Sökning: "Carbon uptake"

Visar resultat 11 - 15 av 202 avhandlingar innehållade orden Carbon uptake.

1. 11. Allochthonous and autochthonous carbon sources of lake bacterioplankton

   Författare :Emma Kritzberg; Enhet akvatisk ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Marinbiologi; limnologi; akvatisk ekologi; aquatic ecology; marine biology; Hydrobiology; bacterial community composition; bacterial growth efficiency; bacterioplankton; carbon subsidy; dissolved organic carbon; limnology;

   Sammanfattning : Organic substrates for pelagic bacteria are derived from dissolved organic carbon (DOC) in the water column that originates either from primary production from within the lake itself (autochthonous), or import of organic matter from the terrestrial watershed (allochthonous production). This thesis addresses the utilization of allochthonous versus autochthonous carbon (C) sources by lake bacterioplankton. LÄS MER

3. 12. Fluxes and transformation of carbon in the Siberian shelf seas under changing environment

   Författare :Irene Wåhlström; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbon system; Carbon dioxide; Arctic Ocean; Siberian shelf seas; Climate change;

   Sammanfattning : The Arctic is especially vulnerable to the increased air temperature caused by emissions of greenhouse gases to the atmosphere, carbon dioxide being one of them. In this thesis, both fieldwork and modelling of the East Siberian Arctic Shelf (the Laptev Sea and the East Siberian Sea) have been carried out to investigate the carbon system in this region. LÄS MER

4. 13. Uptake Processes of Polychlorinated Biphenyls at the Base of the Pelagic Food Web

   Författare :Anna Sobek; Örjan Gustafsson; Derek Muir; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PCBs; plankton; equilibrium partitioning; uptake; aquatic food web; Environmental chemistry; Miljökemi;

   Sammanfattning : Hydrophobic organic contaminants (HOCs) are persistent, toxic to biota and are known to bioaccumulate in food webs. In this thesis, polychlorinated biphenyls (PCBs) were used as model compounds to study the fate and transport of HOCs in the aquatic environment. LÄS MER

5. 14. Carbon stocks and fluxes in a young Siberian larch (Larix sibirica) plantation in Iceland

   Författare :Brynhildur Bjarnadottir; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; interannual variability; carbon balance; Larix sibirica; afforestation; stock-change method; carbon sequestration; eddy covariance; biomass functions;

   Sammanfattning : The understanding of how forests function with respect to carbon (C) balance and its interaction with the climate system is a fundamental question in climate change research. Another important question is how large the sink for CO2 is in northern forests and how it varies with forest type, management, stand age and with external factors, such as climate variability. LÄS MER

7. 15. Ecosystems in the Anthropocene: the role of cropland management for carbon and nitrogen cycle processes

   Författare :Stefan Olin; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbon; Nitrogen; DVM; Ecosystem modelling; Cropland; Management; Yields;

   Sammanfattning : Through deforestation and conversion of natural ecosystems to croplands and pastures, have humans released vast amounts of carbon (C) dioxide (CO2) into the atmosphere. Roughly one third of the cumulative anthropogenic emissions until today stem from these practices, the remainder being mostly due to fossil fuel combustion. LÄS MER