Resumen

VASQUEZ CORREA, Ángela María  y  ALCANTARA VARA, Esteban. DENSITY AND WOOD ANATOMY OF ROMERON PINE [Retrophyllum rospigliosii (Pilger) C.N. Page] TREES EIGHT YEARS OLD. Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.1, pp.4869-4880. ISSN 0304-2847.

Variation of density and dimensions of tracheids in wood of pine romeron from two provenances of eight year-old and three diameter classes were studied. In transverse sections of six trees per provenance, in the base, height breast (HB) and 25, 50 and 75% of total height, diametrical sections were took to determine the density in the first half, in subsamples, to 25, 50, 75 and 100% of radial length. In the second half were selected early and late woods in the pair growth rings to measure tracheid dimensions. The results showed: (a) radial decrease of density from the 25% of the radio toward bark. Higher density at the base, decline until the breast high (AP), intermediate values of 50 %, and decreased to final 75%; (b) average density with no significant differences between provenances Jericó (0.37 g/cm3) and Mesitas del Colegio (0.36 g•cm-3), (c) radial increment of tracheids dimensions, significant difference between the provenances only for the length, higher values in late wood and final axial increment to 75%, (d) formation of two wooden types, one from pith until the eighth growth ring, associated with juvenile or internal juvenile wood, and another near the bark, associated with transition wood toward the mature or external juvenile wood, (e) analysis of the variation of characteristics, showed no marked difference among provenances.

Palabras clave : Basic density; pine romeron; tracheids; radial and axial variation.

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