Amelynck, Crist

Demarcke, Marie

Dewulf, Jo

Joó, Éva

Lemeur, Raoul

Müller, J-F

Samson, R

Schoon, Niels

Simpraga, Maja

Steppe, Kathy

Van Langenhove, Herman

English

Ghent University Academic Bibliography

Geophysical Research Abstracts,Vol. 10, EGU2008-A-00000, 2008EGU General Assembly 2008© Author(s) 2008Preliminary observations of temperature effects oncarbon loss through BVOC emissions in Fagus sylvaticaL.Šimpraga M. (1), Steppe K. (1), Demarcke M. (2), Amelynck C. (2), Schoon N. (2),Joó E. (3), Dewulf J. (3), Vanlangenhove H. (3), Samson R. (4), Müller J.-F. (2),Lemeur R. (1)(1) Laboratory of Plant Ecology, Faculty of Bioscience engineering, Ghent University, Ghent,Belgium, (2) Belgian Institute for Space Aeronomy, Brussels, Belgium, (3) Research GroupEnvironmental Organic Chemistry and Technology, Faculty of Bioscience Engineering, GhentUniversity, Ghent, Belgium, (4) Department of Bioscience Engineering, Faculty of Science,University of Antwerp, Antwerp, Belgium (maja.simpraga@ugent.be/ Fax: +32 9 224 44 10 /+32 9 264 61 13 )Plants emit an essential fraction of their carbon fixed by photosynthesis into the at-mosphere as biogenic volatile organic compounds (BVOCs). These BVOCs are di-verse, including isoprene, monoterpenes and sesquiterpenes among others, and theycan be synthesized directly from photosynthetic carbon in the chloroplasts (Licht-enthaler 1999, Loreto et al. 2001). When released into the atmosphere via stomata(Rennenberg et al. 2002, Tani et al. 2007), they represent a large carbon loss, whichcan be up to ∼10% of that fixed by photosynthesis (Sharkey et al. 1995; Penˇuelas etal. 2003; Firn et al. 2006). It is expected that this species-specific carbon loss throughBVOC emission, and thus the plant’s C-budget, might change with global warmingand rising temperatures.The effect of temperature on carbon loss through BVOC emissions at constant dailyPAR was therefore studied in a 3-year-old potted beech tree (Fagus sylvatica L.) ina walk-in growth room. BVOC emissions and simultaneous net photosynthesis rateswere monitored on-line using enclosed branch measurements. Two branch cuvettesequipped with a sensor for PAR, relative humidity, air temperature and leaf temper-ature were used. An infrared gas analyzer (IRGA BINOS 100-4P, Walz, Germany)was used to measure net photosynthesis rates, while a proton transfer reaction massspectrometer (PTR-MS, Ionicon, Austria) was used to monitor BVOC emissions. Airtemperature in the growth room was constant during the day, but varied from 17 to 25˚C between days. Pronounced dynamics, following the imposed temperature regimes,were observed in the continuous measurements of photosynthesis and monoterpenes.These dynamics show the interdependence between monoterpene emissions and theplant’s metabolic processes. The results also revealed that the potted beech tree un-der well-watered conditions re-emitted a rather low fraction of the assimilated carbonback into the atmosphere as monoterpenes. This fraction increased from 0.01 to 0.04% with a temperature rise from 17 ˚C to 25 ˚C in growth room conditions.We would like to express our acknowledgements to BELSPO (Belgian Science Policy)for funding the IMPECVOC research project and Philip Deman, technician of thePlant Ecology Laboratory, for technical support.Firn et al. 2006: Trends in Plant Science, Vol.11, No.3.Lichtenthaler 1999: Annual Review of Plant Physiology Plant Molecular Biology, 50,47-65.Loreto et al. 2001: Global Change Biology, 7, 709-717.Penˇuelas et al. 2003: Trends in Plant Science, Vol.3, No.3.Rennenberg et al. 2002: New Phytologist, 155, 197-203.Sharkey et al. 1995: Nature, 374, 769.Tani et al. 2007: Atmospheric Environment, 41, 1736-1746.

Preliminary observations of temperature effects on carbon losses throught BVOC emissions in Fagus sylvatica L.

https://biblio.ugent.be/publication/1208460/file/1209475

Preliminary observations of temperature effects on carbon losses throught BVOC emissions in Fagus sylvatica L.

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