Age-age correlations in, and relationships between basic density and growth in Eucalyptus nitens
Greaves, BL, Borralho, NMG, Raymond, CA, Evans, R & Whiteman, PH 1997, 'Age-age correlations in, and relationships between basic density and growth in Eucalyptus nitens', Silvae Genetica, vol. 46, pp. 464-270.
Pith to bark density was measured on cores cut from 588 7-year-old Eucalyptus nitens trees. Heritability of ring density averaged 0.37 and was consistently higher than the heritability of earlywood or latewood density. Earlywood, latewood, and ring densities were highly genetically correlated. Age-age correlations for ring density declined with increasing age difference, and were moderately described by LAMBETH’s (1980) relationship with log of age ratio. Disk and core densities were calculated as weighted averages of ring densities. Age-age correlations for disks and cores were higher and better described by LAMBETH’s relationship than ring density correlations. Age-age correlations for growth assessed at 20 months, 4 years and 7 years were not well described by LAMBETH’s relationship. Height, diameter, and volume were well correlated at age 7 years (rg> 0.9), as were disk density, core density, outer-ring density and Pilodyn penetration (rg> 0.9). Density showed a weak negative genetic relationship with diameter at age 7 years (rg = –0.2).