Crown status of holm oak (Quercus ilex L.) trees as related to phenology and environmental stress

TitleCrown status of holm oak (Quercus ilex L.) trees as related to phenology and environmental stress
Publication TypeJournal Article
Year of Publication1995
AuthorsBussotti, F., Ferretti M., & Cozzi A.
JournalWater, Air, & Soil …
Volume85
Pagination1269-1274
Keywordsabscission, crown condition, holm oak (voyant), leaves
Abstract

In order to study the possible interactions between air pollution and climate coaditions in Mediterranean evergream 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 Meditea-raneeaa broadleaves, so that even the role of non- acute pollution can be disguised. Xeromorph adaptations in holm oak leaves are also a mechanism providing a greater protection against poltutants.