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The experiment involved measuring oak contributions to overall emissions of volatile organic compounds to the atmosphere in the Mediterranean area. The type and amount of terpenoid emissions (isoprene, monoterpenes and sesquiterpenes) from 14 different Quercus species of Mediterranean origin were measured under standard conditions of light and temperature in controlled environment chambers. Leaf level trace gas exchange was analysed using a minicuvette system and of gas chromatography. The seasonal fluctuations of the emission factors over the year from one species was studied and the relation between the emission types and emission spectra found and the Quercus taxonomy was compared. The holarctic group Lepidobalanus and the North American groups Erythrobalanus and Protobalanus were all found to be strong isoprene emitters. All Eurasian Sclerophyllodrys oaks emit monoterpenes, Cerris oaks include mostly non-emitters, but also an isoprene and a monoterpene emitter has been found in this group. Results are discussed with respect to their implications for presently used emission scenarios.

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Authors: CSIKY O, JRC Ispra (IT);SEUFERT G, JRC Ispra (IT)
Bibliographic Reference: Article: Ecological Applications
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