島根大学農学部研究報告

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島根大学農学部研究報告 25
1991-12-21 発行

同齢人工林の上層樹高―本数曲線の検討

Analysis of the Height-Number Curve for Even-Aged Stands
稲田 充男
ファイル
内容記述(抄録等)
Applying the Gompertz growth equation,the auther derived the formual for height-number curve in even-aged forest stands. The mathematical expression of the height-number curve is
N = d - aexp [ - bexp (cH)]
where N is a tree number,H is a stand height and a, b, c, d, are constants.
The applicability of this equation was examined by applied it to the observed height-number relationships. The goodness of fit of the equation was good enough for use in comparison with following existing height-number equaiton,
when H < H_0, N = α exp (-βH)
when H ≧ H_0, N = γ exp (-δH)
where N is a tree number, H is a stand height and H_0, α,β,γ,δ are constants.