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Relevant bibliographies by topics / Nitrogen budgets

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Dissertations / Theses

Academic literature on the topic 'Nitrogen budgets'

Author: Grafiati

Published: 15 March 2023

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Dissertations / Theses on the topic "Nitrogen budgets"

1

Watson, Christine A. "Nitrogen budgets in pluricompartmental systems." Thesis, University of Aberdeen, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296512.

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Increasing concern over the adverse environmental impact of intensive agriculture has led to pressure to develop more sustainable, integrated farming systems which have the potential to minimise the loss of nitrogen to the environment whilst maintaining productivity. Alternative systems include pluricompartmental systems, which combine more than one enterprise or species in a formalised design, such as a crop rotation or spatial arrangement e.g. agroforestry. Three approaches to nitrogen budgeting were developed and their ability to quantitatively describe nitrogen cycling in pluricompartmenta

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2

Eriksson, Hägg Hanna. "Nitrogen land-sea fluxes in the Baltic Sea catchment : Empirical relationships and budgets." Doctoral thesis, Stockholms universitet, Institutionen för tillämpad miljövetenskap (ITM), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-32493.

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In this thesis empirical relationships and modeling tools are used to describe the relationship between human activities and meso- and large scale riverine N fluxes from land to sea. On a large scale Paper I showed that by only having knowledge about human population size and runoff one can estimate the riverine export of DIN (r2= 0.76). In Paper II we included two other important anthropogenic N inputs, i.e. atmospheric deposition and primary emission (PE) from animals. In most of the catchments the PE from animals were larger than the PE from humans. Hence, development of livestock is import

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3

Halpop, John W. "Nitrogen and Energy Budgets of Production Ewes on Summer Range in Southwestern Utah." DigitalCommons@USU, 1988. https://digitalcommons.usu.edu/etd/4086.

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Nitrogen (N) and energy budgets for free-roaming ewes were quantified on mountain summer range in southwestern Utah in 1986 and 1987. Diet quality (%N), in vitro organic matter digestibility (IVOMD), and energy were estimated with the use of five esophageally fistulated ewes. Excretion rates of N and energy to feces and urine were measured by total collection from five nonfistualted ewes. Total intake N(gN/(MBW*d-1) tracked intraseasonal changes of dietary N percent but was apparently buffered by fluctuations in dry matter intake. In each year, total urine N was closely related to dietary N co

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4

James, Andrew Gordon. "The feeding ecology of and carbon and nitrogen budgets for Engraulis capensis in the southern Benguela ecosystem." Doctoral thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/8409.

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Bibliography: leaves 179-231.<br>The two main schools of thought regarding the diets of intermediate microphagous clupeids are: A) that they are herbivorous and B) that they are omnivorous, but consume mainly zooplankton. The former view has been employed to explain their abundance in upwelling areas, since their purported ability to efficiently utilise the primary producers shortens the pelagic food chain to 1 or 2 links. The literature concerning the trophic ecology of some commercially important clupeids is reviewed and it is concluded that few are true phytophagists. Most are omnivorous an

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5

van, der Lingen Carl David. "The Feeding ecology of, and carbon and nitrogen budgets for, sardine sardinops sagax in the Southern Benguela upwelling ecosystem." Doctoral thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/17510.

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Bibliography : pages 178-202.<br>Combined laboratory and field studies were employed to examine the feeding ecology of sardine Sardinops sagax in order to evaluate conflicting hypotheses regarding the trophic position of clupeoids in upwelling ecosystems, and to compare the trophodynamics of sardine with those of the co-occurring anchovy Engraulis capensis. Carbon and nitrogen budget models constructed using data from these studies were used to quantify the effect of particular food environments upon sardine growth. Sardinops sagax is primarily a filter-feeder, with food particles <1230μm tota

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6

Randall, Benjamin. "Characterisation and quantification of the fluxes of particulate and dissolved nitrogen in the unicellular diazotroph crocosphaera watsonii : towards a closed nitrogen budget." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS685.

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Les flux importants de la phase N dissoute, qui renseignent sur les bilans globaux en N des diazotrophes individuels, sont mal compris. Cela est particulièrement vrai des diazotrophes récemment découverts, qui peuvent ne pas fonctionner selon des paradigmes préétablis. Crocosphaera watsonii est un de ces diazotrophes, que l'on trouve largement répandu dans les océans subtropicaux. Nous caractérisons ici les flux d'azote à la diazotrophie de Crocosphaera, y compris les flux de NO3-, NH4 + et de N organique dissous (DON). Nous visons également à utiliser nos résultats pour évaluer la précision d

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7

Bristow, Corben Emerson. "Experimental freshwater cage aquaculture: Short term effects on carbon, nitrogen and phosphorus budgets and the metabolism of a boreal shield lake." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27114.

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We conducted an experiment to determine the effects of cage aquaculture on the functional properties of a lake. We installed a commercial aquaculture operation into a lake located within a pristine headwater region of the boreal shield. We used a before-after control-impact design to evaluate the weight of evidence for causal effects. We quantified sinks, sources and exchanges of carbon, nitrogen and phosphorus to the lake and presented this information in a budget format. We then calculated retention rates for these chemicals and compared them to integral amounts of carbon, nitrogen and phosp

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8

Michori, Peter K. "Nitrogen budget under coffee." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333405.

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9

Lernbecher, Vincent. "Swedish Nitrogen Flows : A national budget of anthropogenically induced reactive nitrogen." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289176.

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Nitrogen is a fundamental element in all forms of life and a crucial component of our agricultural productivity and global food security. However, excess nitrogen caused by human activity poses a serious threat to the environment and human health. Understanding human influences on the nitrogen cycle are therefore essential for sustainable management of the nutrient. The flows of anthropogenically influenced and created reactive nitrogen in Sweden are examined in this study. Human-induced sources and mechanisms associated with nitrogen are quantified and illustrated in several charts constructe

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10

Batson, Jacqulyn A. "Denitrification and a Nitrogen Budget of Created Riparian Wetlands." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284968767.

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