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| Titel |
BVOC fluxes from growing and cut grass above a mountain meadow |
| VerfasserIn |
Ines Bamberger, Lukas Hörtnagl, Ralf Schnitzhofer, Martin Graus, Taina Ruuskanen, Markus Müller, Jürgen Dunkl, Georg Wohlfahrt, Armin Hansel |
| 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 |
250033448
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| Zusammenfassung |
| Grasslands comprise natural tropical savannah over managed temperate fields to tundra and
cover over a quarter of the Earth’s land surface. Plant growth, maintenance and
decay result in volatile organic compound (VOCs) emissions to the atmosphere.
Furthermore, biogenic VOCs (BVOCs) are emitted due to various environmental stresses
including cutting and drying during harvesting. Fluxes of BVOCs were measured with a
proton-transfer-reaction–mass-spectrometer (PTR-MS) over temperate mountain grassland in
Stubai Valley (Tyrol, Austria) over one growing season in 2008. VOC fluxes were calculated
from the disjunct PTR-MS data using the virtual disjunct eddy covariance method and the
gap filling method. Methanol showed strong daytime emissions throughout the growing
season. With maximum values of 9.7Â nm2ol1
m s the methanol fluxes from growing grassland
were considerably higher at the beginning of the growing season in June compared
to those measured during October (2.5Â nmo2l1
m s). The cutting and drying of grass
increased the emissions of methanol, up to 30Â nm2ol1
m s. In addition, emissions of
acetaldehyde, up to 10Â nmol
m2s1 and other VOCs were detected during harvesting. |
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