Abstract

LETOURNEAU, F.J et al. Caracterización xilo-tecnológica de la madera de una plantación adulta de Pinus ponderosa de la patagonia Argentina. RIA. Rev. investig. agropecu. [online]. 2014, vol.40, n.2, pp.196-201. ISSN 1669-2314.

Knowledge of the properties of the wood is essential to their best use. Juvenile and mature wood differ in their fitness for use, the first can be used as round timber, limited structural scantlings while the mature large can be used in joinery, quality facing or other more valuable uses. It is therefore important to establish the time of transition between the two as well as other properties of wood resistance of this species at older ages. For this, we studied a) tracheid length to differentiate juvenile / mature wood b) Basic density, and c) mechanical strength properties of samples from bottom logs. The study was conducted in a plantation of 55 years, in 12 trees of 43cm dbh and height 27m. Tracheids samples and basic density were taken at 0.3 m and 13.4 m at the base of the crown, radially from the core, the first sample to five years and then every ten years. The results were: a) The transition of wood at 0.3 m occurred about 20 years, b) the average basic density at 0.3m was 0.42 g/cm³ (n = 66), and at the base of the crown was 0.36 g/cm³ (n = 37). We observed a pattern of variation of the basic density radially, which may indicate an incipient duraminization at stump height c) bending tests established that the MOE of 8.000MPa, while MOR was 72MPa.

Keywords : Ponderosa Pine; Wood technology; Tree plantations.

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