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| Titel |
Contrasting carbon dioxide fluxes between a drying shrub wetland in Northern Wisconsin, USA, and nearby forests |
| VerfasserIn |
B. N. Sulman, A. R. Desai, B. D. Cook, N. Saliendra, D. S. Mackay |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 6 ; Nr. 6, no. 6 (2009-06-25), S.1115-1126 |
| Datensatznummer |
250003843
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| Publikation (Nr.) |
 copernicus.org/bg-6-1115-2009.pdf |
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| Zusammenfassung |
| Wetland biogeochemistry is strongly influenced by water and temperature
dynamics, and these interactions are currently poorly represented in
ecosystem and climate models. A decline in water table of approximately
30 cm was observed at a wetland in Northern Wisconsin, USA over a period
from 2001–2007, which was highly correlated with an increase in daily soil
temperature variability. Eddy covariance measurements of carbon dioxide
exchange were compared with measured CO2 fluxes at two nearby forests
in order to distinguish wetland effects from regional trends. As wetland
water table declined, both ecosystem respiration and ecosystem production
increased by over 20% at the wetland, while forest CO2 fluxes had no
significant trends. Net ecosystem exchange of carbon dioxide at the wetland
was not correlated with water table, but wetland evapotranspiration decreased
substantially as the water table declined. These results suggest that changes
in hydrology may not have a large impact on shrub wetland carbon balance over
inter-annual time scales due to opposing responses in both ecosystem respiration and productivity. |
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