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| Titel |
Artificial drainage and associated carbon fluxes (CO2/CH4) in a tundra ecosystem |
| VerfasserIn |
Lutz Merbold, Werner Leo Kutsch, Chiara Corradi, Olaf Kolle, Corinna Rebmann, Paul C. Stoy, Sergej A. Zimov, Ernst-Detlef Schulze |
| 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 |
250032889
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| Zusammenfassung |
| Ecosystem flux measurements using the eddy covariance (EC) technique were undertaken in
4 subsequent years during summer for a total of 562 days in an arctic wet tundra ecosystem,
located near Cherskii, Far-Eastern Federal District, Russia. Methane (CH4) emissions were
measured using permanent chambers. The experimental field is characterized by late thawing
of permafrost soils in June and periodic spring floods. A stagnant water table below the grass
canopy is fed by melting of the active layer of permafrost and by flood water. Following 3
years of EC measurements, the site was drained by building a 3m wide drainage channel
surrounding the EC tower to examine possible future effects of global change on
the tundra tussock ecosystem. Cumulative summertime net carbon fluxes before
experimental alteration were estimated to be about +115 gCm-2 (i.e. an ecosystem C
loss) and +18 gCm-2 after draining the study site. When taking CH4 as another
important greenhouse gas into account and considering the global warming potential
(GWP) of CH4 vs. CO2, the ecosystem had a positive GWP during all summers.
However CH4 emissions after drainage decreased significantly and therefore the
carbon related greenhouse gas flux was much smaller than beforehand (475 ± 253
gC-CO2-em-2 before drainage in 2003 vs. 23 ± 26 g C-CO2-em-2 after drainage in 2005). |
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