Determination of the transition age from juvenile to mature wood in Pinus patula SCHL. et CHAM
DOI:
https://doi.org/10.35197/rx.01.02.2005.05.DMKeywords:
wood quality, wood density, wood formation, tracheid lenght, radial trend, latewood proportion, piecewise regressionAbstract
In order to compare different criteria for estimating the age of transition in the formation of juvenile to mature wood in a 16-year-old Pinus patula plantation, the radial pattern of the proportion of latewood, wood density and tracheid length was identified in a sample of 100 trees. A wood sample was obtained from each tree with an increment drill at 50 cm of the trunk height. The proportion of latewood showed a gradual increase until 14 years of age and then a faster increase was observed; wood density showed a decrease in the first years and subsequently showed a gradual increase, stabilizing at 12-14 years of age. Tracheid length showed a more stable pattern, increasing progressively from the center until stabilizing at 8-10 years of age. A segmented regression analysis using the average annual values of tracheid length and wood density showed that the age of transition from juvenile to mature wood occurred at 10 years in this plantation. The criterion based on tracheid length was more useful, as it showed a more evident change in slope. Based on this criterion, a wide variation was found between trees in the transition age (from 6 to 16 years), which could be associated with genetic effects; however, a larger sample size is required to estimate the genetic variation in this characteristic.
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Copyright (c) 2005 David Josué Meza Juárez, J. Jesús Vargas Hernández, Javier López Upton, Humberto Vaquera Huerta, Amparo Borja de la Rosa
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