| Title: | Compartment specific chiral pinene emissions identified in a Maritime pine forest |
| Author(s): | Staudt M; Byron J; Piquemal K; Williams J; |
| Address: | "Centre d'Ecologie Fonctionnelle et Evolutive UMR 5175, CNRS - Universite de Montpellier - Universite Paul-Valery Montpellier - EPHE Campus CNRS, 1919 Route de Mende, F-34293 Montpellier cedex 5, France. Electronic address: michael.staudt@cefe.cnrs.fr. Max-Planck-Institut fur Chemie, Hahn-Meitner-Weg 1, 55128 Mainz, Germany. Centre d'Ecologie Fonctionnelle et Evolutive UMR 5175, CNRS - Universite de Montpellier - Universite Paul-Valery Montpellier - EPHE Campus CNRS, 1919 Route de Mende, F-34293 Montpellier cedex 5, France" |
| DOI: | 10.1016/j.scitotenv.2018.11.146 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "To track unknown sources and sinks of volatile organic compounds (VOCs) inside forest canopies we measured diel cycles of VOC exchanges in a temperate maritime forest at the branch, stem and ground level with special focus on the chiral signatures of pinenes. All compartments released day and night alpha- and beta-pinene as major compounds. In addition, strong light dependent emissions of ocimene and linalool from branches occurred during hot summer days. In all compartments the overall emission strength of pinenes varied from day to day spanning 1 to 2 orders of magnitude. The highest pinene emissions from ground and stem were observed during high moisture conditions. Despite this variability stem emissions consistently expressed a different chiral composition than branch emissions, the former containing a much larger fraction of (-)-enantiomers than the latter. Pinene emissions from dead needle litter and soil were mostly enriched in (-)-enantiomers, while the chiral signatures of the ambient air inside the forest showed mostly intermediate levels compared to the emission signatures. These findings suggest that different organ-specific pinene producing enzymes exist in Maritime pine, and indicate that emissions from ground and stem compartments essentially contribute to the canopy VOC flux. Overall the results open new perspectives to explore chirality as a possible marker to recognize shifts in the contributions of different VOC sources present within forest ecosystems and to explain observed temporal changes in the chiral signature of pinenes in the atmosphere" |
| Keywords: | Acyclic Monoterpenes Air Pollutants/*analysis Atmosphere Bicyclic Monoterpenes Bridged Bicyclo Compounds/*analysis *Environmental Monitoring *Forests Monoterpenes/*analysis *Pinus Volatile Organic Compounds/*analysis Conifer Enantiomers Litter Soil Stem V; |
| Notes: | "MedlineStaudt, Michael Byron, Joseph Piquemal, Karim Williams, Jonathan eng Netherlands 2019/03/08 Sci Total Environ. 2019 Mar 1; 654:1158-1166. doi: 10.1016/j.scitotenv.2018.11.146. Epub 2018 Nov 10" |
