Influence of Tree Age on the Chemical Composition of Radiata Pine
نویسنده
چکیده
The distribution of extractives, lignin, and carbohydrates in radiata pine and their variation with tree age are reviewed. Extractives, their nature, and amount depend on the heartwood content of the tree, and thus upon wood age. Lignin decreases in the pith-to-bark sequence; pentosans content decreases over the first 10-15 growth rings from the pith, after which it is approximately constant. Cellulose content of radiata pine increases over the first 10-15 growth rings from the pith, after which it is approximately constant. The carbohydrates in radiata pine are also briefly described.
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