not fully understand how non-climatic fac
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Fiorin, Jackson Ernani. "Ciclagem de nutrientes e produtividade de grãos em sucessões de culturas sob sistema plantio direto." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/3310.

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The no-tillage adoption combined with the presence of crop residues on soil surface and minimum soil disturbance increase the soil organic matter content, that associated with broadcast fertilization, change the nutrient dynamic and its relationship with plant nutrition. This study was carried out in a long term experiment (1997 to 2007) in Cruz Alta (RS) aim to select cropping systems efficient in nutrient cycling of N,P and K and maintain crop yield under no-tillage. The experimental design was randomized blocks with four replications. The cropping systems were composed by cover crops and ca
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Puig, Broch Sebastià. "Operation and control of SBR processes for enhanced biological nutrient removal from wastewater." Doctoral thesis, Universitat de Girona, 2008. http://hdl.handle.net/10803/7798.

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In the last decades, the awareness of environmental issues has increased in society considerably. There is an increasing need to improve the effluent quality of domestic wastewater treatment processes. This thesis describes the application of the Sequencing Batch Reactor (SBR) technology for Biological Nutrient Removal (BNR) from the wastewater. In particular, the work presented evolves from the nitrogen removal to the biological nutrient removal (i.e. nitrogen plus phosphorous removal) with special attention to the operational strategy design, the identification of possible reactor cycle cont
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Pimentel, Tania Pena. "Dinâmica do carbono em uma microbacia no extremo leste da Amazônia." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-01082016-175320/.

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O presente estudo objetiva avaliar os mecanismos de transferência de carbono entre os compartimentos atmosfera, vegetação, solo e igarapé em uma microbacia da Amazônia Ocidental. Dois igarapés drenandos, respectivamente, 2927 e 66,73 ha de floresta de terra firme, foram monitorados durante um ano. A área de estudo se encontra na zona de amortecimento de uma Unidade de Conservação de Uso Sustentável denominada Floresta Estadual do Amapá (FLOTA/AP), na região central do estado de mesmo nome. Foram coletadas as águas da chuva, da precipitação interna da floresta, do escoamento de água pelo tronco
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