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| Titel |
Seasonal Trace Gas Dynamics on Minerotrophic Fen Peatlands in NE-Germany |
| VerfasserIn |
Michael Giebels, Madlen Beyer, Jürgen Augustin, Merten Minke, Radoszlav Juszczak, Tomasz Serba |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250043854
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| Zusammenfassung |
| In Germany more than 99 % of fens have lost their carbon and nutrient sink function due to
heavy drainage and agricultural land use especially during the last decades and thus resulted
in compression and heavy peat loss (CHARMAN 2002; JOOSTEN & CLARKE 2002;
SUCCOW & JOOSTEN 2001; AUGUSTIN et al. 1996; KUNTZE 1993). Therefore fen
peatlands play an important part (4-5 %) in the national anthropogenic trace gas
budget.
But only a small part of drained and agricultural used fens in NE Germany
can be restored. Knowledge of the influence of land use to trace gas exchange is
important for mitigation of the climate impact of the anthropogenic peatland use.
We study carbon exchanges of several fen peatland use areas between soil and
atmosphere at different sites in NE-Germany. Our research covers peatlands of
supposed strongly climate forcing land use (cornfield and intensive pasture) and of
probably less forcing, alternative types (meadow and extensive pasture) as well
as rewetted (formerly drained) areas and near-natural sites like a low-degraded
fen and a wetted alder woodland. We measured trace gas fluxes with manual and
automatic chambers in periodic routines since spring 2007. The used chamber technique
bases on DROESLER (2005). In total we now do research at 22 sites situated in 5
different locations covering agricultural, varying states of rewetted and near-natural
treatments.
We present results of at least 2 years of measurements and show significant differences in
their annual trace gas balances depending on the genesis of the observed sites and the
seasonal dynamics. Crosswise comparison of different site treatments combined with the
seasonal environmental observations give good hints for the identification of main flux
driving parameters. That is that a reduced intensity in land use as a supposed mitigating
treatment did not show the expected effect, though a normal meadow treatment surprisingly
resulted in the lowest balances in both years. For implementing a further trace gas flux model
observations will proceed at least until the end of year 2011. Regarding restoration sites
we present newly installed locations of observing especially methane fluxes. To
assure our results (presented at last years EGU conference, GIEBELS et al. 2009)
from our in 2005 rewetted site we started observations at sites with advanced states
of rewetting and alternative management respectively. I.e. one alternative aim to
mitigate the heavy methane efflux after rewetting is observed at a site with removed
canopy. Other experiments are conducted by freshly reforested alders and reed
grass.
References:
Augustin, J., Merbach, W., Käding, H., Schnidt, W. & Schalitz, G. 1996. Lachgas- und
Methanemissionen aus degradierten Niedermoorstandorten Nordostdeutschlands unter dem
Einfluß unterschiedlicher Bewirtschaftung. Alfed-Wegener-Stiftung (ed.): Von den
Ressourcen zum Recycling: Geoanalytik-Geomanagement-Geoinformatik. Ernst & Sohn
Verlag. Berlin
Charman, D. 2002: Peatland and environmental change. John Wiley & Sons, LTD,
Chichester
Droesler, M. 2005. Trace Gas Exchange and climatic relevance of bog ecosystems,
Southern Germany, phD-thesis, TU München, München
Giebels, M., Augustin, J., Minke, M., Halle, E., Beyer, M., Ehrig, B., Leitholdt, E.,
Chojnicki, B., Juszczak, R., Serba, T. 2009. Anthropogenic impact on the carbon cycle of fen
peatlands in NE-Germany, EGU General Assembly 2009
Joosten, H. & Clarke, D. 2002: Wise use of mires and peatlands-background and
principles including a framework for decision-making. International Mire Conservation
Group and International Peat Society (eds.), Finland
Kuntze 1993: Moore als Senken und Quellen für C und N, Mitt. Deutsche Bodenkundliche
Gesellschaft 69, 277-280
Succow, M. & Joosten, H. 2001: Landschaftsökologische Moorkunde, 2nd edition,
Schweizerbart’sche Verlagsbuchhandlung, Stuttgart |
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