Abstract
X-ray microdensitometry was applied to a set of Scots pinewood (i.e. low extractive content). Earlywood and latewood properties were determined as minimum and maximum densities of each tree ring and the potential influence of acetone-soluble extractives (i.e. non-structural and secondary constituents of wood) was estimated using tree-ring statistics. The occurrence of extractives in different portions of wood was determined using dendrochronological methods, by comparing the densities of unextracted and extracted wood. It was not only found that unextracted samples exhibited inflated earlywood and latewood density values, but the growth trends were also altered. Extractives flattened the inter-annual growth variability, both in earlywood and latewood, and influenced the estimation of intra-annual radial growth variations. Characterizing the varying amount of extractives is of inter-disciplinary importance. The results in this study describe their occurrence and show that the radial variations in extractives could be highly detailed by simply using densitometry-based dendrochronology.
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Acknowledgments
We are grateful to Professor Heli Peltola for measuring the samples by X-ray microdensitometry (ITRAX) and for many useful comments on the earlier version of the manuscript. We acknowledge the people who measured the tree-ring widths, technicians of Saima Unit, Mr. Kari Tolvanen and Mr. Risto Tanninen, who also carried out the dendrochronological quality control of these series. The comments of several anonymous referees are acknowledged. The work of SH was supported by the Academy of Finland (Grant #122033).
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Helama, S., Vartiainen, M., Kolström, T. et al. Dendrochronological investigation of wood extractives. Wood Sci Technol 44, 335–351 (2010). https://doi.org/10.1007/s00226-009-0293-y
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DOI: https://doi.org/10.1007/s00226-009-0293-y