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Enhanced ozone strongly reduces carbon sink strength of adult beech (Fagus sylvatica) - Resume from the free-air fumigation study at Kranzberg Forest |
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| Authors: | R. Matyssek,G. Wieser,H. Rennenberg,K. Haberer,A.J. Nunn,P. Wipfler,P. Nikolova,H. Kraigher,G. Bahnweg,J. Dieler,K. Herbinger,M. Blumenrö ther,T.E.E. Grams,M. Leuchner,K.-H. Hä berle |
| Affiliation: | a Ecophysiology of Plants, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, D-85354 Freising, Germany b Dept. Alpine Timberline Ecophysiology, Federal Office and Research Centre for Forests, Rennweg 1, A-6020 Innsbruck, Austria c Dept. of Biology, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium d Tree Physiology, Institute of Forest Botany and Tree Physiology, University of Freiburg, Georges-Koehler-Allee 53, D-79110 Freiburg, Germany e Ecoclimatology (formerly: Bioclimatology and Air Pollution Research), Hans-Carl-von-Carlowitz-Platz 2, D-85354 Freising, Germany f Forest Growth and Yield Sciences, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, D-85354 Freising, Germany g Phytopathology of Woody Plants, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, D-85354 Freising, Germany h Dept. Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK i Slovenian Forestry Institute, Forest Biology, Ecology and Technology, Vecna pot 2, 1000 Ljubljana, Slovenia j Dept. of Forest and Ecosystem Science, Melbourne School of Land and Environment, Water Street, Creswick Vic 3363, Australia k Helmholtz Zentrum München für Umwelt und Gesundheit, Institute of Biochemical Plant Pathology, Ingolstädter Landstraße 1, D-85764 Neuherberg, Germany l Hokkaido Research Center, Forestry and Forest Products Research Institute, Sapporo 062, Japan m Institute for Plant Sciences, University of Graz, Schubertstr. 51, A-8010 Graz, Austria |
| Abstract: | Ground-level ozone (O3) has gained awareness as an agent of climate change. In this respect, key results are comprehended from a unique 8-year free-air O3-fumigation experiment, conducted on adult beech (Fagus sylvatica) at Kranzberg Forest (Germany). A novel canopy O3 exposure methodology was employed that allowed whole-tree assessment in situ under twice-ambient O3 levels. Elevated O3 significantly weakened the C sink strength of the tree-soil system as evidenced by lowered photosynthesis and 44% reduction in whole-stem growth, but increased soil respiration. Associated effects in leaves and roots at the gene, cell and organ level varied from year to year, with drought being a crucial determinant of O3 responsiveness. Regarding adult individuals of a late-successional tree species, empirical proof is provided first time in relation to recent modelling predictions that enhanced ground-level O3 can substantially mitigate the C sequestration of forests in view of climate change. |
| Keywords: | Ozone Fagus sylvatica Stem production Soil respiration Flux |
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