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Maderas. Ciencia y tecnología

On-line version ISSN 0718-221X

Abstract

MONTEOLIVA, Silvia; CIGANDA, Verónica  and  IGARTUA, Dora V. Heartwood and sapwood content in Eucalyptus globulus and Acacia melanoxylon growing in Argentina. Maderas, Cienc. tecnol. [online]. 2012, vol.14, n.1, pp.53-63. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2012000100005.

The aims of the work were to determine heartwood and sapwood content in Eucalyptus globulus and Acacia melanoxylon trees, to study their variation and to establish relationships between heartwood and log volume and diameter. Ten trees of 9-years old E. globulus and ten trees of A. melanoxylon between 19 and 32 years old were sampled in Buenos Aires, Argentina. Heartwood area, volumes and percentage, and sapwood width were measured and calculated at four discs by tree (base, 1.3 m, 30% and 50% of total height). E. globulus heartwood percentage decreased significantly from the base upwards (46% at the base and 30% at the last sample height); in A. melanoxylon axial differences were not significant (48% to 31%). Sapwood width was relatively constant with sample height and its means were 26 mm for both species. Average heartwood volume represented 37 % of the log volume for E. globulus and 43 % for A. melanoxylon. For both species, linear regression models show positives relationships between heartwood volume and two variables of commercial and inventorial importance: log volume and diameter at breast height.

Keywords : Heartwood area; sapwood width; heartwood volume; regressions; axial variation.

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