Morphological Variability of Oak Stands (Quercus petraea and Quercus robur) in Nothern Germany : Genetics of Oaks. IUFRO Proceedings

1993

15 Lit. Ang.

Unselbständiges Werk

2819

200041664

According to the German law concerning forest reproductive material, purity of species is required for the admission of Quercus robur and Quercus petraea as seed crop stands. A method for species identification was devised by the Lower Saxony Research Institute. It is based on leaf morphology and calculates a discriminant score for every leaf by the means of discriminant analysis in comparison with 2 pure reference stands. In this way, the species relationship and the degree of expression of characters are assessed. Leaf samples were collected in 733 oak stand in Lower Saxony and evaluated for every stand. Mixed stands and stands with a high degree of intermediate forms, which may have arisen from hybridization, occur besides stands of pure species.