Journal
ENVIRONMENTAL POLLUTION
Volume 192, Issue -, Pages 129-138Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.05.016
Keywords
Ozone flux; Fagus sylvatica; Picea abies; Growth reduction; Critical level
Categories
Funding
- Federal Office for the Environment (FOEN)
- Air Pollution Control and Chemicals Division
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The estimate of growth losses by ozone exposure of forest trees is a significant part in current C sequestration calculations and will also be important in future modeling. It is therefore important to know if the relationship between ozone flux and growth reduction of young trees, used to derive a Critical Level for ozone, is also valid for mature trees. Epidemiological analysis of stem increment data from Fagus sylvatica L and Picea abies Karst. observed in Swiss forest plots was used to test this hypothesis. The results confirm the validity of the flux-response relationship at least for beech and therefore enable estimating forest growth losses by ozone on a country-wide scale. For Switzerland, these estimates amount to 19.5% growth reduction for deciduous forests, 6.6% for coniferous forests and 11.0% for all forested areas based on annual ozone stomatal uptake during the time period 1991-2011. (C) 2014 Elsevier Ltd. All rights reserved.
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