Variabilidade das densidades básica e energética e estoque de carbono na madeira no fuste de clones de Eucalyptus

Abstract

There are few publications evaluating wood variation properties along the stem of many Eucalyptus clones. Thus, the aim of this research was to evaluate the longitudinal variation of the basic density, wood carbon stock, and energy density of clones in the genus Eucalyptus. 39 Eucalyptus sp. clones were evaluated at 81 months of age; with 3 trees sampled according to genetic material, and samples from 5 longitudinal positions along the stem collected at 2%, 10%, 30%, 50%, and 75% of the commercial height. The characteristics evaluated in these positions were basic density; carbon stock and wood energy density. The experiment was conducted in a completely randomized design (CRD), arranged in split plot design. There is dependence between clone and longitudinal position for basic density, carbon stock, and energy density. Four variation patterns of basic density were found for the Eucalyptus urophylla clones. There was a strong correlation of the basic density with carbon stock (r=0.9893) and wood energy density (r=0.9798). Wood basic density presented patterns of medium and high variability between genetic materials and longitudinal positions along the stem, respectively. Clones 1001, 1009, 1025, and 1039 were the most suitable for bioenergy purposes due the high values of basic density, carbon stock, and wood energy density.