Analysis of the diameter distribution using the Richards distribution function (III) : Relationship between mean diameter or diameter variance and parameter m or k of uniform and even-aged stands

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  • RICHARDS分布関数を用いた直径分布の解析(III) : スギ一斉同齢林について平均直径および直径の分散とパラメータm,kとの関係
  • RICHARDS分布関数を用いた直径分布の解析(3)スギ一斉同齢林について平均直径および直径の分散とパラメータm,kとの関係
  • RICHARDS ブンプ カンスウ オ モチイタ チョッケイ ブンプ ノ カイ

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The Richards distribution function was fitted to the diameter distribution data of uniform and even-aged stands. Estimated values of parameter m and k were examined. The effectiveness was assessed by the test of goodness of fit. The correlation coefficient between age and parameter k was larger than between age and parameter m. Parameter k decreased as the stand grew older. The observed correlation coefficient between both mean diameter and diameter variance and parameter m was statistically significant, but was not large. There was a high linear relation between both mean diameter and diameter variance and parameter k. Further there was a higher linear relation between both the logarithm of mean diameter and diameter variance and the logarithm of parameter k.

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