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The investigation for the conservation of the Fagus crenata forest in southern limit of distribution area

Research Project

Project/Area Number 10660151
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionKAGOSHIMA UNIVERSITY

Principal Investigator

ISHII Hiroshi  KAGOSHIMA UNIVERSITY, AGRICULTURE, PROFESSOR, 農学部, 教授 (90032557)

Co-Investigator(Kenkyū-buntansha) MIZUNAGA Hiromi  KAGOSHIMA UNIVERSITY, AGRICULTURE, ASSOCIATED PROFESSOR, 農学部, 助教授 (20291552)
SONE Koichi  KAGOSHIMA UNIVERSITY, AGRICULTURE, PROFESSOR, 農学部, 教授 (60264454)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsFagus crenata / Southern limit of distribution / Regeneration / 南限地
Research Abstract

The structure of beech (Fagus crenata) stands and the regeneration regimes of beech were investigated at the ridge in Mt. Takakuma, which is the southern limit of beech distribution.
(1) The height of beech in Takakuma is suppressed compared with the radial growh or the horizontal extension of the crown when the beech was taller than the shrub layer. Poor dominance of canopy tree species may be an indirect reason for such a change in the trade-off relationship between vertical and horizontal growth. However, although the height of beech in Takakuma was suppressed, death of beeches or obvious declines of radial growth were not observed.
(2) The density of the basal area and beech trees in Takakuma was as low as that of other Pacific Ocean type beech forests. The proportion of small trees with <10cm in Dbh to canopy trees with >20cm in Dbh was lower in 0.5. Furthermore, there were no saplings less than 2m in height even though Sasa was absent, although the gap ratio exceeded 50% in Mt. Takakuma.
(3) The nut production vas large in 1998, however there were remarkably few viable nuts because the proportion of empty nuts was nearly 80%. Although the mortality of nuts in winter season was low, there were no current seedlings whether Sasa was removed or not in the autumn of the mast year.
(4) The beech in Takakuma did not regenerate successfully, and other canopy tree species or the community of shrubs with Sasa may replace the beech stands.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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