Search for dissertations about: "nutrients"

Showing result 1 - 5 of 546 swedish dissertations containing the word nutrients.

  1. 1. Long-term development, modeling and management of nutrient loading to inland and coastal waters

    University dissertation from Stockholm : Institutionen för naturgeografi och kvartärgeologi

    Author : Amélie Darracq; Stockholms universitet.; Stockholms universitet.; [2007]
    Keywords : Physical Geography; geografi med naturgeografisk inriktning; Nutrients; catchments; environmental management; climate change; population and lifestyle development; subsurface-surface water interactions; long-term simulations; nutrient retention; modeling; hydrology; transport processes; biogeochemistry; scaling; transport and reaction rates; nutrients; climate chage;

    Abstract : Environmental and water system protection and restoration require accurate knowledge and quantification of waterborne pollutant transport, retention-release and transformation processes taking place in the subsurface, river, lake and sea water systems, and at the interfaces between these systems. This thesis investigates the importance of spatial model resolution for such quantification and the possible long-term nutrient load development under different human perturbations and nutrient source management scenarios in the Swedish Norrström drainage basin, based on simulations with the GIS-based dynamic nutrient transport-attenuation model POLFLOW. READ MORE

  2. 2. Productivity and carbon transfer in pelagic food webs in response to carbon, nutrients and light

    University dissertation from Umeå : Institutionen för ekologi, miljö och geovetenskap, Umeå universitet

    Author : Carolyn Faithfull; Umeå universitet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; bacterial production; phytoplankton production; mesocosms; food webs; carbon; nutrients; light; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi; limnologi; Limnology;

    Abstract : 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. READ MORE

  3. 3. Urban wastewater systems: From disposal to reuse. A study of different systems with focus on water and nutrients flows

    University dissertation from Department of Water Resources Engineering, Lund Institute of Technology, Lund University

    Author : Justyna Czemiel Berndtsson; [2004]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Storm Water; Urban; Wastewater; Civil engineering; offshore technology; hydraulic engineering; Väg- och vattenbyggnadsteknik; soil mechanics; pollution control; Environmental technology; Miljöteknik; kontroll av utsläpp; Nutrients;

    Abstract : Urban wastewater systems are currently exposed to a major rethink dictated by new demands on resource management. It is postulated that next to providing efficient sanitation (preventing spread of pathogenic microorganisms) these systems should support resource reuse. READ MORE

  4. 4. Extraction of logging residues for bioenergy effects of operational methods on fuel quality and biomass losses in the forest

    University dissertation from Växjö : Linnaeus University Press

    Author : Bengt Nilsson; Linnéuniversitetet.; [2016]
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Forest fuel; Storage; Fraction composition; Needles; Defoliation; Moisture content; Nutrients; Nitrogen; Norway spruce; Picea abies; Skogsbränsle; Lagring; Fraktionsfördelning; Barr; Avbarrning; Fukthalt; Näringsämnen; Kväve; Gran; Picea abies; Forestry and Wood Technology; Skog och träteknik;

    Abstract : Wood products play a key role in the transformation to a more sustainable society based on renewable bio-based resources, together with the positive effects on climate mitigation by replacing fossil fuels. However, to increase the use of forest fuel in practice it is important to understand the effects of handling and storage on its quality and removal of nutrients from the forest. READ MORE

  5. 5. The Role of Picophytoplankton in Lake Food Webs

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Stina Drakare; Uppsala universitet.; [2002]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; picophytoplankton; competition; heterotrophic bacteria; nutrients; humic DOC; Biologi; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi; limnologi; Limnology;

    Abstract : Picophytoplankton were inferior competitors for inorganic phosphorus compared to heterotrophic bacteria. This may be due to the source of energy available for the heterotrophs, while cell-size was of minor importance. However, picophytoplankton were superior to large phytoplankton in the competition for nutrients at low concentrations. READ MORE