Ca Si R Oz

ground level O3 regimes. This includes mechanistic
knowledge regarding threshold definitions of O3 flux
(uptake) rather than exposure. The most important
relevance of the elaborated results will be for the
UNECE “Level II and III” concepts about “Critical Levels
for Ozone” and the UNECE “ICP-Forests” program.
In particular, impacts on practical development
strategies will be (1) evaluation tools to assess modifications of the CO 2 sink strength of forests due to
additional impacts, in the present case ozone (cf.
Kyoto protocols) and (2) quantification of factors
modifying the O3 effect on adult beech forest trees,
which is necessary for the “Level II” approach of the
critical level concept (UNECE). These outcomes can
be applied to planning tasks or to monitoring of
environmental changes. The target groups for these
results are public and private authorities responsible
for forest management, regional development, and
policy making.
Project Structure
GENERAL PUBLIC
ENVIRONMENTAL POLICIES
DECISION MAKING
SCALING
TREE ==============
STAND
(arrows indicate
conceptual interactions)
MODELING
CLIMATOLOGY
ECOPHYSIOLOGY
Ceulemans
Fabian
Biochemistry &
Molecular Biology
Ecophysiology
& Modeling Matyssek
Oßwald
MYCORRHIZAE
Kraigher
BIOCHEMISTRY
MOL. BIOLOGY
Wieser
Tausz
Rennenberg
Hanke
Sandermann
PARTICIPANTS AS AGGREGATED BY
SUB-PROJECTS (CIRCLES) AND WORKPACKAGES (SQUARES)
Literature:
Nunn et. al. (2002) "Free Air" Ozone Canopy Fumigation in an
Old-Growth Mixed Forest: Concept and Observations
in Beech. Phyton 42:105 - 119.
Werner & Fabian (2002) "Free-air fumigation of mature trees: A
novel system for controlled ozone enrichment in
grown-up beech and spruce canopies."
Environmental Science and Pollution Research
International 9: 117-121.
Cooperating Partners
Prof. Dr. R. Matyssek (coordinator)
Ecophysiology of Plants, Department of Ecology, Technische Universität
München Life Science Center Weihenstephan Am Hochanger 13, 85354
Freising, Germany. Phone: +49-8161-714574; Fax +49-8161-714576;
E-mail: matyssek@wzw.tum.de
Prof. Dr. W. Oßwald
Forest Phytopathology, Department of Ecology, Technische Universität
München Life Science Center Weihenstephan Am Hochanger 13, 85354
Freising, Germany. Phone: +49-8161-714577; Fax +49-8161-714576;
E-mail: osswald@wzw.tum.de
Prof. Dr. R. Ceulemans
Research Group of Plant and Vegetation Ecology, Department of Biology
University of Antwerpen (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium.
Phone: +32-3-820-2256. Fax: +32-3-820-227;
E-mail: reinhart.ceulemans@ua.ac.be
Prof. Dr. H. Rennenberg
Inst. Für Forstbotanik und Baumphysiologie, Albert-Ludwigs Universität
Freiburg i. Br., Georges-Köhler-Allee, D-79085 Freiburg, Germany.
Phone: +49-761-2038300;
E-mail: here@uni-freiburg.de
The Carbon Sink Strength of Beech in a Changing
Environment: Experimental Risk Assessment
of Mitigation by Chronic Ozone Impact.
EC Project within
Fifth RTD Framework Programme
Ecosystem Vulnerability
Commission of the European Union
Contract No. EVK2-2002-00165
http://www.casiroz.de/
Prof. Dr. D. Hanke
Dept. of Plant Sciences, University of Cambridge, Downing Street,
Cambridge CB2 3EA, UK. Phone +44-1223-333900;
E-mail: deh1000@hermes.cam.ac.uk
PD Dr. Kraigher
Department for Forest Physiology and Genetics Programme group
Forest Biology, Ecology and Technology Slovenian Forestry Institute,
Vecna pot 2, 1000 Ljubljana, Slovenia.
E-mail: hojka.kraigher@gozdis.si
PD Dr. G. Wieser
Abt. Forstpflanzenphysiologie, Bundesamt und Forschungszentrum für
Wald, Rennweg 1, A-6020 Innsbruck, Austria. Phone +43-25739335120;
E-mail: gerhard.wieser@uibk.ac.at
PD Dr. M. Tausz & Prof. Dr. D. Grill
Institute of plant physiology, University of Graz Schubertstraße 51,
A-8010 Graz, Austria. Phone +43-3163805632;
E-mail: michael.tausz@uni-graz.at
Prof. Dr. P. Fabian
Bioclimatoloy and Air Pollution Research Department of Ecology
Technische Universität München, Life Science Center Weihenstephan Am
Hochanger 13, 85354 Freising, Germany. Phone: +49-8161-714740;
Email: fabian@met.forst.tu-muenchen.de
Prof. Dr. H. Sandermann
Institute for Biochemical Plant Pathology GSF - Forschungszentrum für
Umwelt und Gesundheit Postfach 1129, 85764 Oberschleißheim,
Germany. Phone: +49-89-3187-2285;
Email: sandermann@gsf.de
For further information please contact:
Prof. Dr. R. Matyssek
Ecophysiology of Plants, Department of Ecology,
Technische Universität München
Life Science Center Weihenstephan
Am Hochanger 13, 85354 Freising, Germany
Phone: +49-8161-714574; E-mail: matyssek@wzw.tum.de
Scope of research
Evidence will be incorporated into mechanistic
modeling for scaling to the stand level and quantifying
O3 impact for “Global Change” scenarios. This process-oriented risk assessment will guide environmental
policy making.
'FREE-AIR CANOPY O3 EXPOSURE'
of adult trees in a beech stand
!
!
RATIONALE
CONTROL
TREATMENT
!
providing a database for “Level II” analyses of O3
impact in the field
to provide a scientific, biologically meaningful
basis for environmental policy-making with
respect to the chronic exposure of trees to ozone
and the implications of carbon fixation by woody
plants in a changing atmosphere (“ Global
Change”)
to examine the extent to which the physiological
modifications observed in adult trees may be
consistent with the existing information from
young-tree O3 exposures
to derive metabolic indications from whole-tree
response patterns (at the cell, organ and wholeplant level) that might allow to distinguish injurious
versus acclimatory O3 effects
after Nunn et al. 2002
The project aims at clarifying the vulnerability of adult
beech trees, growing under Central-European stand
conditions, to the tropospheric, chronic ozone (O3)
impact. O3 as being part of “Global Change” may
constrain the carbon sink strength of trees under the
expected atmospheric CO2 enrichment. A novel
“Free-Air Canopy O3 Exposure” system is employed for
analyzing O3-induced responses that are relevant for
the carbon balance and CO2 demand of the trees.
An experimentally enhanced O3 regime (relative to
“control” trees in unchanged air) is created within the
canopy of the Kranzberg Forest research site. By this it
Kranzberg Forest research site (view from
research crane): mixed beech / spruce
stand at 48°25’08”N, 11°39’41”E, 485m
a.s.l.; trees about 60 years old, up to 30 m high. Experimental free-air
canopy O3 exposure within white frame (after Nunn et al. 2002).
is possible to relate tree performance to effective O3
doses rather than O3 exposure. The O3 flux concept
into leaves will be examined and validated against
AOT40 (accumulated dose over a treshold of 40
ppb). Response patterns will be assessed, integrating
the cell, organ and whole-tree level, while making use
of molecular, biochemical and ecophysiological
methodologies. In addition, branch cuvette fumigations and exposure of young beech plants inside the
stand canopy will validate the ecological significance of former O3 studies in phytotrons, open-top
chambers or on single branches in tree crowns.
The major aims of the CASIROZ project are
! to create the mechanistic basis for the quantitative
!
!
!
!
risk assessment of the performance of adult trees
and forest stands of Fagus sylvatica
to validate the existing “Critical Level” definition for
ozone (AOT40) and to further develop O 3 flux
concepts, linking risk assessment to actual O 3
uptake
to assess the carbon sink strength of beech under
chronic O3 exposure and actual, rural site conditions, including the role of below-ground processes
to quantify differential O 3 effects as occurring
during daylight versus dark hours, and between sun
and shade crown
to model chronic O3 effects on beech at the tree
and stand level in a mechanistic way, by this,
Free-Air Canopy Ozone Exposure FACOE scheme. Werner &
Fabian 2002
Envisaged outcome
The major outcome of this study will be the elaboration of a database needed for the management of
trees and stands under the chronic, enhanced