Biogeochemical processes and environmental change impacts in northern terrestrial and aquatic ecosystems

Our research activities focus on biogeochemical processes in terrestrial and aquatic ecosystems. Interactions between abiotic factors and biotic processes in boreal and arctic soils, waters and sediments are of particular interest. Terrestrial projects focus on the cycling of nutrients (carbon, nitrogen, phosphorus and sulphur) and contaminants (Hg, Pb and persistent organic pollutants) in soils. In the aquatic projects we study; 1) effects of allochthonous organic matter on production and respiration in lakes; 2) emission of carbon dioxide and methane from lakes and streams; 3) the influence of climate and nitrogen deposition on lake ecosystem function. An important part is to integrate research on terrestrial and aquatic ecosystems in order to understand the function of northern ecosystems and their response to environmental change. Research is carried out in cooperation with different Swedish and international universities and the Climate Impacts Research Centre (CIRC) in Abisko. The research includes comparative studies across climatic gradients in northern Sweden (boreal-alpine/arctic) as well as experimental studies in laboratory and field.

Research projects

Climate impact on the carbon emission and export from Siberian inland waters (SIWA)Greenhouse gas emission from aquatic systems in northern permafrost areasQuantifying cryogenic soil-mixing in the tundra soil and its role for the long-term carbon cycling in the arcticTracing the origin of dissolved organic carbon using stable sulphur isotopesThe aquatic conduit in taiga and tundra eco-regions- a sink or source for atmospheric carbonEffects of nitrogen deposition on nutrient limitation and phytoplankton productivity in lakes Above- and belowground interactions in tundraPhosphorus dynamics and speciation in tundra and taigaControl of lake productivity: effects of light, terrestrial organic matter and food web structureEffects of forestry on greenhouse gas emissions from boreal inland watersThe Contamination Ecology Think Tank research facility

Studies of linkages between bioavailability and dissolved organic carbon (DOC) quality in high-latitude streams

Selected publications

Karlsson J., T. R. Christensen, P. Crill, J. Förster, D. Hammarlund, M. Jackowicz-Korczynski, U. Kokfelt, C. Roehm, P. Rosen. 2010. Quantifying the relative importance of lake emissions in the carbon budget of a subarctic catchment. Journal of Geophysical Research-Biogeosciences, 115, G03006, doi:10.1029/2010JG001305

Berggren M., L. Ström, H. Laudon, J. Karlsson, A. Jonsson, R. Giesler, A.-K. Bergström, M. Jansson. 2010. Lake secondary production fueled by rapid transfer of low molecular weight organic carbon from terrestrial sources to aquatic consumers. Ecology letters, 13: 870-880

Karlsson J., P. Byström, J. Ask, P. Ask, L. Persson, M. Jansson. Light limitation of nutrient-poor lake ecosystems. Nature, 460:506-509

Klaminder J., K. Yoo, R. Giesler. 2009. Soil carbon accumulation in the dry tundra: the important role played by precipitation. Journal of Geophysical Research, G04005:doi:10.1029/2009JG000947

Ask J., J. Karlsson, P. Byström, P. Ask, L. Persson, M. Jansson. 2009. Whole lake estimates of carbon flux through algae and bacteria in benthic and pelagic habitats of clear-water lakes. Ecology, 90:1923-1932

Jansson M., T. Hickler, A. Jonsson, J. Karlsson. 2008. Links between terrestrial primary production and lake mineralization and CO2 emission in a climate gradient in subarctic Sweden. Ecosystems, 11:367-376

Klaminder J., K. Yoo, J. Rydberg, R. Giesler. 2008. An explorative study of mercury export from a thawing palsa mire. Journal of Geophysical Research -Biogeosciences, 113

Jonsson A., J. Åberg, A. Lindroth, M. Jansson. 2008. Gas transfer rate and CO2 flux between an unproductive lake and the atmosphere in northern Sweden. Biogeosciences, G04006-10.1029/2008JG000688

Jansson M., L. Persson, A. M. De Roos, R. I. Jones, L. J. Tranvik. 2007. Terrestrial carbon and intraspecific size-variation shape lake ecosystems. Trends in Ecology and Evolution, 22:316-322

Bergström A.-K., M. Jansson. 2006. Atmospheric nitrogen deposition has caused nitrogen enrichment and eutrophication of lakes in the northern hemisphere. Global Change Biology, 12:1-9

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