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| Titel |
Role of de novo biosynthesis in ecosystem scale monoterpene emissions from a boreal Scots pine forest |
| VerfasserIn |
R. Taipale, M. K. Kajos, J. Patokoski, P. Rantala, T. M. Ruuskanen, J. Rinne |
| 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 ; 8, no. 8 ; Nr. 8, no. 8 (2011-08-18), S.2247-2255 |
| Datensatznummer |
250006081
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| Publikation (Nr.) |
 copernicus.org/bg-8-2247-2011.pdf |
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| Zusammenfassung |
| Monoterpene emissions from Scots pine have traditionally been assumed to
originate as evaporation from specialized storage pools. More recently, the
significance of de novo emissions, originating directly from monoterpene
biosynthesis, has been recognized. To study the role of biosynthesis at the
ecosystem scale, we measured monoterpene emissions from a Scots pine
dominated forest in southern Finland using the disjunct eddy covariance
method combined with proton transfer reaction mass spectrometry. The
interpretation of the measurements was based on a correlation analysis and
a hybrid emission algorithm describing both de novo and pool emissions.
During the measurement period May–August 2007, the monthly medians of
daytime emissions were 200, 290, 180, and
200 μg m−2 h−1. The emissions were partly light
dependent, probably due to de novo biosynthesis. The emission potential for
both de novo and pool emissions exhibited a decreasing summertime trend. The
ratio of the de novo emission potential to the total emission potential
varied between 30 % and 46 %. Although the monthly changes were not
significant, the ratio always differed statistically from zero, suggesting
that the role of de novo biosynthesis was observable. Given the uncertainties
in this study, we conclude that more accurate estimates of the contribution
of de novo emissions are required for improving monoterpene emission
algorithms for Scots pine dominated forests. |
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