“…Beech masting frequency, which generally varies between 3 and 10 years, has been reported to increase in many parts of Europe over the 20th century (e.g. Holmsgaard and Bang, 1990;Hilton and Packham, 1997;Schmidt, 2006;Ö vergaard et al, 2007, and references therein). This increase may be related to the higher frequency of warm periods and to the effect of higher nitrogen availability through atmospheric deposition (Falkengren-Grerup and Eriksson, 1990;Callesen et al, 2007) or direct fertilization of forest stands (Le Tacon and Oswald, 1977).…”