Relationships Between Intra-Ring Variables in Mature Douglas-Fir Trees From Provenance Plantations
Keywords:
Douglas-fir, juvenile wood, mature wood, ring density correlationsAbstract
Relationships among a variety of densitometric characteristics of juvenile and mature wood from 360 trees growing in two plantations of a 1912 Douglas-fir [Pseudotsuga menziesii (Mirb) Franco] Heredity Study were examined. Variables included earlywood density (EWD) and width (EWW); latewood density (LWD), width (LWW), and proportion (LWP); average ring density (RD); and total ring width (RW). The RD components (EWD and LWD) had strong phenotypic and genetic correlations with their respective RW components (EWW and LWW). However, no phenotypic correlation existed between average RD and total RW, and genotypic correlation was weak. The relationship between wood density and radial growth varied by plantation and genotype. The potential exists for improving wood density in juvenile and mature wood by selection, with only a minor impact on radial growth. Selection during the juvenile period to improve mature wood quality is feasible for RD, EWD, LWW, and LWP. Further, selection to improve juvenile RW does not result in reduced wood dens ty during maturity.References
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