Applicability of Growth Equations to the Growth of Trees in Stem Radius (I)

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  • 樹幹半径の生長に対する生長曲線の適合性 (I)
  • 樹幹半径の生長に対する生長曲線の適合性-1-シロトウヒの場合〔英文〕
  • ジュカン ハンケイ ノ セイチョウ ニ タイスル セイチョウ キョクセン ノ
  • シロトウヒの場合
  • Application to White Spruce

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Existing growth equations were classified into four groups according to their theoretical nature, that is, the empiricals, the quasi-theoreticals, the particular theoreticals, and the general theoreticals. An examination on an a priori basis revealed that the last group would be the most suitable for describing the growth of trees in stem radius. Then, the application of three representative equations of this group, that is, the MITSCHERLICH, the Logistic, and the GOMPERTZ, to the observed radial growth of 84 white spruce (Picea glauca (MOENCH) VOSS) showed that the easiest to fit to the observed growth was the MITSCHERLICH and that the best fit was achieved by the GOMPERTZ. The most significant finding in this work was that, contrary to ordinary belief, these three theoretical equations did not work necessarily in application as expected from the theory. This discrepancy between the theory and reality was most conspicuous in the Logistic equation, then in the GOMPERTZ, and least in the MITSCHERLICH. Thus it is difficult, with the present state of knowledge, to decide on the most appropriate equation for the radial growth of trees. Further research of a similar <br>nature is recommended with different tree species and criteria.

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