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

Informations projet

RICEOTOPES

N° de convention de subvention: ENV4970408

Projet clôturé

Date de début 1 Novembre 1997

Date de fin 31 Octobre 1999

Financé au titre de

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

Coût total

Aucune donnée

Contribution de l’UE

Aucune donnée

Coordonné par

UNIVERSITY OF EDINBURGH
United Kingdom

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Résultats exploitables

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.