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| Titel |
Evaluation of seasonal changes in methane flux in a wetland ecosystem using the Closed Geosphere Experiment Facility |
| VerfasserIn |
S. Suzuki, K. Inubushi, M. Yokozawa, T. Hara, K. Nishidate, S. Tsuga, Y. Tako, Y. Nakamura |
| 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 |
250022315
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| Zusammenfassung |
| To estimate CH4 emission from a wetland ecosystem to the atmosphere, seasonal change in
CH4 flux was measured continuously in the Closed Geosphere Experiment Facility (CGEF).
Plant-mediated transport is one of the important pathways for CH4 emission from
Phragmites australis-dominated vegetation because most CH4 emission occurs through
P. australis plant. The CGEF is equipped with a Geosphere Module (GM) and a
Geosphere Material Circulation (GMC) system. The size of the GM is 5.8 m à 8.7
m in ground area with an average height of 11.9 m, including the soil depth of
3.1 m. A wetland ecosystem dominated by P. australis was introduced into the
GM. The CGEF can control air temperature and CO2 concentration in the GM
automatically. Hourly CH4 flux from the wetland ecosystem can be calculated easily by
measuring continuously the changes in CH4 concentration in air, air temperature
and pressure in the GM. The method showed that monthly CH4 flux varied from
0.39 to 1.11 g C m-2 month-1 from April to November and the CH4 emission for
the plant growing season (eight months) was 5.64 g C m-2. The CGEF has an
advantage in studying total CH4 emission from soil to the atmosphere through
plant-mediated transport, diffusion and ebullition because of the large size of the GM. |
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