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| Titel |
Irreversible impacts of heat on the emissions of monoterpenes, sesquiterpenes, phenolic BVOC and green leaf volatiles from several tree species |
| VerfasserIn |
E. Kleist, T. F. Mentel, S. Andres, A. Bohne, A. Folkers, A. Kiendler-Scharr, Y. Rudich, M. Springer, R. Tillmann, J. Wildt |
| 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 ; 9, no. 12 ; Nr. 9, no. 12 (2012-12-13), S.5111-5123 |
| Datensatznummer |
250007460
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| Publikation (Nr.) |
 copernicus.org/bg-9-5111-2012.pdf |
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| Zusammenfassung |
Climate change will induce extended heat waves to parts of the vegetation
more frequently. High temperatures may act as stress (thermal stress) on
plants changing emissions of biogenic volatile organic compounds (BVOCs). As
BVOCs impact the atmospheric oxidation cycle and aerosol formation, it is
important to explore possible alterations of BVOC emissions under high
temperature conditions. Applying heat to European beech, Palestine oak,
Scots pine, and Norway spruce in a laboratory setup either caused the
well-known exponential increases of BVOC emissions or induced irreversible
changes of BVOC emissions. Considering only irreversible changes of BVOC
emissions as stress impacts, we found that high temperatures decreased the
de novo emissions of monoterpenes, sesquiterpenes and phenolic BVOC. This behaviour
was independent of the tree species and whether the de novo emissions were
constitutive or induced by biotic stress.
In contrast, application of thermal stress to conifers amplified the release
of monoterpenes stored in resin ducts of conifers and induced emissions of
green leaf volatiles. In particular during insect attack on conifers, the
plants showed de novo emissions of sesquiterpenes and phenolic BVOCs, which exceeded
constitutive monoterpene emissions from pools. The heat-induced decrease of
de novo emissions was larger than the increased monoterpene release caused by
damage of resin ducts. For insect-infested conifers the net effect of
thermal stress on BVOC emissions could be an overall decrease.
Global change-induced heat waves may put hard thermal stress on plants. If
so, we project that BVOC emissions increase is more than predicted by models
only in areas predominantly covered with conifers that do not emit high
amounts of sesquiterpenes and phenolic BVOCs. Otherwise overall effects of
high temperature stress will be lower increases of BVOC emissions than
predicted by algorithms that do not consider stress impacts. |
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