Effects of individual size, local competition and canopy closure on the stem volume growth in a monoclonal Japanese cedar (Cryptomeria japonica D. Don) plantation

Sumihiro Inoue, Tetsuoh Shirota, Yasushi Mitsuda, Hiroaki Ishii, Koichiro Gyokusen

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We studied how the dominant factor affecting stem volume growth changes during stand development in a monoclonal stand of Cryptomeria japonica D. Don. Stem analysis was used to compare growth history of trees in an unthinned plot (closed canopy) and a thinned plot (open canopy). In the unthinned plot, the dominant factor affecting stem volume growth was basal area (BA) before canopy closure, whereas neighborhood competition index (CI) was the dominant factor after canopy closure. In contrast, the dominant factor affecting stem volume in the thinned plot was BA throughout stand development. Spearman's rank correlation coefficient between BA and CI continued to increase after canopy closure and size rank among individuals became increasingly fixed. Our results indicated that stem volume growth shifts from size-dependent to competition-dependent growth at canopy closure. The apparent correlation between tree size and growth rate observed in many previous studies may be the result of competition-mediated positive feedback between size and growth.

Original languageEnglish
Pages (from-to)953-964
Number of pages12
JournalEcological Research
Volume23
Issue number6
DOIs
Publication statusPublished - Nov 2008

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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