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Titel |
Land use influence on GHG balances of minerotrophic 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 |
250019315
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Zusammenfassung |
Fen peatland ecosystems are strongly linked to the matters of greenhouse gas 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 greenhouse gas exchanges (i.e. fluxes) of varying fen
peatland use areas 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 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 and N2O 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 (Figure 1). Other first results show impressive differences in the total
annual CO2 climate balance depending on the land use management (Figure 2).
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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