... possible inde-pendently of whether the variation is caused by wood densityor other underlying traits. Differences were found among fam-ilies within a natural stand of Norway spruce, indicating thatthere ... stiffness, strength,internal checking, and resin bleeding for radiata pine, Can. J. For.Res. 34 (200 4) 2601–2610.Ann. For. Sci. 64 (200 7) 799–806 Available online at:c INRA, EDP Sciences, ... existing genetic variation to achieve geneticgain. However, the knowledge regarding genetic variationwithin natural stands of Norway spruce is very limited for traits affecting wood quality. In...