Diurnal and seasonal variations in isoprene emission from live oak.

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The emission rate of isoprene from an oak tree (Quercus serrata) in the field was measured at almost hourly intervals during daytime. The emission showed an marked diurnal variation with a maximum around noontime. More than 80% of daily emission occurred between 10:00 and 14:00. The emission rate correlated with light intensity, and their relationship could be described by a simple hyperbolic function. The daily isoprene emission showed a seasonal variation with a maximum in September. This seasonal variation differed considerably from the one presumed from average monthly temperatures, indicating the need of a check of seasonal variations in the case of the estimation of annual emission rate from vegetation.
日本地球化学会の論文