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| Titel |
Monoterpene emissions from boreal tree species: Determination of de novo and pool emissions |
| VerfasserIn |
Andrea Ghirardo, Kristine Koch, Risto Taipale, Ina Zimmer, Joerg-Peter Schnitzler, Janne Rinne |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033553
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| Zusammenfassung |
| Boreal forests emit a large amount of monoterpenes into the atmosphere. Traditionally these
emissions are assumed to originate as evaporation from large storage pools. Thus their diurnal
cycle would depend mostly on temperature. However, there is indication that a
significant part of the monoterpene emission would originate directly from de novo
synthesis.
By applying 13CO2 fumigation and analyzing the isotope fractions with proton
transfer reaction mass spectrometry (PTR-MS) and classical GC-MS we studied the
origin of monoterpene emissions from some major Eurasian boreal and alpine tree
species. We determined the fractions originating from de novo biosynthesis and
from large internal monoterpene storages for three coniferous tree species with
specialized monoterpene storage structures and one dicotyledon species without such
structures.
The emission from dicotyledon species Betula pendula originated solely from the de novo
synthesis. The origin of the emissions from coniferous species was mixed with varying
fraction originating from de novo synthesis (Pinus sylvestris 58 %, Picea abies
33.5 %, Larix decidua 9.8 %) and the rest from large internal monoterpene storage
pools.
We have also measured the ecosystem scale monoterpene emission fluxes from a boreal
Pinus sylvestris forest by disjunct eddy covariance technique. Application of the observed
fraction of emission originating from de novo synthesis and large storage pools in a hybrid
emission algorithm resulted in a better description of ecosystem scale monoterpene
emissions, as compared to the measured fluxes. |
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