Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands Moreno Vertovec, Serdal Sakçali, Munir Ozturk, Sebastiano Salleo, Paola Giacomich, Enrico Feoli and Andrea Nardini Ann. For. Sci., 58 2 (2001) 113-125 DOI: 10.1051/forest:2001111