Amelynck, C

Demarcke, Marie

Dewulf, Jo

Joó, Éva

Lemeur, Raoul

Müller, JF

Samson, R

Schoon, N

Simpraga, Maja

Steppe, Kathy

Van Langenhove, Herman

English

Ghent University Academic Bibliography

Geophysical Research Abstracts,Vol. 11, EGU2009-2344-4, 2009EGU General Assembly 2009© Author(s) 2009Branch enclosure BVOC flux measurements from Fagus sylvatica L. in anatural forest environment: preliminary resultsM. Demarcke (1), C. Amelynck (1), N. Schoon (1), J.-F. Müller (1), E. Joo (2), J. Dewulf (2), H. Van Langenhove(2), M. Šimpraga (3), K. Steppe (3), R. Lemeur (3), and R. Samson (4)(1) Belgian Institute for Space Aeronomy, Brussels, Belgium (marie.demarcke@aeronomie.be), (2) Research GroupEnvironmental Organic Chemistry and Technology (EnVOC), Faculty of Bioscience Engineering, Ghent University, Ghent,Belgium, (3) Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium, (4)Department of Bioscience Engineering, Faculty of Science, University of Antwerp, Antwerp, BelgiumNatural ecosystems, such as forests, are known to be important sources of non-methane volatile organic com-pounds (NMVOCs). Oxidation of these biogenic VOCs (BVOCs) in the presence of nitrogen oxides can resultin net ozone formation and the low-volatility oxidation products may contribute to secondary organic aerosolformation and/or growth. As a result BVOC emissions can have a negative effect on air quality and human health.In the commonly used emission algorithms [Guenther et al., 1995], leaf temperature and photosynthetic photonflux density (PPFD) are the driving variables for BVOC emissions. However, in order to better explain thevariability over time of BVOC emissions for a given tree species, the most recent emission algorithms, such asMEGAN [Guenther et al., 2006], also consider other driving variables such as phenology, temperature and lighthistory.To validate these new emission algorithms, dynamic branch enclosure BVOC flux measurements have beenperformed on an adult Fagus sylvatica L. tree in a natural forest environment under ambient PPFD and temperatureconditions. Branches at different levels in the canopy were accessible from a 35 m high measurement tower. Thecuvette air was analysed on-line with a hs-PTR-MS instrument, which was located in a log cabin at the bottom ofthe tower.Ion signals related to monoterpenoid compounds (m/z 81 and 137), isoprene (m/z 69), acetone (m/z 59) andmethanol (m/z 33) have been measured continuously with the PTR-MS during several phenological periods, frombud-break to senescence. The data show high monoterpenoid emission rates in spring which gradually decreaseuntil leaf fall.Furthermore, monoterpenoid emissions from shaded leaves in the lower layers of the canopy were found to benegligible compared to those from sunlit leaves in the upper layer of the canopy.Effects of light and temperature history on monoterpenoid emissions from Fagus sylvatica L. will be discussedand compared with results obtained in a growth room under controlled conditions of light and temperature.Guenther et al., J. Geophys. Res. 100 (1995) 8873-8892.Guenther et al., Atm. Chem. Phys. 6 (2006) 3181-3210.The authors gratefully acknowledge the support from the Belgian Science Policy through the Program“Science for a Sustainable Development: Terrestrial Ecology” (contract # SD/TE/03A) and from the “FondsWetenschappelijk Onderzoek – Vlaanderen” (contract # G.0031.07).

Branch enclosure BVOC flux measurements from Fagus sylvatica L. in a natural forest environment: preliminary results

https://biblio.ugent.be/publication/680730/file/751168.pdf

Branch enclosure BVOC flux measurements from Fagus sylvatica L. in a natural forest environment: preliminary results

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