| Abstract | The distribution of acetone-soluble extractives in jack pine trees of different diameters, and at different locations within a single tree was studied. The amount of extractives varied from 3% in a 10 cm diameter tree to 9.6% in a 50 cm diameter tree. Within a single tree the top had the least amount of extract, 2.7%, while the needle bearing twigs had the greatest amount, 4.6%. Gas–liquid chromatographic analysis of the extracts showed that the composition was relatively similar for all sizes of trees and within one tree except in the top and the branches. The heartwood of the tree had a much higher extractive content than the sapwood and contained a higher concentration of resin acids, pinocembrin, and pinobanksin. |
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