 |
| Titel |
BVOC fluxes above mountain grassland |
| VerfasserIn |
I. Bamberger, L. Hörtnagl, R. Schnitzhofer, M. Graus, T. M. Ruuskanen, M. Müller, J. Dunkl, G. Wohlfahrt, A. Hansel |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 5 ; Nr. 7, no. 5 (2010-05-06), S.1413-1424 |
| Datensatznummer |
250004762
|
| Publikation (Nr.) |
 copernicus.org/bg-7-1413-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| Grasslands comprise natural tropical savannah over managed temperate fields
to tundra and cover one 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
as a consequence of 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 (2008).
VOC fluxes were calculated from the disjunct PTR-MS data using the virtual
disjunct eddy covariance method and the gap filling method. Methanol fluxes
obtained with the two independent flux calculation methods were highly
correlated (y = 0.95×−0.12, R2 = 0.92). Methanol showed strong daytime
emissions throughout the growing season – with maximal values of
9.7 nmol m−2 s−1, methanol fluxes from the growing grassland were
considerably higher at the beginning of the growing season in June compared
to those measured during October (2.5 nmol m−2 s−1). Methanol was
the only component that exhibited consistent fluxes during the entire
growing periods of the grass. The cutting and drying of the grass increased
the emissions of methanol to up to 78.4 nmol m−2 s−1. In addition,
emissions of acetaldehyde (up to 11.0 nmol m−2 s−1), and hexenal
(leaf aldehyde, up to 8.6 nmol m−2 s−1) were detected during/after
harvesting. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|