Plant-specific volatile organic compound emission rates from young and mature leaves of Mediterranean vegetation

摘要: [1] The seasonality of vegetation, i.e., developmental stages and phenological processes, affects the emission volatile organic compounds (VOCs). Despite potential significance, contributions to VOC quality quantity are not well understood therefore often ignored in simulations. We investigated patterns young mature leaves several Mediterranean plant species relation their physiological changes during growing period estimated Es. Foliar emissions isoprenoids oxygenated VOCs like methanol acetone were measured online by means a proton transfer reaction mass spectrometer (PTR-MS) offline with gas chromatography coupled flame ionization detector. The results suggest that is developmentally regulated process quantitative qualitative variability specific. Leaf ontogeny clearly influenced both Es relative importance different VOCs. Methanol was major compound contributing sum target (11.8 ± 10.4 μg g−1 h−1), while its contribution minor (4.1 4.1 h−1). Several showed decrease or complete subsidence monoterpene, sesquiterpene, upon maturity, perhaps indicating response higher defense demands emerging leaves.