title: Enhanced ozone strongly reduces carbon sink strength of adult beech (Fagus sylvatica)--resume from the free-air fumigation study at Kranzberg Forest.
abstract: Ground-level ozone (O(3)) has gained awareness as an agent of climate change. In this respect, key results are comprehended from a unique 8-year free-air O(3)-fumigation experiment, conducted on adult beech (Fagus sylvatica) at Kranzberg Forest (Germany). A novel canopy O(3) exposure methodology was employed that allowed whole-tree assessment in situ under twice-ambient O(3) levels. Elevated O(3) 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 O(3) 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 O(3) can substantially mitigate the C sequestration of forests in view of climate change.
authors.affiliation: Ecophysiology of Plants, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, D-85354 Freising, Germany. matyssek@wzw.tum.de
authors.forename: R
authors.initials: R
authors.lastname: Matyssek
authors.forename: G
authors.initials: G
authors.lastname: Wieser
authors.forename: R
authors.initials: R
authors.lastname: Ceulemans
authors.forename: H
authors.initials: H
authors.lastname: Rennenberg
authors.forename: H
authors.initials: H
authors.lastname: Pretzsch
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authors.initials: K
authors.lastname: Haberer
authors.forename: M
authors.initials: M
authors.lastname: Löw
authors.forename: A J
authors.initials: AJ
authors.lastname: Nunn
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authors.initials: H
authors.lastname: Werner
authors.forename: P
authors.initials: P
authors.lastname: Wipfler
authors.forename: W
authors.initials: W
authors.lastname: Osswald
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authors.initials: P
authors.lastname: Nikolova
authors.forename: D E
authors.initials: DE
authors.lastname: Hanke
authors.forename: H
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authors.lastname: Kraigher
authors.forename: M
authors.initials: M
authors.lastname: Tausz
authors.forename: G
authors.initials: G
authors.lastname: Bahnweg
authors.forename: M
authors.initials: M
authors.lastname: Kitao
authors.forename: J
authors.initials: J
authors.lastname: Dieler
authors.forename: H
authors.initials: H
authors.lastname: Sandermann
authors.forename: K
authors.initials: K
authors.lastname: Herbinger
authors.forename: T
authors.initials: T
authors.lastname: Grebenc
authors.forename: M
authors.initials: M
authors.lastname: Blumenröther
authors.forename: G
authors.initials: G
authors.lastname: Deckmyn
authors.forename: T E E
authors.initials: TE
authors.lastname: Grams
authors.forename: C
authors.initials: C
authors.lastname: Heerdt
authors.forename: M
authors.initials: M
authors.lastname: Leuchner
authors.forename: P
authors.initials: P
authors.lastname: Fabian
authors.forename: K-H
authors.initials: KH
authors.lastname: Häberle
mesh_terms: D000393:Air Pollutants / Q000378:metabolism / Q000633:toxicity*; D002244:Carbon / Q000378:metabolism*; D029964:Fagus / Q000378:metabolism*; D005858:Germany; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects; D014197:Trees / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D010126:Ozone; D002244:Carbon