同齢人工林の上層樹高―本数曲線の検討

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.