Vyhodnocení provenienční plochy IUFRO s jedlí obrovskou na lokalitě Drahenice ve středních Čechách ve věku 41 let

The paper deals with growth and prosperity of 25 provenances of grand fir from Washington, Oregon, Idaho and Montana (USA), and from Vancouver (British Columbia, Canada) tested in the international provenance research trial No. 212 – Drahenice (Czech Republic; N49° 31‘ 10‘‘, E13° 57‘ 20‘‘, 570 m a.s.l., acidic beech site). Biometric measurements took place at the age of 41 years; qualitative features were visually assessed according to the IUFRO methodology. The best overall assessment of both production and quality shows provenance 12041 – Oyster Bay (BC). Other provenances with high growing stocks, i.e. 12005 – Bear Mountain (WA), 12038 – Clearwater (ID), 12043 – Sproat Lake (BC) and 12044 – Kaye Road (BC) showed some qualitative shortcomings (lower vitality, worse stem shape or thicker branches). The worst both in production and quality were provenances 12020 – Crescent Creek (OR) and 12011 – Clear Lake (WA). The results confirm the suitability of the current setting of the rules for the transfer of reproductive material from North America to the Czech Republic.