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Large scale variations in CH4 emissions from wetlands explained by temperature and substrate availability
Climate Impacts Group, Department of Ecology, Lund University.
Climate Impacts Group, Department of Ecology, Lund University.
Climate Impacts Group, Department of Ecology, Lund University.
Climate Impacts Group, Department of Ecology, Lund University. Institute of Microbiology,Russian Academy of Sciences, Moscow.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Globally, wetlands are at estimates ranging 115-237 Tg C4/yr1 the largest single source of the greenhouse gas CH4 to the atmosphere. Important feedback mechanisms on climate change arising from changing exchanges of C02 between the terrestrial biosphere and the atmosphere have recently been identified2. A related question is how will possible changes in the CH4 emissions from wetlands affect the further development of the greenhouse effect? Here we show using comparable methods in a wide range of wetlands ranging from Greenland to Siberia that regardless the dependency on soil moisture, plant productivity and other factors, temperature is the strongest control and predictor of CH4 emissions across both temporal and large spatial scales. Furthermore, we show that CH4 flux variations not explained by temperature can beattributed to differences in microbial substrate availability (expressed as the organic acid concentration in peat water). Combined, soil temperature and organic acid concentrations explains 99% of the variation in CH4 fluxes between the different sites. The temperature sensitivity of the CH4 emissions shown suggests a strong feedback mechanism on climatechange that should valid incorporation in developments of global circulation models.

National Category
Social Sciences Interdisciplinary
Identifiers
URN: urn:nbn:se:liu:diva-79157OAI: oai:DiVA.org:liu-79157DiVA: diva2:538503
Available from: 2012-06-29 Created: 2012-06-29 Last updated: 2012-06-29Bibliographically approved
In thesis
1. Northern peatland carbon biogeochemistry: the influence of vascular plants and edaphic factors on carbon dioxide and methane exchange
Open this publication in new window or tab >>Northern peatland carbon biogeochemistry: the influence of vascular plants and edaphic factors on carbon dioxide and methane exchange
2001 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The interest in carbon dynamics and the interactions between ecosystems and the atmosphere has increased during the last decade due to the postulated threat of anthropgenically induced global and climate change. Northern peatlands, with their large stores of organic carbon and long-term net accumulation of atmospheric carbon dioxide are key ecosystems in these interactions. Furthermore, peatlands transform organic carbon to methane, which also is an important greenhouse gas.

The findings reported in this thesis and in the accompanying papers are based on both laboratory and field investigations of carbon transformation dynamics on the process scale and at the resolution of individual peatland plant communities. The data from one of the studies also is extrapolated in an attempt to identify environmental controls on regional scales in order to predict the response of northern pcatlands to climate warming.

The laboratory experiments focus on how climate variations, inducing fluctuations in groundwater level and also soil freeze-thaw cycles, influences organic matter mineralisation to carbon dioxide and methane. The field studies investigate year-to-year variations and interdecadal differences in carbon gas exchange at a subarctic peatland, and also how the physiological activities of vascular plants control methane emission rates.

The main conclusions presented include:

Soil freeze-thaw events may be very important for the annual carbon balance in northern peatlands, because they have the potential to increase mineralisation rates and alter biogeochemical degradation pathways.

Vascular plants exert a strong influence on methane flux dynamics during the growing season, both by mediating methane transport and through substrate-based interactions with the soil microbial community. However, there are important species-related factors that govern the nature and extent of this influence.

Caution has to be taken when extrapolating field data to estimate regional carbon exchange because the relevance of the specific environmental parameters that control this exchange varies depending on resolution. On broad spatial and temporal scales the best predictor of peatland methane emissions is mean soil temperature, but also microbial substrate availability (expressed as the organic acid concentration in peat water) is of importance. This temperature sensitivity represents a strong potential feedback mechanism on climate change.

Place, publisher, year, edition, pages
Linköping: Linköpings Universitet, 2001. 44 p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 245Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 729
Keyword
Biogeokemi, Biologi, Autekologi, Klimatologi
National Category
Social Sciences Interdisciplinary
Identifiers
urn:nbn:se:liu:diva-29578 (URN)14954 (Local ID)91-7373-233-8 (ISBN)14954 (Archive number)14954 (OAI)
Public defence
2001-12-14, Sal Elysion, Hus-T, Universitetsområdet Valla, Linköping, 10:00 (English)
Opponent
Supervisors
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2014-08-28Bibliographically approved

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Svensson, Bo H.

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