Abstract
We investigated the characteristics and variability of radial growth patterns and the occurrence of growth releases in dominant trees in two old-growth forests in eastern Finland, one dominated by Picea abies and the other by Pinus sylvestris. The dominant trees exhibited high variation in radial growth patterns suggesting that the trees had experienced very different growing conditions and competitive situations during their lifespans. Based on visual evaluation, five types of radial growth patterns were distinguished: descending, even, unimodal (one peak in the growth rate), bimodal (two peaks in the growth rate with an intermediate depression) and fuzzy (no clear pattern). One or more growth releases were detected in 18% of the sampled Picea and in 21% of the Pinus trees. In both the Picea- and the Pinus-dominated sites, the temporal distribution of growth releases was relatively even, except for a moderate peak in 1855–1860. This suggests that small-scale disturbances have been the predominant disturbance mode in both sites during the last 150 years. We conclude that the detected variability in radial growth patterns likely reflects the overall small-scale heterogeneity of structure and developmental processes that are typical of old-growth forests.
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Acknowledgments
We thank Tuomo H. Wallenius, Annikki Mäkelä and Shawn Fraver for help and advice in various stages of the study.
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Niukkanen, L., Kuuluvainen, T. Radial growth patterns of dominant trees in two old-growth forests in eastern Fennoscandia. J For Res 16, 228–236 (2011). https://doi.org/10.1007/s10310-011-0259-4
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DOI: https://doi.org/10.1007/s10310-011-0259-4