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| Titel |
Seasonal variation of mono- and sesquiterpene emission rates of Scots pine |
| VerfasserIn |
H. Hakola, V. Tarvainen, J. Bäck, H. Ranta, B. Bonn, J. Rinne, M. Kulmala  |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2006-03-13), S.93-101 |
| Datensatznummer |
250000734
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| Publikation (Nr.) |
 copernicus.org/bg-3-93-2006.pdf |
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| Zusammenfassung |
| The seasonal variation of mono-and sesquiterpene emission rates of Scots
pine was measured from April to October in 2004. The emission rates were
measured daily in the afternoons with the exception of weekends. Emissions
were measured from two branches; one of them was debudded in May (branch A),
while the other was allowed to grow new needles (branch B). The monoterpene
emission pattern remained almost constant throughout the measurement period,
Δ3-carene being the dominant monoterpene (50-70% of the VOC
emission). The standard monoterpene emission potential (30°C) was
highest during early summer in June (the average of the two branches
1.35 µg g-1h-1) and lowest during early autumn in September (the
average of the two branches 0.20 µg g-1h-1. The monoterpene
emission potential of branch A remained low also during October, whereas the
emission potential of branch B was very high in October. The sesquiterpenes
were mainly emitted during mid summer, the dominant sesquiterpene being
β-caryophyllene. Branch A had a higher sesquiterpene emission
potential than branch B and the emission maximum occurred concomitant with
the high concentration of airborne pathogen spores suggesting a potential
defensive role of the sesquiterpene emissions. The sesquiterpene emissions
were well correlated with linalool and 1,8-cineol emissions, but not with
monoterpenes. Sesquiterpene and 1,8-cineol emissions were equally well
described by the temperature dependent and the temperature and light
dependent algorithms. This is due to the saturation of the light algorithm
as the measurements were always conducted during high light conditions. |
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