DBH, height, and crown radius growth of some component species of Nopporo National Forest, central Hokkaido, Japan

IR 2 Citations
  • ISHIKAWA Y.
    Department of Forestry and Landscape Architecture, Hokkaido College, Senshu University
  • Ito Koji
    Department of Biosystem Management, Division of Environmental Conservation, Graduate School of Environmental Science, Hokkaido University

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Abstract

A survey on the relationships between age and size in some component trees of mixed forests was conducted in Nopporo National Forest, central Hokkaido. The relationship between age and DBH (diameter at breast height -1.3 m-) was well represented in seventeen species by linear regression equation. Power function regression showed the best fit to the age and height data in them. The relationship between age and crown area was well represented in eleven species by linear regression, although the scatters of data points were larger than those in other cases. According to the linear relationship between age and crown area, annual growth rates of crown radius were able to be estimated for six species. They decreased simply as trees grew older, and ranged from 2.4 cm/year (Tilia japonica Simonkai) to 1.3 cm/year (Ostrya japonica Sarg.) when each tree reached the canopy layer. The regressions by extended relative growth law showed better fits to the DBH and height data than the linear regression. The results of the present study indicated that the maximum height and longevity determining the dominance of trees in canopy layers did not wholly correlate to their shade tolerance.

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