Sökning: "biogeochemistry"

Visar resultat 16 - 20 av 51 avhandlingar innehållade ordet biogeochemistry.

1. 16. Organic geochemical investigation of sources, transport and fate of terrestrial organic matter in the southeast Laptev Sea

   Författare :Emma Karlsson; Örjan Gustafsson; Volker Brüchert; Sebastian Sobek; Rienk Smittenberg; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; biogeokemi; Marine Geoscience; marin geovetenskap; Applied Environmental Science; tillämpad miljövetenskap;

   Sammanfattning : Permafrost carbon stores have been suggested to react to warming trends with increased terrestrial loading to its coastal waters. Presently, the warming has been seen to be especially high in the East Siberian Arctic and the fate of the major release of terrestrial matter to these coasts is yet to be detailed. LÄS MER

3. 17. Marine nitrogen fixation : Cyanobacterial nitrogen fixation and the fate of new nitrogen in the Baltic Sea

   Författare :Isabell Klawonn; Helle Ploug; Lasse Riemann; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biogeochemistry; nitrogen cycling; nitrogen fixation; cyanobacteria; Baltic Sea; Marine Ecology; marin ekologi;

   Sammanfattning : Biogeochemical processes in the marine biosphere are important in global element cycling and greatly influence the gas composition of the Earth’s atmosphere. The nitrogen cycle is a key component of marine biogeochemical cycles. LÄS MER

4. 18. Modelling effects of climate change and forestry on weathering rates and base cation cycling in forest soils

   Författare :Veronika Kronnäs; BECC: Biodiversity and Ecosystem services in a Changing Climate; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; weathering; forest; biogeochemistry; Dynamic Modelling; ForSAFE;

   Sammanfattning : Base cations are important in forest soils as nutrients for vegetation and protection against soil acidification. Today, base cations have been lost from soils through acidification and forest harvesting. With low levels in soils, temporary situations of deficiency could occur. LÄS MER

5. 19. Fate of organic carbon in a tropical mangrove ecosystem

   Författare :John Machiwa; Michael Risk; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; biogeokemi;

   Sammanfattning : The aim of this thesis was to study the budget and fluxes of organic carbon in a tropical mangrove forest. Maruhubi forest is located in the Island of Zanzibar, East Africa. Aspects of structure and functions of the ecosystem are investigated. LÄS MER

7. 20. Geochemical modelling of acid mine drainage in mill tailings : Quantification of kinetic processes from laboratory to field scale

   Författare :Sally Ursula Salmon; KTH; []
   Nyckelord :geochemistry; biogeochemistry;

   Sammanfattning : Assessment of the potentially acidic, heavy metal-ladenleachates that leave deposits of sulfide ore mill tailings andevaluation of various possible options for mill tailingremediation are scientific problems of increasing practicalimportance. High costs may be associated with the mill tailingremediation, not least after recent changes in Swedish andEuropean environmental legislation. LÄS MER