Variation in Eucalyptus sp. wood properties with tree height.
Cross sections were sampled at 2-m intervals from stems of 10-yr old eucalyptus trees - Eucalyptus bicostata, E. dalrympleana, E. gunnii, E. × trabutii, E. viminalis growing near Rome, central Italy, and E. camaldulensis, E. globulus, E. gomphocephala, E. grandis, E. occidentalis growing near Catanzaro, Calabria, S. Italy - and percentage bark, wood moisture content, wood density, volumetric shrinkage and collapse, percentage heartwood, fibre size and chemical composition were evaluated. All traits showed some variation in relation to position along the tree stem. Wood basic density showed a gradual increase with height, and a consequent reduction in extent of collapse. Percentage heartwood also varied notably between upper and lower stem; traits with little variation were fibre size and wood chemical composition.