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| Titel |
The atmospheric potential of biogenic volatile organic compounds from needles of white pine (Pinus strobus) in Northern Michigan |
| VerfasserIn |
S. Toma, S. Bertman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 4 ; Nr. 12, no. 4 (2012-02-29), S.2245-2252 |
| Datensatznummer |
250010750
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| Publikation (Nr.) |
 copernicus.org/acp-12-2245-2012.pdf |
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| Zusammenfassung |
| The key role that biogenic volatile organic compounds (BVOC) play in
atmospheric chemistry requires a detailed understanding of how BVOC
concentrations will be affected by environmental change. Large-scale
screening of BVOC emissions from whole forest ecosystems is difficult with
enclosure methods. Leaf composition of BVOC, as a surrogate for direct
emissions, can more easily reflect the distribution of BVOC compounds in a
forest. In this study, BVOC composition in needles of 92 white pine trees
(Pinus strobus), which are becoming a large part of Midwest forests, are
tracked for three summers at the University of Michigan Biological Station
(UMBS). α-Pinene, the dominant terpene in all samples, accounts for
30–50% of all terpenes on a mole basis. The most abundant
sesquiterpenoid was a C15 alcohol identified as germacrene D-4-ol. The
relationship between limonene and total other monoterpenes shows two
distinct trends in the population of these forests. About 14% (n = 13) of
the trees showed high levels of limonene (up to 36% of the total BVOC) in
the same trees every year. Assuming that needle concentrations scale with
emission rate, we estimate that hydroxyl radical reactivity due to reaction
with monoterpenes from white pine increases approximately 6% at UMBS when
these elevated concentrations are included. We suggest that chemotypic
variation within forests has the potential to affect atmospheric chemistry
and that large-scale screening of BVOC can be used to study the importance
of BVOC variation. |
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