The elasticity of growth in pure and mixed stands of Norway spruce (Picea abies Karst.) and common beech (Fagus sylvatica L.)
Journal of Forest Science 49(11): 491-501
ISSN/ISBN: 1212-4834 Accession: 004352713
A study was conducted to determine the growth reaction pattern of pure and mixed stand of Norway spruce (Picea abies) and common beech (Fagus sylvatica) below or above medium stand density. The investigation was based on 42 long term experimental areas with 134 plots in the pure and mixed stands in Central and South Germany (Bavaria, Saarland, Lower Saxony, North Rhine-Westphalia). The oldest of these trials are maintained and measured since 1870 regularly. In most periods, an optimum relationship between density and growth was apparent. The periodic annual increment increases from C grade (heavy thinning) to the B grade (moderate thinning) and then decreases in the transition to grade A (light thinning).