An insight in tree-water-relation responses to climate from 13-years of sap flow and dendrometers daily cycles Patrick Fonti 1 , Vinicio Carraro 2 , Marco Carrer 2 , David Frank 1 , Giai Petit 2 , Tommaso Anfodillo 2 1 Swiss Federal Research Institute WSL, Zürcherstrasse 111, CH- 8903 Birmensdorf, Switzerland 2 Università di Padova - Dep. TeSAF, Forest Ecology Research Unit, 35020 Legnaro (PD) - Italy patrick.fonti@wsl.ch 1