Journal
ENVIRONMENTAL POLLUTION
Volume 158, Issue 8, Pages 2527-2532Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.05.009
Keywords
Ozone; Fagus sylvatica; Stem production; Soil respiration; Flux
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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. (C) 2010 Elsevier Ltd. All rights reserved.
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