Effects of Incomplete Block Design and Stand Structure on Heritability of Growth in a Jack Pine Family Test in Manitoba

1989

S. 1044-1050

1 Abb., 5 Tab., 18 Lit. Ang.

Unselbständiges Werk

200088353

Height and diameter were measured in three plantations of a Pinus banksiana Lamb. family test with stand structure in southeastern Manitoba at 10 years from planting. The plantations were established in a cubic lattice design. For height and diameter, respectively, 90.6 and 90.8% of total variance among trees was within plots, 1.7 and 2.0% was due to stands, 2.0 and 2.0% to families, 2.6 and 1.8% to family by plantation interaction, and the remaining 3.1 and 3.5% to residual plot error. All tested effects were significant for height and diameter at P < 0.05. Family, within-family, and individual tree heritabilities were 0.49 and 0.52, 0.065 and 0.065 and 0.098 for height and diameter respectively. The stands component was excluded from within-family contributions in estimating heritability. When the data were analyzed as a randomized block experiment, the variance components for plot error increased to 13.9and 11.3% of total variance, whereas the interaction component decreased to less than 1%. Heritability estimates were slightly lower than those from cubic lattice analysis. Cubic lattice design and analysis were effective in reducing plot error.