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We studied whole canopy emissions of terpenoids from young Pinus pinea trees during a 15-month enclosure experiment in the JRC-CSTR chambers. We observed a strong seasonality of emissions with a summer/winter ratio of 200 under ambient conditions and of 45 after normalising emissions to standard conditions of light and temperature exposure. Part of the emission (ocimene, linalool, cineol) was only during the vegetative period during the day, other compounds were emitted under temperature control throughout the year, indicating different terpene sources and processes in the pine foliage. We propose a general model to simulate both light/temperature and seasonal controls over emission. The model is tested on field data and discussed for its general application.

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Authors: STAUDT ET AL, Evironment Institute, JRC, Ispra (ES);FRENZEL B, Institute for Botany, University of Hohenheim (DE)
Bibliographic Reference: Article: Journal of Atmospheric Chemistry 35: 2000, pp 77-99
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