JUVENILE TO MATURE WOOD TRANSITION IN ONE CLONE OF Populus deltoides IMPLANTED IN BUENOS AIRES, ARGENTINE

Ana C. Cobas, María C. Area Area, Silvia Monteoliva

Abstract


The aim of this work was to determine the age at which the transition of the juvenile wood to themature wood takes place, by means of the parameters: density, morphometry of fibers, and vessels inone poplar clone. Five 17-year-old Populus deltoides “Australia 129-60” trees were sampled from acommercial plantation in Buenos Aires, Argentina. Samples were taken at 5 heights from the trunk: 0.3m, 1.3 m, 4.2 m, 8.1 m and 15.9 m and the annual radial growth, wood density, morphometry of fibersand vessels, and cell wall area were measured. Segmented regression analyses were used to determinethe age of transition from juvenile to mature wood. The radial variation of different anatomical propertiesincreased with age. The estimated age of transition from juvenile wood and mature wood was not identicalfor all properties. The transition ages were 4, 5, 7 and 9 years depending on the variable. The sequenceof maturation was: cell wall area, vessel diameter and frequency, fiber width and length, density andwall thickness. Juvenile wood properties were significantly lower with respect to the mature wood. Thevolume of the juvenile wood was 52%.

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