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Trends in basal area increments in 42 beech plants in four different age classes (Class I = 24 to 30 year old, (a); Class II = 17 to 23 year old, (b); Class III = 10 to 16 year old, (c); and Class IV = 7 to 9 year old (d). The summer drought of 2003 was used as pointer year. Non-linear regression (after post hoc testing) with power function was used to report the strength in the growth trend.
