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| Titel |
EC-Measurements of CO2, CH4 and N2O over a Maize field |
| VerfasserIn |
Christoph Thieme, Florian Heinlein, Christian Klein, Eckart Priesack |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250125286
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| Publikation (Nr.) |
 EGU/EGU2016-4848.pdf |
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| Zusammenfassung |
| In order to quantify the full greenhouse gas balance of an agroecosystem, all relevant
greenhouse gases (CO2, CH4, N2O), which are exchanged between the land surface and the
atmosphere, have to be measured. To achieve this, an eddy covariance system in
combination with a Quantum cascade laser was setup at agricultural fields of the
TERENO Research Station Scheyern, 40 km north of Munich. The advantages
of this approach are that greenhouse gases fluxes are measured i) continuously
and at high frequency ii) at the field scale and iii) with minimal disturbance of the
ecosystem.
The EC-Station was set up with a 3D-anemometer (CSAT3), an open path infrared gas
analysator for CO2-fluxes (LICOR7500) and a closed path analyser for CH4- and
N2O-fluxes (QCL-TILDAS, Aerodyne Research Inc., Billerca Massachusetts). Additionally,
soil water content, soil water tension, soil temperature, soil surface temperature,
air temperature, relative humidity, wind speed and many more parameters were
measured.
We present the results for a whole vegetation period for which we recorded fluxes for all
three greenhouse gases (2014-1/2015-10). Expected high N2O emissions due to
frost thaw events could not be detected during 2014/2015. However, N2O-flux
up to 38 nmol m−2s−1 have been measured after N-fertilization and during wet
periods with high water contents of the top soil. Molar CH4-fluxes exceeded molar
N2O-fluxes regularly, but their greenhouse gas potential was lower than that of the N2O
fluxes. |
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