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Dissertations / Theses on the topic 'Nutrients Retention'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Marshall, Michael C. "Hyporheic transformation and retention of salmon-derived nutrients in southeast Alaska streams." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1225123041&sid=7&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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2

Koskiaho, J. (Jari). "Retention performance and hydraulic design of constructed wetlands treating runoff waters from arable land." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514281586.

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Abstract Agriculture is the main source of nitrogen (N) and phosphorus (P), which are the nutrients accelerating the eutrophication of waters in Finland. Hence, mitigation measures are needed to reduce the nutrient loading from the arable land. Since Finland's accession to the EU in 1995 and the subsequent adaptation to its agri-environmental policy, constructed wetlands (CWs) have been one of the mitigation measures for which farmers may receive agri-environmental subsidies. The aim of this study was to find out how efficiently such CWs are able to retain the loading and how they should be de

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3

Hagman, Christina. "Varmhållen och kyld skolmat : En jämförelse med fokus på energianvändning mot bakgrund av livsmedelssäkerhet och näringsretention." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-68445.

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The aim of this report has been to investigate the use of electricity energy before and after a conversion of foodservice. The ambition was also to highlight the food safety and the retention of nutrients in relation to the conversion. The methods being used were qualitative interviews, case studies, study visits and literature. The equipment and the use of energy was the same in 2008 as in 2011 for hot-holding of the tested component, sauce with ham. The chilled system used more than three times the energy and cost for one portion than one portion in the hot-hold system. The food safety is al

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4

Isenberg, William. "Sources and Fates of Nutrients in the Tidal, Freshwater James River." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2686.

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Tidal freshwater reaches of estuaries may play an important role in mitigating nutrient fluxes from watersheds to the coastal zone due to their location at the interface between riverine and estuarine systems. We developed annual N and P budgets for the tidal, freshwater James River over 4 calendar years (2007-2010) taking into account riverine inputs at the Fall Line, local points sources (including CSO events), ungagued inputs, riverine outputs, and tidal exchange. The tidal freshwater James River experiences high areal loading rates of TN (383 mg/m2/d) and TP (70 mg/m2/d) due to the combi

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5

au, j. anderson@murdoch edu, and Jonathan Anderson. "Impacts of Amending Bauxite Residue Sands with Residue Fines for the Establishment of Vegetation on Residue Disposal Areas." Murdoch University, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090831.155453.

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Long term storage of bauxite residue materials requires a capping stratum which will limit erosion while stabilizing slopes, limit deep infiltration of water into storage piles, and be aesthetically acceptable to the surrounding community. A diverse native vegetative community capable of surviving seasonal drought, low plant available water and nutrient constraints has the best potential of satisfying most, if not all of these requirements. Current and past rehabilitation of residue disposal areas (RDAs) using species native to southwest Western Australia has exhibited varying success. Current

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Englund, Sofia. "Optimizing the design of two-stage ditches to improve nutrient and sediment retention." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415420.

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Negative effects on water quality are created by eutrophication of the world’s water resources. Mitigation measures have been implemented, but poor improvements in water quality have been observed. Two-stage ditches have the possibility to increase nutrient and sediment retention to reduce eutrophication in receiving water bodies. A two-stage ditch has floodplain terraces on each side of the ordinary main channel. The terraces are available for flooding during high water flows and enables decreases in flow velocities. However, more knowledge is needed about the two-stage ditch and its effect i

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7

Paull, Rachel May. "Evaluating the Role of Biotic and Abiotic Ecosystem Components on the Retention and Removal of Ditch Nutrients in Ditches of Different Construction." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1594220539737151.

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8

Henderson, Elizabeth. "A KINETICS STUDY OF SELECTED FILTRATION MEDIA FOR NUTRIENT REMOVAL AT VARIOUS TEMPERATURES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2344.

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In recent years the nutrient levels of the Upper Floridan aquifer have been increasing (USGS, 2008). An example of this is found in Ocala, Florida where Silver Springs nitrate concentrations have risen from 0.5 mg/L in the 1960 s to approximately 1.0 mg/L in 2003 (Phelps, 2004). Because stormwater is a contributor to surficial and groundwater aquifer recharge, there is an increasing need for methods that decrease nitrogen and phosphorus levels. A laboratory column study was conducted to simulate a retention pond with saturated soil conditions. The objectives of the column studies reported in t

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9

Debruler, Daniel Gary. "Soil Carbon, Nutrients, and Phosphorus Fractions: Responses to Weed Control and Harvest Residual Retention in two 10-Year-Old Douglas-fir (Pseudotsuga menziesii) Stands of the Pacific Northwest." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50486.

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Intensive forest management techniques such as whole-tree harvesting and use of herbicides to control weeds can have an effect on nutrient cycling and nutrient pool sizes in the mineral soil. This study was conducted to measure differences in soil carbon (C), nutrient pools, or phosphorus (P) fractions associated with harvest-intensity (bole-only vs. whole-tree harvest) and weed-control treatments (initial weed control vs. five years of annual weed control) after ten years. Soil C, nitrogen (N), and P, and exchangeable calcium (Ca), potassium (K), magnesium (Mg), and Hedley P fractions were m

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10

Karjalainen, S. M. (Satu Maaria). "Identification of processes leading to long-term wastewater purification in northern treatment wetlands." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212777.

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Abstract Treatment wetlands (TW) constructed on natural wetlands potentially perform efficient purification of wastewater, but the longevity of TWs at northern latitudes is not well known. This thesis examined processes affecting nutrient and suspended solids (SS) retention in TWs during their lifetime. In total, 15 TWs were studied using water and peat quality and gas flux data for different TW life lengths, the longest period being 18 years. The TWs commonly retained nutrients and suspended solids efficiently, even after 18 years of wastewater loading. For nitrogen (N) removal, sedimentation

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11

Fantin-Cruz, Ibraim. "Efeitos da formação e operação de um reservatório de pequena regularização na alteração da qualidade da água e do regime hidrológico na planície de inundação do Pantanal." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/62108.

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Sabe-se que a formação de reservatórios altera a qualidade e a quantidade da água de montante e jusante e que a direção e a magnitude das alterações dependem de suas características construtivas, operacionais, morfométricas, bem como do regime hidrológico e climático da região. Porém, a maior parte deste conhecimento foi fundamentada em pesquisas de reservatórios com grande capacidade de regularização, que fazem parte da realidade do Pantanal, uma região que vem sendo impactada por um número cada vez maior de reservatórios com pequena capacidade de regularização, levantando questionamentos sob

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12

Natho, Stephanie. "Modelling nutrient retention in floodplains." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2013. http://dx.doi.org/10.18452/16854.

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Obwohl es sehr detaillierte Studien zur Nährstoffretention in einzelnen Auen und Feuchtgebieten gibt, ist die Bedeutung von Auen für die Nährstoffbilanz auf Landschaftsebene wenig untersucht. Dies liegt an dem geringen Wissensstand über die wichtigsten Parameter der Nährstoffretention, nämlich die überflutete Auenfläche sowie die in die Aue strömende Nährstofffracht. Zusätzlich gibt es bislang keinen Ansatz, demzufolge beide Parameter abhängig vom Abfluss, und damit variabel für verschiedene zeitliche Einheiten, berechnet werden können. Aus diesem Grund analysiert diese Arbeit die Überflutung

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13

Zweynert, Ulrike. "Möglichkeiten und Grenzen bei der Modellierung von Nährstoffeinträgen auf Flussgebietsebene." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1239967648045-37533.

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Modelle werden eingesetzt, um Menge und Herkunft der Stoffeinträge auf Flussgebietsebene zu analysieren. Aus den Ergebnissen der Modellierung lassen sich Handlungsempfehlungen zur Verbesserung der Gewässergüte ableiten. Für die Interpretation der Modellergebnisse sind Kenntnisse über die Genauigkeit und Aussagekraft der Ergebnisse notwendig. Das Modell MONERIS als konzeptionelles Modell für die Anwendung auf Flussgebietsebene wurde innerhalb der vorliegenden Arbeit in 5 europäischen Flusseinzugsgebieten angewandt. Sowohl mit verschiedenen Ansätzen aufbereitete Abflusswerte als auch unterschied

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14

GONCALVES, FLAVIA DE MIRANDA. "BIOCHAR CHARACTERIZATION AND THEIR NUTRIENT RETENTION CAPACITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29720@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO<br>O carvão vegetal é um dos produtos gerados a partir da decomposição térmica, comumente denominada pirólise, de uma determinada biomassa em ausência total ou quase total de um agente oxidante, como o oxigênio do ar. Estudos baseados na Terra Preta de Índio indicam que o carvão pode contribuir diretamente com a melhoria da qualidade do solo, e com isso, permite a recuperação de solos degradados, além da contribuição no cr

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15

Eger, Caitlin Genet. "Nutrient Retention in Roadside Retrofit Rain Gardens." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343837490.

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16

MESQUITA, CARLOS H. de. "Modelo para determinacao da absorcao de substancias radioativas .Aplicacao em radiodosimetria e nutricao." reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10267.

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Made available in DSpace on 2014-10-09T12:36:43Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:08Z (GMT). No. of bitstreams: 1 04227.pdf: 2788884 bytes, checksum: 6ec206a76d3d65dff926c39d252535e5 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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17

Zweynert, Ulrike. "Möglichkeiten und Grenzen bei der Modellierung von Nährstoffeinträgen auf Flussgebietsebene: Untersuchungen am Beispiel des Modells MONERIS." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A23599.

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Modelle werden eingesetzt, um Menge und Herkunft der Stoffeinträge auf Flussgebietsebene zu analysieren. Aus den Ergebnissen der Modellierung lassen sich Handlungsempfehlungen zur Verbesserung der Gewässergüte ableiten. Für die Interpretation der Modellergebnisse sind Kenntnisse über die Genauigkeit und Aussagekraft der Ergebnisse notwendig. Das Modell MONERIS als konzeptionelles Modell für die Anwendung auf Flussgebietsebene wurde innerhalb der vorliegenden Arbeit in 5 europäischen Flusseinzugsgebieten angewandt. Sowohl mit verschiedenen Ansätzen aufbereitete Abflusswerte als auch unterschied

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18

Rude, Christopher Mark. "Effects of feed manufacturing on nutrient metabolism, nutrient retention, and growth performance of broiler chickens." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/17152.

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Doctor of Philosophy<br>Department of Animal Sciences and Industry<br>R. Scott Beyer<br>Broiler chicken feed is processed. Cereal grains are ground to reduce particle size and the feed usually is pelleted. When pelleted, broiler diets are steam conditioned and forced through a die causing varying levels of starch gelatinization. Cereal grain particle size and starch gelatinization can be controlled during feed manufacturing. Earlier research has shown that starch gelatinization negatively affects growth performance of 0 to 21 d of age. An experiment was conducted to determine the effects

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19

Lannergård, Emma. "Drained land and nutrient transport in the river Svärtaå catchment." Thesis, Linköpings universitet, Institutionen för tema, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69685.

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Land use changes such as lowering of lakes, draining of wetlands and channelizing of streams have affected the hydrological environment in many catchment areas. Numerous studies report that these changes affect the nutrient retention. The river Svärtaå catchment, near Nyköping is identified as one of the areas in Sweden that transport most phosphorus and nitrogen to the Baltic Sea per unit area. The aim of this study was therefore to analyse to which extent land use changes such as lowering of lakes, draining of wetlands and channelizing of streams have affected the nutrient transport to the B

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20

Wang, Chih-Yu. "Floating wetlands for urban stormwater treatment." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/52036.

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A floating treatment wetland (FTW) is an ecological approach which seeks to reduce point and nonpoint source pollution by installing substrate rooted plants grown on floating mats in open waters. While relatively novel, FTW use is increasing. A review of literature identified several research gaps, including: (1) assessments of the treatment performance of FTWs; (2) evaluations of FTWs in the U.S., particularly within wet ponds that receive urban runoff; and (3) plant temporal nutrient distribution, plant growth rate, and the long-term persistence of the FTWs in temperate regions with periodic

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21

Edwards, Richard Reginald. "The potential for the use of willow (Salix spp.) in buffer zones for reducing nitrate and atrazine pollution." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322361.

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22

Pinney, Jenae Elizabeth. "Influence of light and algae on nutrient transformations at the sediment-water interface of an agricultural stream." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76801.

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The sediment-water interface is an active biogeochemical zone within streams, where solutes come in contact with mineral surfaces, biota, and reducing conditions. Here, we sought to examine the influence of light, the sediment water interface, and algae on dissolved organic carbon (DOC), nitrogen, and phosphorus within Maple Creek, an agriculturally impacted stream located in Fremont, Nebraska. Simultaneous continuous injection experiments into replicate open- and closed-bottom chambers were used to control the hydrologic residence time. A bromide tracer was injected, and samples were taken fo

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Friesen, Anthony M. "Multi-method approach to quantifying nutrient retention in a wastewater irrigated watershed." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63136.

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As water is becoming more scarce, the application of wastewater onto land is becoming increasingly common. It is of particular interest in places where the otherwise receiving water body is considered too sensitive to handle the increased load of nutrients, and other wastewater constituents. This study utilized three methods to determine the extent to which phosphorus and nitrogen are being retained within a wastewater irrigated watershed in southern B.C., Canada. The methods include; Mass Balance, an End Member Mixing Analysis (EMMA) to determine real time and seasonal retention, and a soil a

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Laruelle, Goulven Gildas. "Quantifying nutrient cycling and retention in coastal waters at the global scale." Doctoral thesis, Utrecht University, Utrecht, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/282551.

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Kennison, Rachel Lee. "Evaluating ecosystem function of nutrient retention and recycling in excessively eutrophic estuaries." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1693061441&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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26

Lucas, William C. "Interactions of Hydraulics and Biogeochemistry Involved in Nutrient Retention by Bioretention Mesocosms." Thesis, Griffith University, 2013. http://hdl.handle.net/10072/366575.

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Excess nutrient loads conveyed in stormwater runoff are largely responsible for eutrophication of receiving waters. Bioretention systems are a stormwater treatment device designed to reduce nutrient loads. Whilst bioretention systems are very effective in filtering particulate nutrients in runoff, they are less effective for long term retention of dissolved nutrients. Since dissolved phosphorus (P) and nitrogen (N) often comprise a substantial fraction of the runoff nutrient loads, this results in lower overall nutrient retention. This research investigated the effectiveness of N and P removal

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Saunders, Darla L. "Nitrogen retention in freshwater ecosystems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq64444.pdf.

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28

Yao, Lu. "Controls over carbon and nutrient dynamics in wetland soils: an ecological stoichiometry perspective." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/392026.

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Wetland ecosystems can store large amount of carbon (C) and serve as a biogeochemical ‘hotspot’ for nutrient retention. According to Ramsar Convention, wetlands are defined as areas permanent or temporary with fresh, brackish or saltwater, including areas of marine water the depth of which at low tide does not exceed 6 metres. The C and nutrient dynamics in soil depends on an array of biotic and abiotic factors as well as their interactions. Soil microbial demand of C and nutrients is regulated by the elemental stoichiometry of microbial biomass and resource availability in the environment. Gl

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Lopes, Anabela Ferreira. "Efeito de diferentes métodos de confeção no valor nutricional da carne de bovino : estudo experimental nas carnes Barrosã e Mertolenga." Doctoral thesis, Universidade de Lisboa. Faculdade de Medicina Veterinária, 2015. http://hdl.handle.net/10400.5/11445.

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Tese de Doutoramento em Ciências Veterinárias, especialidade de Segurança Alimentar<br>Nos tempos que correm estamos cada vez menos disponíveis para a preparação de uma refeição, não existindo, na maioria das vezes, a preocupação de como a processamos e as alterações ocorridas em termos de composição nutricional. Tal como é sabido desde há longa data, a carência de determinados nutrientes pode conduzir a graves problemas de saúde, sendo deste modo imprescíndivel o conhecimento dos fatores que contribuem para minimizar a perda de nutrientes dos alimentos. Considerando que a maioria dos alimento

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Spieles, Douglas J. "Nutrient retention and macroinvertebrate community structure in constructed wetlands receiving wastewater and river water /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487952208105913.

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Goldschmidt, Alicia M. "Biochar Amendment of Green Roof Substrate: Effect on Vegetation, Nutrient Retention, and Hydrologic Performance." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535372571339002.

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Wood, Joseph. "SEASONAL PATTERNS OF NUTRIENT RETENTION IN A RESTORED TIDAL FRESHWATER STREAM OF THE MID-ATLANTIC COASTAL PLAIN." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2085.

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Nutrient retention is governed by the interplay between physical processes that control the throughput of water and materials (i.e., water residence time), and by biological processes that govern transformation and uptake (e.g., microbial denitrification). A partial breach of the dam located on Kimages Creek (VA) re-established the historical (pre-1920) connection to the James River and provided a well-defined channel to gauge tidal exchange. We quantified tidal exchange as well as non-tidal (watershed) inputs on a monthly basis to assess Nitrogen (N) retention. Water and N fluxes were domi

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Ogunniyi, Jumoke Esther. "Effects of clay and organic matter amendments on water and nutrient retention of sandy soils." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/101514/.

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Sandy soils are one of the most widely distributed soils in the world. However, crop production on these soils can be problematic especially in terms of water and nutrient retention. In the face of climate change and a projected reduction in water availability, food production is likely to be particularly affected. The aim of this research is to examine if amending soils with clay and organic matter can improve their water and nutrient retention. The research approach employed laboratory column leaching experiments, rainfall simulation, Computed Tomography (CT) scanning and field trials to inv

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González, Sanchis María del Carmen. "Flooding dynamics and nutrient retention in the middle Ebro floodplain: experimental assessment and numerical modeling." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/15242.

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El presente trabajo destaca la simulación numérica como herramienta capaz de reproducir y predecir los principales procesos que producen y mantienen los ecosistemas de llanuras de inundación. Para ello, la dinámica del flujo, la actividad geomorfológica, la sedimentación y la captura de nutrientes de la llanura de inundación, son evaluadas experimentalmente. Seguidamente, los datos experimentales son incluidos en un modelo numérico para desarrollar una herramienta completa de simulación capaz de predecir la dinámica del flujo, la actividad geomorfológica, la sedimentación, el aporte de nutrien

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Dong, Yu. "Application of integrated constructed wetlands for contaminant treatment and diffusion." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7750.

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The sediment accumulation is an important characteristic in the ageing process of integrated constructed wetlands (ICW). Retained nutrient and other contaminants in wetland sediments have the potential to be remobilized and released to the overlying water column when environmental conditions change. In this study, mesocosms which filled with saturated sediments and planted with Phragmites australis and Agrostis stolonifera were set up to examine nutrient and other contaminants retention and/or release by wetland sediment and substrates. The effects of physico-chemical parameters on sediment-wa

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Maxfield, Tom. "The short-term stability and function of charcoal in soil and its relevance to Ghanaian subsistence agriculture." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25419.

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Maintaining an adequate level of soil organic matter and nutrients cycling is crucial to the success of any soil management in the humid tropics. Cover crops, compost, or manure additions have been used successfully to supply nutrients to crops but the benefits of such amendments are often short-lived in the tropics, since decomposition rates are high. This study focused on charcoal which, when utilised as a soil amendment is termed ‘biochar’. Throughout this thesis, the terms ‘charcoal’ and ‘biochar’ are used interchangeably depending on the context. Charcoal exhibits physiochemical propertie

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Brown, Patrick Anderson. "Influence of anaerobic and anoxic hydraulic retention time on biological nutrient removal in a membrane bioreactor." [Ames, Iowa : Iowa State University], 2007.

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Clark, Jonathan H. "Effect of dry matter intake restriction on energy balance, ruminal fermentation, and nutrient retention by beef steers." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4243.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (December 12, 2005) Includes bibliographical references.

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Gillespie, William E. "Optimization of a retention pond design for nutrient trapping and peak flow reduction within an agricultural basin /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1203570501&sid=25&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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40

Yan, Xingcheng. "Greenhouse gas emissions and nutrient retentions in reservoirs of the Seine Basin : budget and modelling." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS152.

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L'impact des barrages–réservoirs sur les émissions de GES (gaz à effet de serre, CH4: méthane, CO2: dioxyde de carbone, et N2O: protoxyde d’azote) et sur les cycles biogéochimiques du C (carbone) et des nutriments (N: azote, P: phosphore, et Si: silice) a fait l'objet d'une attention croissante depuis plusieurs années. Après un premier travail d'estimation des émissions de GES par les réservoirs mondiaux, et l’examen de leur évolution à long terme, les travaux se concentrent sur les trois principaux réservoirs du bassin de la Seine, afin de déterminer leur contribution aux émissions de GES et

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Daradick, Shannon Pearl. "Soil microbial enzyme activity and nutrient availability in response to green tree retention harvesting in Coastal British Columbia." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31430.

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Green Tree Retention (GTR) was evaluated for its potential to retain soil microbial activity and nutrient availability after harvesting in the Coastal Western Hemlock biogeoclimatic zone of B.C., Canada. Soil samples were collected from four sizes (5, 10, 20, and 40 m diameter) of GTR patch at the centre, edge, and along a northerly transect to 30 m beyond the groups of live trees prior to and a few months after harvest. PRS™ Probes were used to determine the availability of nutrients; total nitrogen, nitrate (NO₃ ̄), ammonium (NH₄⁺) and phosphate (PO₄³ ̄), encountered by plant roots

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Kiser, Larry Christopher. "Nutrient Retention and Cycling in Southeastern U.S. Loblolly Pine (Pinus taeda L.) and Sweetgum (Liquidambar styraciflua L.) Plantations." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28989.

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Forest plantations in the southeastern U.S. are fertilized to increase growth on infertile, sandy soils. Nitrogen (N) and phosphorus (P) are the most common growth limiting nutrients. A key question that arises following fertilization of these soils is whether the applied fertilizer benefits only the current trees in the stand or also improves long-term site quality. The objectives of this study were to compare accumulation of N and P in the forest floor and mineral soil among unfertilized and fertilized plantations, determine soluble and residual N and P fractions and soluble carbohydrate and

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GercÌ§eker, Murat. "Effect of low solids retention time on macro-nutrient removal and microbial diversity in a jet-loop membrane bioreactor." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402158.

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Spangler, Jonathan Travis. "An Assessment of Floating Treatment Wetlands for Reducing Nutrient Loads from Agricultural Runoff in Coastal Virginia." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86656.

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Floating treatment wetlands (FTWs) are an innovative best management practice that can enhance the performance of traditional retention ponds by increasing removal of the nutrients nitrogen (N) and phosphorous (P). FTWs consist of floating rafts on which wetland plants are planted, allowing the roots to be submerged below the water surface while the shoots remain above. A growing body of research has documented FTW performance with regard to urban runoff treatment, however evaluation of FTW effectiveness for treatment of agricultural runoff has received less attention. Due to high fertilizatio

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Natho, Stephanie [Verfasser], Gunnar [Akademischer Betreuer] Nützmann, Mathias [Akademischer Betreuer] Zessner, and Dagmar [Akademischer Betreuer] Haase. "Modelling nutrient retention in floodplains : development of a concept to empirically derive the average inundated floodplain extent and incoming nutrient loads / Stephanie Natho. Gutachter: Gunnar Nützmann ; Mathias Zessner ; Dagmar Haase." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2013. http://d-nb.info/1044956267/34.

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Eriksson, Elin. "Initial nutrient retention capacity in a constructed wetland : Evaluating the effectiveness of a newly constructed wetland to reduce eutrophication symptoms in a Baltic Sea bay in northern Sweden." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184268.

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Since the turn of the last century, a substantial increase in nutrient load to the Baltic Sea is apparent. Adding the ongoing environmental change with raising temperatures and increased precipitation, this will continue to have a prominent environmental impact on our coastal ecosystems, especially in northern latitudes. Constructed wetlands are becoming more important as a mitigation measure to retain nutrients, however, they are until this day not well studied in northern latitudes. In this paper, nutrient retention in a newly constructed wetland is studied during its first month after activ

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White, Jay Steven. "Adaptive management and nutrient retention in a northern prairie wetland restored with agro-industrial and municipal wastewater at Frank Lake, Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq22690.pdf.

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Sun, Xiaolun. "Effect of Corn Quality and Enzyme Supplementation on Broiler Performance, Gastrointestinal Enzyme Activity, Nutrient Retention, Intestinal Mucin, and Jejunal Gene Expression." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29897.

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Three 2Ã 2 factorial experiments (EXP) were conducted to investigate the underlying mechanism of corn quality and a supplemented cocktail enzyme of amylase, protease, and xylanase on broiler performance from 0 to 49 days of age. In each of the first two EXP, the four diets used consisted of (1) diet AR-/BR-; reduced dietary energy by increasing corn A matrix metabolizable energy (ME) 138 kcal/kg in EXP 1 or 125 kcal/kg ME with corn B in EXP 2; (2) diet AR+/BR+; AR-/BR- plus Avizyme 1502Â® (AZ); (3) diet AN-/BN-; normal energy diet; (4) diet AN+/BN+; AN-/BN- plus AZ. In EXP 3, four dietary trea

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Nayeb, Yazdi Mohammad. "Understanding the role of scale in assessing sediment and nutrient loads from Coastal Plain watersheds delivered to the Chesapeake Bay." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99377.

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Urban and agricultural runoff is the principal contributor to non-point source (NPS) pollution and subsequent impairments of streams, rivers, lakes, and estuaries. Urban and agricultural runoff is a major source of sediment, nitrogen (N) and phosphorus (P) loading to receiving waters. Coastal waters in the southeastern U.S. are vulnerable to human impacts due to the proximity to urban an agricultural land uses, and hydrologic connection of the Coastal Plain to receiving waters. To mitigate the impacts of urban and agricultural runoff, a variety of stormwater control measures (SCMs) are impleme

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Kaspar, Kerrie L. "Pigmented potatoes on health : effect on oxidative stress, inflammatory damage and immune response in humans, sensory attributes, and nutrient retention during processing." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Dissertations/Spring2009/K_Kaspar_040809.pdf.

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