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| Titel |
Relationship of soil CO2 efflux and water table in the wetland |
| VerfasserIn |
E. Darenová, M. Pavelka |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062667
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| Zusammenfassung |
| Wetlands are an important reserve of carbon due to slow decomposition caused by a high
water table. Possible climate changes (such as temperature or rainfall distribution) can
significantly affect wetland ecosystems and their carbon balance.
Continuous measurements of soil CO2 efflux, soil temperature in the depth of 1.5 cm and
water table were carried out during six days in September 2010 on wetland Mokre louky in
the South Bohemia. The wetland is situated in the inundation area of a large human-made
lake Rozmberk. The measurements of soil CO2 efflux were carried out using automated
chamber. That was placed between hummocks of Carex tussocks For five days of
measurements the water table slowly decreased from 0.4 cm above the soil surface up to 8.0
cm below the soil surface. Simultaneously soil CO2 efflux and R10 (soil CO2 efflux
normalized for temperature of 10 Ë C) gradually increased. Then the heavy rain caused an
increase in water table over 4 cm above the soil surface. This was followed by a fast
decrease in soil CO2 efflux up to nearly zero. On the base of measured soil CO2 efflux,
soil temperature and water table a model of soil CO2 efflux was created to predict
changes of soil CO2 efflux in dependence on external factors. The difference in
cumulative CO2 production got from measured and modeled data was only 1.2
%.
Acknowledgements
This work was supported by projects CzechGlobe (CZ.1.05/1.1.00/02.0073) and CzeCOS
(LM2010007) |
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