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| Titel |
CO2 Fluxes Monitoring at the Level of Field Agroecosystem in Moscow Region of Russia |
| VerfasserIn |
Joulia Meshalkina, Ilya Mazirov, Miljan Samardžić, Alexis Yaroslavtsev, Riccardo Valentini, Ivan Vasenev |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100788
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| Publikation (Nr.) |
 EGU/EGU2014-16784.pdf |
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| Zusammenfassung |
| The Central Russia is still one of the less GHG-investigated European areas especially in case
of agroecosystem-level carbon dioxide fluxes monitoring by eddy covariance method. The
eddy covariance technique is a statistical method to measure and calculate vertical
turbulent fluxes within atmospheric boundary layers. The major assumption of the
metod is that measurements at a point can represent an entire upwind area. Eddy
covariance researches, which could be considered as repeated for the same area, are very
rare.
The research has been carried out on the Precision Farming Experimental Field of the
Russian Timiryazev State Agricultural University (Moscow, Russia) in 2013 under the
support of RF Government grant No. 11.G34.31.0079. Arable derno-podzoluvisls have
around 1
The results have shown high daily and seasonal dynamic of agroecosystem CO2 emission.
Sowing activates soil microbiological activity and the average soil CO2 emission and
adsorption are rising at the same time.
CO2 streams are intensified after crop emerging from values of 3 to 7 μmol/s-m2 for
emission, and from values of 5 to 20 μmol/s-m2 for adsorption. Stabilization of the flow has
come at achieving plants height of 10-12 cm. The vegetation period is characterized by high
average soil CO2 emission and adsorption at the same time, but the adsorption is significantly
higher. The resulted CO2 absorption during the day is approximately 2-5 times higher than
emissions at night. For example, in mid-June, the absorption value was about 0.45 mol/m2
during the day-time, and the emission value was about 0.1 mol/m2 at night. After
harvesting CO2 emission is becoming essentially higher than adsorption. Autumn and
winter data are fluctuate around zero, but for some periods a small predominance of
CO2 emissions over the absorption may be observed. The daily dynamics of CO2
emissions depends on the air temperature with the correlation coefficient changes
between 0.4 and 0.8. Crop stage, agrotechnological operation and soil moisture
has stronger influence on the seasonal dynamics of soil and agroecosystem CO2
emissions.
Obtained unique for Russian agriculture data are very useful for land-use practices
environmental assessment, for soil organic carbon dynamics analysis and agroecological
evaluation, and for food C-footprint calculation. Their system analysis together with the
nearest forest eddy covariance stations helps us to understand better the land-use change
impact on the GHG fluxes dynamics and ecosystem services. |
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