RADIATA PINE pH AND BUFFERING CAPACITY: EFFECT OF AGE AND LOCATION IN THE STEM

Vicente Hernández

Abstract


In this work the effect of age and location within the stem on pH and buffering capacity of radiatapine sapwood was investigated. Mature and juvenile wood samples from three different heights inthe trunk were obtained from 20, 25, and 30 year-old trees. Aqueous wood extracts from the sampleswere used to determine the pH and buffering capacity of wood. Results show a significant effect of ageand location in the tree, although a strong interaction among all factors was also detected. In generalsapwood tended to be more acidic in the lower part of trees, but juvenile wood showed to be moreacidic than mature wood. From both type of wood tested, juvenile wood was more sensitive to changeits pH and buffering capacity with the height and age. The effect of wood pH and buffering capacity inthe manufacture of wood composites is discussed and further research is recommended to determinewhether the variations detected in this study can affect the curing of resins and quality of wood basecomposite manufactured with radiata pine wood.

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