期刊
ENVIRONMENTAL POLLUTION
卷 157, 期 5, 页码 1427-1437出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.09.034
关键词
Basal area increment; Crown transparency; Critical levels; Forest monitoring; Visible leaf injuries
The impact of ozone on forest ecosystems in Italy is monitored within the CONECOFOR programme. Ozone levels are measured in 30 plots using passive samplers. Response parameters used are: crown condition (transparency), BAI (basal area increment), and visible symptoms on spontaneous vegetation. Levels of AOT40 are above the concentration-based critical level of 5 ppmh in all sites, but the evidence of impact on forest vegetation remains limited. Ozone is a predictor of crown transparency residuals in beech sites over two consecutive years, but the variance explained amounts to less than 10%. The relation between BAI reduction and ozone is even less certain. Transparency and BAI are more readily explainable in terms of ecological conditions of the site and climate fluctuations. The interpretation of visible symptoms is doubtful, and is conditioned by the prevailing ecological factors in the areas. (C) 2008 Elsevier Ltd. All rights reserved.
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