The influence of microclimate and tree age on the defense capacity of European beech (Fagus sylvatica L.) against oxidative stress Gerhard Wieser, Karin Hecke, Michael Tausz, Karl-Heinz Häberle, Thorsten E.E. Grams and Rainer Matyssek Ann. For. Sci., 60 2 (2003) 131-135 DOI: 10.1051/forest:2003005