Crown status of holm oak (Quercus ilex L.) trees as related to phenology and environmental stress |
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| Authors: | F. Bussotti M. Ferretti A. Cozzi P. Grossoni A. Bottacci C. Tani |
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| Affiliation: | 1. Dept. of Plant Biology, Laboratory of Forest Botany, Piazzale delle Cascine 28, I-50144, Firenze, Italy
2. Linnaea Ambiente, Via G. Sirtori 37, I-50137, Firenze, Italy
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| Abstract: | In order to study the possible interactions between air pollution and climate conditions in Mediterranean evergreen broadleaf species, since 1987 we have been monitoring the annual and infra-annual variations in crown density of Quercus ilex L. (holm oak) in a permanent sample plot. The behaviour of crown density has been compared with litterfall pattern and aging processes in leaves. The results of this study confirm the important impact of climate on crown condition in Mediterranean broadleaves, so that even the role of nonacute pollution can be disguised. Xeromorph adaptations in holm oak leaves are also a mechanism providing a greater protection against pollutants. |
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