Effects of cultural system on the stand growth of Sugiplantation (<i>Cryptomeria japonica</i>) (III)

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Other Title
  • スギ人工林の生長におよぽす保育の影響 (III)
  • スギ人工林の生長におよぼす保育の影響-3-現実密度林分の現存幹材積の推定(H￣D￣-ρ-Vdiagram)
  • スギ ジンコウリン ノ セイチョウ ニ オヨボス ホイク ノ エイキョウ 3
  • 現実密度林分の現存幹材積の推定 (<i>〓</i>-<i>〓</i>-ρ-<i>V</i> diagram)
  • Estimate of the stem volume yield of stand under actual stand density (<i>_??_</i>-<i>_??_</i>-ρ-<i>V</i> diagram)

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Many Sugi stands (Cryptomeria japonica) are not in full density for mean D.B.H. of stand, so in this paper the method to estimate actual stem volume in these low density stands is studied. Between actual stem volume of stand (V) and mean D.B.H. (_??_) in each height class, the following relation has been pre-viously established: log V=log ρ +a log _??_+log b. This formula means that mean D.B.H. has to be introduced to estimate the actual stem volume of stand, in addition to stand density (ρ). Based on this idea, __??_-_??_-ρ-V diagram was made for Sugi stand. This diagram offers a useful method to estimate the actual stem volume in low density stands or in thinned stands, and to estimate even the volume of thinnings. This diagram will be helpful for cultural system including density control, thinning, yield, etc.

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