Growth characteristics of six tree species on Hokkaido Island, northern Japan

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  • Growth characteristics of six tree species on Hokkaido Island northern Japan

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<jats:p>Based on growth data obtained from 13 804 individual trees in 110 permanent plots, diameter at breast height (d.b.h.) growth was modeled for six major tree species growing in Hokkaido Island, northern Japan. For each species, d.b.h. growth was regressed on independent variables, indicating the effects of initial size, competition, climate and topography. In developing the d.b.h. growth models, independent variables were selected using the stepwise method. For all species analyzed, the final models accounted for significant amounts of the variation (<jats:italic>r<jats:sup>2</jats:sup></jats:italic> = 5.65−20.99%; <jats:italic>P</jats:italic> < 5%) in d.b.h. growth. Significant (<jats:italic>P</jats:italic> < 5%) effects of competition, climate and topography on d.b.h. growth were detected. The model obtained can be used in simulations of forest dynamics. Some ecological questions were examined using the d.b.h. growth models obtained. For hardwoods, the d.b.h. growth rate did not correlate with the published grouping of species in terms of shade‐tolerance; however, the plasticity in d.b.h. growth in the presence of competition seemed to be correlated with the shade‐tolerance of species. The degree of asymmetry in competition evaluated for each species was not correlated with the availability of underground resources, which was expressed by surrogate variables (mean values of climatic and topographic variables for species). The degree of asymmetry in competition was not different between conifers and hardwoods.</jats:p>

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