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Anna-Karin Björsne

Doctoral student

Anna-Karin Björsne
Doctoral student
anna-karin.bjorsne@gu.se
+46 31 786 2865

Postal Address: Box 460, 40530 Göteborg
Visiting Address: Guldhedsgatan 5 A , 41320 Göteborg


Department of Earth Sciences (More Information)
Box 460
405 30 Göteborg
www.gvc.gu.se
gvc@gvc.gu.se

Visiting Address: Guldhedsgatan 5a , 413 20 Göteborg

About Anna-Karin Björsne

The overall aim of my research is to identify and partition between the microbial soil processes responsible for nitrous oxide emissions in forest soils by means of stable isotopes, and which factors that influence the emissions.

The concentration of nitrous oxide (N2O) is rising in the atmosphere, which is mainly due to that the gas is emitted from soils as a byproduct of microbial processes. This is of major concern, as N2O is a potent and long-lived greenhouse gas and is predicted to be the main cause for stratospheric ozone depletion during the next century.

Models are used to estimate how the N2O emissions are affected by changes in land management. However, models are often adapted to intensive utilized farmlands, where nitrification and denitrification are the processes mainly responsible for the emissions, and not for forests, where the conditions are different. In forests other processes are competing for the nitrogen as well, and N2O is produced as a rest product in many of them. As a large part of the land area in Sweden is covered by forests it is important to learn more about the factors affecting these processes, in order to do adequate model simulations of emissions from forest ecosystems.

The project involves four different experimental sites in Sweden and Denmark, along a climate gradient from north to south. Within each experimental site I will also investigate how the emissions are affected by factors like nitrogen fertilization and tree species. To trace the microbial activity I will collect soil samples from the different sites and label them with the stable nitrogen isotope 15N. The results from the experiments will be analyzed in a tracing model where it is possible to quantify the different processes in the nitrogen cycle.

The knowledge gained by this project will be used for improving the experimental background to models and thereby do more realistic simulations of N2O emissions. Hopefully it will also lead to development of more effective mitigation strategies for N2O emissions.

Latest publications

Effect of climate change on soil nitrogen dynamics in a heathland
Anna-Karin Björsne, Tobias Rütting, Per Ambus
BIOGEOMON 2012, Northport, Maine, USA, 2012-07-16, Poster 2012
Poster

Alteration of gross N dynamics under climate change in a heath-land ecosystem
Anna-Karin Björsne, Tobias Rütting, Per Ambus
NordSIR meeting, 3-5 October 2011, Søminestationen, DK, Conference contribution 2011
Conference contribution

Gross nitrogen dynamics in different soils in a hemiboreal forested catchment area
Tobias Rütting, Anna-Karin Björsne, Elin Julén, Pascal Boeckx, Leif Klemedtsson
Nitrogen & Global Change, Key findings – future challenges, Conference paper 2011
Conference paper

Showing 1 - 6 of 6

2016

2014

2012

Effect of climate change on soil nitrogen dynamics in a heathland
Anna-Karin Björsne, Tobias Rütting, Per Ambus
BIOGEOMON 2012, Northport, Maine, USA, 2012-07-16, Poster 2012
Poster

2011

Alteration of gross N dynamics under climate change in a heath-land ecosystem
Anna-Karin Björsne, Tobias Rütting, Per Ambus
NordSIR meeting, 3-5 October 2011, Søminestationen, DK, Conference contribution 2011
Conference contribution

Gross nitrogen dynamics in different soils in a hemiboreal forested catchment area
Tobias Rütting, Anna-Karin Björsne, Elin Julén, Pascal Boeckx, Leif Klemedtsson
Nitrogen & Global Change, Key findings – future challenges, Conference paper 2011
Conference paper

Showing 1 - 6 of 6

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