Ocena polskich ras dębu szypułkowego (Quercus robur L.) i bezszypułkowego (Q. petraea [Matt.] Liebl.) testowanych w doświadczeniu proweniencyjnym w Kórniku

The growth rate and developmental traits of oak provenances were studied in spring 2001. The studies showed significant differences between provenances with regard to survival, tree height, dbh, basal area, volume, stem straightness, branch angle, epicormic shoot formation and foliage losses. There were no inter−population differences for stem forks, grade of natural stem pruning and bio−social position of trees in a stand. Provenances: Kórnik, Białowieża and Dębina exhibited the best height growth. Trees from the Białowieża provenance had the straightest stems with a few epicormic shoots. The performance of sessile oaks under the site conditions of the experiment was much poorer than of penduculate oaks. No geographical patterns were found for growth performance and developmental traits. The obtained results indicate the possibility to select provenances of fast−growing trees with economically advantageous traits.