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1990 Fiscal Year Final Research Report Summary

Stand Structure and Regeneration Dynamics of Old-Growth Chamaecyparis Stands in the Kiso District, Central Japan

Research Project

Project/Area Number 63560151
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionOkayama University

Principal Investigator

YAMAMOTO Shin-ichi  Okayama University Faculty of Agriculture Asso. Prof., 農学部, 助教授 (60191409)

Co-Investigator(Kenkyū-buntansha) CHIBA Kyozo  Okayama Univesity Faculty of Agriculture Professor, 農学部, 教授 (10036741)
Project Period (FY) 1988 – 1990
KeywordsCanopy gap / Chamaecyparis / Large-plot study / Litter fall / Kiso district / Regeneration dynamics / Seed production / Stand structure
Research Abstract

Stand structure and regeneration dynamics of old-growth Chamaecyparis stands in the Kiso district, central Japan, were studied during 1985 to 1990. A shape of dbh-class distributions was normal in Chamaecyparis obtusa dominated stands, but that was inverse J-shaped in a Chamaecyparis pisifera - hardwood stand. These shapes did not change for the five years. Mortality of canopy trees (dbh<greater than or equal>20cm) occurred in C. obtusa stand with 1.3-3.1% mortality, but no canopy trees died in the C. pisifera - hardwood stnd. Mortality of understory trees (dbh<20cm, height<greater than or equal>1.3cm) was 8.3-22.9% and the value of Thujopsis dolabrata was 12.2-22.9%. Abundance of new seedlings fluctuated annually ; many seedlings of C. obtusa emerged in 1986 and those of C. pisifera emerged in 1987 and 1989. Ex-posed mineral soils in a recently disturbed stand was the most favourable site for seedling recruitment of C. obtusa. Seed production of Chamaecyparis also fluctuated annually ; 4,479 seeds per sq. m of C. obtusa was produced in a abundant year and 4,324 seeds per sq. m for C. pisifera. Amount of leaf litter-fall was about 3ton/ha/yr in C. obtusa stands. There were 7,186 trees (dbh<greater than or equal>5cm) including 718 dead trees in a 4ha plot ; dbh class distributions of C. obtusa and C. pisifera were bimodal in shape without lacked classes and the kistribution of Quercus mon-golica var. grosseserrata was also bimodal but with lacked classes. The distribution of T. dolabrata showed inverse J-shaped. Canopy trees of C. obtusa randomly dispersed, but the understory trees did patchily. Canopy trees of T. dolabrata showed a nearly random distribution, and the understory trees occurred over a whole area in the plot. C. pisifera showed a nearly random in its distribution of canopy trees and a patchy distribution in the understory trees. Understory trees of Q. mongolica also showed a patch

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Shinーichi Yamamoto: "Structure and dynamics of oldーgrowth Chamaecyparis stands in the Kiso district,central japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinーichi Yamamoto: "Seedling recruitment of some conifers in oldーgrowth Chamaecyparis stands of the Kiso district,central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinーichi Yamamoto: "Seed production and litter fall dynamics in oldーgrowth Chamaecyparis stands of the Kiso district,central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinーichi Yamamoto: "Size class structure and tree dispersion pattern in an oldーgrowth Chamaecyparis stand of the Kiso district,central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shin-ichi Yamamoto: "Structure and dynamics of old-growth Chamaecyparis stands in the Kiso district, central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shin-ichi Yamamoto: "Seedling recruitment of some conifers in old-growth Chamaecyparis stands of the Kiso disteict, central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shin-ichi Yamamoto: "Sees production and litter fall dynamics in old-growth Chamaecyparis stands of the Kiso district, central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shin-ichi Yamamoto: "Size class structure and tree dispersion pattern in an old-growth Chamaecyparis stand of the Kiso district, central Japan" Canadian Journal of Forest Research.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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