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Abstract
Changes in pinosylvin concentration and distribution across the sapwood/heartwood boundary were studied on Scots pine (Pinus sylvestris L.) tree stems to detect seasonal activity in heartwood formation. Pinosylvin concentrations were measured with FT-(NIR) Raman spectroscopy for a total of 96 trees equally distributed on 16 different sampling occasions. In another experiment, cores were sampled every month from six individual Scots pine trees from June to October and analysed for pinosylvin. There was a great between-tree variation in concentration and spatial distribution of pinosylvin. No seasonal trend in the distribution pattern or concentration of pinosylvin was found. Therefore, the results indicate that there is no specific period during the year when heartwood is formed.
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