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| Titel |
Laboratory and field measurements of enantiomeric monoterpene emissions as a function of chemotype, light and temperature |
| VerfasserIn |
W. Song, M. Staudt, I. Bourgeois, J. Williams |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 5 ; Nr. 11, no. 5 (2014-03-14), S.1435-1447 |
| Datensatznummer |
250117280
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| Publikation (Nr.) |
 copernicus.org/bg-11-1435-2014.pdf |
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| Zusammenfassung |
| Plants emit significant amounts of monoterpenes into the
earth's atmosphere, where they react rapidly to form a multitude of gas phase
species and particles. Many monoterpenes exist in mirror-image forms or
enantiomers. In this study the enantiomeric monoterpene profile for several
representative plants (Quercus ilex L., Rosmarinus officinalis L.,
and Pinus halepensis Mill.) was investigated as a function of
chemotype, light and temperature both in the laboratory and in the field.
Analysis of enantiomeric monoterpenes from 19 Quercus ilex
individuals from Southern France and Spain revealed four regiospecific
chemotypes (genetically fixed emission patterns). In agreement with previous
work, only Quercus ilex emissions increased strongly with light.
However, for all three plant species no consistent enantiomeric variation was
observed as a function of light, and the enantiomeric ratio of α-pinene was found to vary by less than 20% from 100 and
1000 μmol m−2 s−1 PAR (photosynthetically active
radiation). The rate of monoterpene emission increased with temperature from
all three plant species, but little variation in the enantiomeric
distribution of α-pinene was observed with temperature. There was
more enantiomeric variability between individuals of the same species than
could be induced by either light or temperature. Field measurements of
α-pinene enantiomer mixing ratios in the air, taken at a
Quercus ilex forest in Southern France, and several other previously
reported field enantiomeric ratio diel cycle profiles are compared. All show
smoothly varying diel cycles (some positive and some negative) even over
changing wind directions. This is surprising in comparison with variations of
enantiomeric emission patterns shown by individuals of the same species. |
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