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| Titel |
Tree water relations can trigger monoterpene emissions from Scots pine stems during spring recovery |
| VerfasserIn |
A. Vanhatalo, T. Chan, J. Aalto, J. F. Korhonen, P. Kolari, T. Holtta, E. Nikinmaa, J. Bäck |
| 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 ; 12, no. 18 ; Nr. 12, no. 18 (2015-09-17), S.5353-5363 |
| Datensatznummer |
250118093
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| Publikation (Nr.) |
 copernicus.org/bg-12-5353-2015.pdf |
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| Zusammenfassung |
| Tree canopies are known to emit large amounts of VOCs (volatile organic
compounds) such as monoterpenes into the surrounding air. High VOC emission
rates from boreal forests have been observed during the transition from
winter to summer activity. The most important sources of these are considered
to be the green foliage, understory vegetation and soil organisms, but
emissions from the living stand woody compartments have so far not been
quantified. We analyzed whether the non-foliar components could partially
explain the springtime high emission rates. We measured the monoterpene
emissions from Scots pine (Pinus sylvestris L.) stem and shoots
during the dehardening phase of trees in field conditions in two consecutive
springs. We observed a large, transient monoterpene burst from the stem,
while the shoot monoterpene emissions remained low. The burst lasted about
12 h. Simultaneously, an unusual nighttime sap flow and a non-systematic
diurnal pattern of tree diameter were detected. Hence, we suggest that the
monoterpene burst was a consequence of the recovery of the stem from
wintertime, and likely related to the refilling of embolized tracheids and/or
phenological changes in the living cells of the stem. This indicates that the
dominant processes and environmental drivers triggering the monoterpene
emissions are different between the stem and the foliage. |
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