The relation among the four indices of stand density for well-managed plantations of old sugi (cryptomeria japonica d.don) and the reference value investigation of the indices correlated with the degree of crowing

Shigejiro Yoshida, Aya Tanaka, Tetsuji Ota, Nobuya Mizoue, Keiko Fukumoto

Research output: Contribution to journalArticle

Abstract

We analyzed the relation among the four indices of stand density for well-managed plantations of old Sugi (Cryptomeria japonica D.Don), and investigated the reference value of indices correlated with the degree of crowing. The analysis included the relative spacing index( Sr),a yield index based on the stand density control diagram(Ry),the ratio of mean height to diameter(H/D) and the percentage of crown length(CLp). As a result, the relation between Ry and Sr is the strongest of all relations. The index value of the degree of crowing for Ry, that is 0.8, reveals the equivalent of 14.8% of Sr. The results of previous studies revealed the same results, and the 15% of Sr is suggested for the value of the degree of crowing.

Original languageEnglish
Pages (from-to)77-80
Number of pages4
JournalNihon Ringakkai Shi/Journal of the Japanese Forestry Society
Volume100
Issue number3
Publication statusPublished - Jan 1 2018

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Cryptomeria japonica
stand density
normal values
plantation
plantations
spatial distribution
spacing
diagram
index

All Science Journal Classification (ASJC) codes

  • Forestry

Cite this

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title = "The relation among the four indices of stand density for well-managed plantations of old sugi (cryptomeria japonica d.don) and the reference value investigation of the indices correlated with the degree of crowing",
abstract = "We analyzed the relation among the four indices of stand density for well-managed plantations of old Sugi (Cryptomeria japonica D.Don), and investigated the reference value of indices correlated with the degree of crowing. The analysis included the relative spacing index( Sr),a yield index based on the stand density control diagram(Ry),the ratio of mean height to diameter(H/D) and the percentage of crown length(CLp). As a result, the relation between Ry and Sr is the strongest of all relations. The index value of the degree of crowing for Ry, that is 0.8, reveals the equivalent of 14.8{\%} of Sr. The results of previous studies revealed the same results, and the 15{\%} of Sr is suggested for the value of the degree of crowing.",
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T1 - The relation among the four indices of stand density for well-managed plantations of old sugi (cryptomeria japonica d.don) and the reference value investigation of the indices correlated with the degree of crowing

AU - Yoshida, Shigejiro

AU - Tanaka, Aya

AU - Ota, Tetsuji

AU - Mizoue, Nobuya

AU - Fukumoto, Keiko

PY - 2018/1/1

Y1 - 2018/1/1

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AB - We analyzed the relation among the four indices of stand density for well-managed plantations of old Sugi (Cryptomeria japonica D.Don), and investigated the reference value of indices correlated with the degree of crowing. The analysis included the relative spacing index( Sr),a yield index based on the stand density control diagram(Ry),the ratio of mean height to diameter(H/D) and the percentage of crown length(CLp). As a result, the relation between Ry and Sr is the strongest of all relations. The index value of the degree of crowing for Ry, that is 0.8, reveals the equivalent of 14.8% of Sr. The results of previous studies revealed the same results, and the 15% of Sr is suggested for the value of the degree of crowing.

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