Abstract
The impact of different types of thinning on the genetic structures of three European beech stands in different regions in Germany was studied. The first results obtained from pairs of thinned and untreated (reference) experimental plots in each beech stand investigated make clear that the genetic structuring in the three beech stands have changed after silvicultural treatment. However, the genetic distance between the untreated stands was higher than that between the different treatments within each stand. The percentage of heterozygosity was found to be higher in the experimental plot under selective thinning than in the untreated one, while no distinct differences between moderate or intensive thinning and the respective untreated plots became evident. Spatial autocorrelation of the genetic variants was observed mainly before thinning, suggesting that members of related trees from former regeneration plots with possibly the same seed parent are removed after silvicultural treatments in beech populations.Key words Fagus sylvatica European beechsilviculturegenetic structuresisozymesspatial autocorrelation
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