Small scale controls of greenhouse gas release under elevated N deposition rates in a restoring peat bog in NW Germany
Glatzel, S.
Forbrich, I.
Krüger, C.
Lemke, S.
Gerold, G.
5, 3: 925 - 935
DOI: https://doi.org/10.5194/bg-5-925-2008
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7000
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7000
Glatzel, S.; Forbrich, I.; Krüger, C.; Lemke, S.; Gerold, G., 2008: Small scale controls of greenhouse gas release under elevated N deposition rates in a restoring peat bog in NW Germany. In: Biogeosciences, Band 5, 3: 925 - 935, DOI: 10.5194/bg-5-925-2008.
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In Central Europe, most bogs have a history of
drainage and many of them are currently being restored.
Success of restoration as well as greenhouse gas exchange
of these bogs is influenced by environmental stress factors
as drought and atmospheric nitrogen deposition. We determined
the methane and nitrous oxide exchange of sites in the
strongly decomposed center and less decomposed edge of the
Pietzmoor bog in NW Germany in 2004. Also, we examined
the methane and nitrous oxide exchange of mesocosms from
the center and edge before, during, and following a drainage
experiment as well as carbon dioxide release from disturbed
unfertilized and nitrogen fertilized surface peat. In the field,
methane fluxes ranged from 0 to 3.8 mgm−2 h−1 and were
highest from hollows. Field nitrous oxide fluxes ranged from
0 to 574μgm−2 h−1 and were elevated at the edge. A large
Eriophorum vaginatum tussock showed decreasing nitrous
oxide release as the season progressed. Drainage of mesocosms
decreased methane release to 0, even during rewetting.
There was a tendency for a decrease of nitrous oxide
release during drainage and for an increase in nitrous oxide
release during rewetting. Nitrogen fertilization did not
increase decomposition of surface peat. Our examinations
suggest a competition between vascular vegetation and denitrifiers
for excess nitrogen. We also provide evidence that
the von Post humification index can be used to explain nitrous
oxide release from bogs, if the role of vascular vegetation
is also considered. An assessment of the greenhouse gas
release from nitrogen saturated restoring bogs needs to take
into account elevated release from fresh Sphagnum peat as
well as from sedges growing on decomposed peat. Given the
high atmospheric nitrogen deposition, restoration will not be
able to achieve an oligotrophic ecosystem in the short term.
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