Free access
Ann. For. Sci.
Volume 51, Number 1, 1994
Page(s) 1 - 10
Ann. For. Sci. 51 (1994) 1-10
DOI: 10.1051/forest:19940101

Preliminary dendroecological survey on pedunculate oak (Quercus robur L) stands in Tuscany (Italy)

A Santini, A Bottacci and R Gellini

Laboratorio di Botanica Forestale, Dipartimento di Biologia vegetale, Università di Firenze, Piazzale delle Cascine, 28, 50144 Firenze, Italy

Abstract - This paper studies the influence of climate on pedunculate oak radial growth in some stands of central Mediterranean Italy. Three populations growing along the course of the River Arno were selected. Core samples were measured, and their growth curves standardized and modellized, in order to isolate the climate signal. The response functions were calculated by orthogonal regression of the variables of the tree ring (dependent variables) and the climate (explicative variables). This paper provides an eco-physiological analysis of the results This study helps us understand how the ecotype of the pedunculate oak has adapted to a Mediterranean climate where water supply is a strong limiting factor.

Résumé - Observations dendroécologiques préliminaires sur des peuplements de chênes pédonculés en Toscane (Italie). Le travail concerne l'étude de l'influence du climat sur la croissance radiale du chêne pédonculé dans l'Italie centrale. On a choisi et échantillonné 3 peuplements le long de l'Arno. Les échantillons ont été mesurés et les courbes d'accroissement ont été standardisées et modélisées dans le but d'isoler le signal climatique. Les fonctions de réponse ont été calculées par régression orthogonalisée entre la variable cerne (variable dépendante) et les variables climatiques (variable explicative). Les résultats sont discutés du point de vue écophysiologique. Cette étude aide à comprendre comment des écotypes de chêne pédonculé se sont adaptés au climat méditerranéen où la disponibilité de l'eau est le facteur limitant le plus important.

Key words: dendroecology / pedunculate oak / water supply / Mediterranean forest / eco-physiology

Mots clés : dendroécologie / chêne pédonculé / sécheresse / forêt méditerranéenne / écophysiologie

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