Fig. 6From: On the knowns and unknowns of natural regeneration of silviculturally managed sessile oak (Quercus petraea (Matt.) Liebl.) forests—a literature reviewAverage differences in height increment between sessile oak and European beech across varying relative light levels. The first data point series (solid line) depicts modelled height increment values of planted 4- to 6-year-old seedlings growing in a forest stand located close to Göttingen, Lower Saxony, Germany (von Lüpke and Hauskeller-Bullerjahn 2004). The second data point series (dashed line) depicts height increment of circa 1.5 m tall, naturally regenerated seedlings as predicted by height growth models developed from data collected in numerous forest stands of the Belgian Ardennes (Ligot et al. 2013)Back to article page