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| Titel |
Drought induced methanol emission from grassland |
| VerfasserIn |
M. Walser, I. Bamberger, L. Hörtnagl, G. Wohlfahrt, A. Hansel |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068018
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| Zusammenfassung |
| In near future air temperature is expected to increase during the growing season and growing
conditions could become more arid in many parts of the world. Since the air temperature and
the photosynthetically active radiation are the main drivers for the emission of many biogenic
volatile organic compounds (BVOC), this may be expected to lead to a change in the
emission patterns.
To investigate the effects of drought on BVOC-emissions from mountain grassland we
analysed the emission patterns during a whole vegetation period from March 2011 to
December 2011. BVOC-concentrations were measured at a height of 2.4 m above the ground
by means of a proton-transfer-reaction mass spectrometer and then combined with
3D wind data from a sonic anemometer. Half-hourly net BVOC fluxes (composed
of grass and soil emissions) were calculated using the disjunct eddy covariance
method.
As a result of a dry period in May 2011 the soil water content dropped below 0.1 m3/m3 and
methanol emissions increased significantly. In addition, on certain SWC-levels indication of
methanol-consuming microbiological activities in the soil and on the leaves was
found. |
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