Title
Enhanced ozone strongly reduces carbon sink strength of adult beech (**Fagus sylvatica**): resume from the free-air fumigation study at Kranzberg Forest Enhanced ozone strongly reduces carbon sink strength of adult beech (**Fagus sylvatica**): resume from the free-air fumigation study at Kranzberg Forest
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Biology
Source (journal)
Environmental pollution. - London
Volume/pages
158(2010) :8 , p. 2527-2532
ISSN
0269-7491
ISI
000280571500001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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 treesoil 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. Empirical proof corroborates substantial mitigation of carbon sequestration in the treesoil system of a forest site under enhanced O3 impact for adult beech.
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