Methane from rice paddies: isotopic signals, microbial pathways and fluxes

Informazioni relative al progetto

RICEOTOPES

ID dell’accordo di sovvenzione: ENV4970408

Progetto chiuso

Data di avvio 1 Novembre 1997

Data di completamento 31 Ottobre 1999

Finanziato da

• Specific programme of research and technological development in the field of environment and climate, 1994-1998

Costo totale

Nessun dato

Contributo UE

Nessun dato

Coordinato da

UNIVERSITY OF EDINBURGH
United Kingdom

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Risultati sfruttabili

Measurements of seasonal and diurnal cycles in 13C/12C and D/H ratios of methane emissions from rice fields

High precision measurements of the 13C/1 2C and D/H ratios of methane emissions from rice fields in Italy were carried out by mass spectrometry and tunable diode laser absorption spectrometry during two vegetation periods of rice. Significant seasonal variations were found for both isotopic ratios. The results confirm earlier observations by Bergamaschi [1 997] in finding a seasonal cycle with isotopicaly depleted methane in the main growing season and higher values at the beginning and the end of season during drainage of the field. Model simulation shows that this seasonality may be caused mainly by changing the partition between methane transport through plants relatively to the transport by bubbles in combination with changes of the oxidation rate. It was turned out that the D/H ratio is a good parameter for calculating the partition of methane oxidation.