HR: 08:45h
AN: A21A-04    [PDF]
TI: Effects of high ambient temperature on plant physiology and the emission of monoterpenes, isoprene, and volatile organic carbon by beech observed during ECHO-field campaigns in 2002 and 2003
AU: * Dindorf, T
EM: dindorf@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Kuhn, U
EM: kuhn@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Dindorf, W
EM: dindorf@mail.uni-mainz.de
AF: Johannes Gutenberg University, Department of Organic Chemistry, Duesbergweg 10-14, Mainz, 55099 Germany
AU: Ammann, C
EM: Christof.Ammann@fal.admin.ch
AF: Swiss Federal Research Station for Agroecology and Agriculture, Reckenholzstr. 191, Zurich, 8046 Switzerland
AU: Chaparro, G
EM: gchaparro@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Knothe, N
EM: knothe@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Steindel, F
EM: steif007@students.uni-mainz.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Tritsch, C
EM: ChT76@gmx.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Scheibe, M
EM: mail@monika-scheibe.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AU: Brancaleoni, E
EM: enzo.brancaleoni@imc.cnr.it
AF: Istituto di Metodologie Chimiche, Area della Ricerca del CNR di Montelibretti, Via Salaria km 29.300, Monterotondo Scalo, 00019 Italy
AU: Frattoni, M
EM: massimiliano.frattoni@imc.cnr.it
AF: Istituto di Metodologie Chimiche, Area della Ricerca del CNR di Montelibretti, Via Salaria km 29.300, Monterotondo Scalo, 00019 Italy
AU: Ciccioli, P
EM: paolo.ciccioli@imc.cnr.it
AF: Istituto di Metodologie Chimiche, Area della Ricerca del CNR di Montelibretti, Via Salaria km 29.300, Monterotondo Scalo, 00019 Italy
AU: Kesselmeier, J
EM: jks@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Department of Biogeochemistry, P.O. Box 3060, Mainz, 55128 Germany
AB: The emission of volatile organic compounds (VOC) from 40-80 year old beech trees (Fagus sylvatica) was studied during two intensive field campaigns in the summers of 2002 and 2003 within the framewok of the ECHO (Emission and CHemical Transformation of volatile biogenic Organic compounds) project. Determination of VOC emission rates was performed by various conventional techniques (GC-FID, GC-MS, HPLC), but also by online analysis of total volatile organic carbon. High ambient temperatures (30-40$\deg$C), as observed during both campaigns, were found to have a significant impact on plant physiology (assimilation, transpiration, and stomatal conductance), indicating a reversible stress condition, expressed in a diurnal reduction of CO2 uptake and water loss (midday depression). In parallel with this effect, the emission of volatile organics increased by two orders of magnitude, but also showed a hysteresis effect that followed the drop in net assimilation in the afternoon.
DE: 0315 Biosphere/atmosphere interactions
DE: 0394 Instruments and techniques
DE: 0400 Biogeosciences
DE: 1610 Atmosphere (0315, 0325)
DE: 1615 Biogeochemical processes (4805)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting