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| Titel |
Anthropogenic impact on the carbon cycle of fen peatlands in NE-Germany |
| VerfasserIn |
M. Giebels, J. Augustin, M. Minke, E. Halle, M. Beyer, B. Ehrig, E. Leitholdt, B. Chojnicki, R. Juszczak, T. Serba |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019314
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| Zusammenfassung |
| Fen peatland ecosystems are strongly linked to the matters of carbon cycle dynamics as they
are known to be former strong carbon and nutrient sinks and take part in the cycle of the
common greenhouse gases carbon dioxide (CO2), methane (CH4) and dinitrousmonoxide
(N2O). In Germany more than 99 % of fens have lost their 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). 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.
Therefore we study carbon exchanges (i.e. fluxes) of varying 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 int. pasture)
and of probably less forcing, alternative types (meadow and ext. 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 contrast to our expectations most land use sites
in an area of deeply drained fens in NE-Germany, were flooded during summer
2007 due to exceptional heavy rain and water mismanagement. Thus, emissions
of CO2 of the flooded sites were lower compared to the not flooded because of
the anaerobic environment. But due to the abnormal high methane emissions their
climate balance was even worse. Other first results show impressive differences
in the total annual CO2 climate balance depending on the land use management.
Reflooded fen sites show a significant increase of CH4 emissions in their first years of
rewetting.
References:
Augustin, J., Merbach, W., K |
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