Selection for improved growth and wood density in lodgepole pine: effects on radial patterns of wood variation.

摘要: Changes in growth and wood density traits were investigated across annual rings of 12-year-old trees from four selected subpopulations lodgepole pine ( Pinus contorta Dougl. Ex Loud var. latifolia Engelm) based on X-ray densitometry profile data. Four constructed height as follows: 1) fast high (FH); 2) slow (SH); 3) low (FL); 4) (SL). Annual ring was initially high, declined with age until 10, then plateaued. Significant differences among found for density, earlywood latewood densities, width, proportion, width after 6. Wood decreased less the pith to bark both overall densities FH subpopulation, resulting denser, more homogeneous than other subpopulations. This suggests that it may be possible increase homogeneity juvenile this species by selecting families. Overall better improved components separately. The earliest which families combining can accurately identified is about 7 years.