Publications of the University of Eastern Finland Dissertations in Forestry and Natural Sciences
Publications of the University of Eastern Finland Dissertations in Forestry and Natural Sciences
isbn 978-952-61-1351-7
Maija E. Marushchak
Carbon Dioxide, Methane and
Nitrous Oxide Balance of Subarctic Tundra from Plot to Regional Scales
Climate warming and permafrost thaw may lead to increased emissions of greenhouse gases from northern tundra soils. In this work, fluxes of carbon dioxide, methane and nitrous oxide were studied in a subarctic tundra ecosystem. Fluxes were verified at the landscape level by comparing the results of two independent methods and then scaled up over a larger region. The results demonstrate the large heterogeneity of subarctic tundra environment with respect to the green house gas fluxes.
Also, a strong, previously unknown source of nitrous oxide is revealed.
se rt at io n s
| 133 | Maija E. Marushchak | Carbon Dioxide, Methane and Nitrous Oxide Balance of Subarctic Tundra from...Maija E. Marushchak
Carbon Dioxide, Methane and
Nitrous Oxide Balance of
Subarctic Tundra from Plot
to Regional Scales
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Acknowledgements
When I started to collect data for this thesis I was expecting interesting experiences but still I could have only a very faint idea of what it was going to bring along. Several months of field work in Russian tundra, some weeks in trains there and back, hundreds of kilometers of tundra walk with and without a flux chamber, feeling at home in a tiny green cabin in the middle of nowhere. Meeting people in the field and office, on the road, at project meetings and work-shops, talking science and non-science, getting inspired of different ways of working, thinking and solving problems. Hours and hours spent staring at the computer screen, being excited and frustrated and then again excited by the data, seeing how little pieces of information fit together and you get a glimpse of the big picture. Now when the work has been materialized into this book, seeing only my name on the first page feels unfair.
There are many people who have been so important for this piece of work to get done.
My deepest thanks belong to my supervisors Prof. Pertti Martikainen and Dr.
Christina Biasi. You often believed more in me and my data than I did myself. Your experience and advice helped me through difficulties in my work, and your true love for science was a great motivator.
I have been lucky to get a bunch of great people around me to share the everyday ups and downs of doing science. Colleagues in the Biogeochemistry research group and in the CARBO-North community, particularly the wonderful people from Finland, Russia and Denmark with whom I spent time in tundra: thank you! There are many unforgettable moments we have spent together. I want to acknowledge also all the coauthors who participated in preparing the manuscripts included in this thesis. My special thanks go to our department secretaries Kaija Ahonen, Ritva Karhunen and Marja-Leena Patronen, who are able to solve any kind of challenge related to university administration.
I am grateful to Prof. Torben Christensen for his acceptance to serve as an opponent in public defense of this thesis. Prof. Steve Frolking and Dr. Nick Ostle are acknowledged for pre-examination of this work and valuable comments that helped me to do the last important improvements to the manuscript. This work would have not been realized without funding from the EU 6th Framework Program Global Change and Ecosystems (CARBO-North, project contract number 036993), Graduate School in Forest Sciences and Northern Savo Cultural Foundation.
Finally, I thank from my heart my family and friends, who have lived through with me this long process and always shown great interest in what I am doing. Your support has kept me going. I devote this thesis to my husband Igor and our little son Petja. You are the best of the best!
Pori, 18 December 2013.
Maija E. Marushchak
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