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The role of dioecious species on the regeneration dynamics and species

Research Project

Project/Area Number 08660189
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionShimane University (1998)
Kyoto University (1996-1997)

Principal Investigator

KAWAGUCHI Hideyuki  Shimane University, Faculty of Life and Environmental Science, Associate Professor, 生物資源科学部, 助教授 (40202030)

Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsCoexistence / Community structure / Dioecy / Population structure / Forest regeneration / Seed dispersal / Spatial heterogeneity / Spatial pattern / 成長速度 / 分布相関
Research Abstract

1. Spatial patterns of two co-dominant dioecious tree species, Podocarpus nagi and Neolitsea aciculata, were analyzed at Mt. Mikasa, Nara City, Japan. Podocarpus nagi has a higher shade tolerance but a narrower seed dispersal range than N.aciculata. We examined the effects of dioecy on regeneration and coexistence of the two species.
2. Seeds of F.nagi are dispersed by gravity around female trees. Young plants of P.nagi were clumped and showed significant attraction to large female trees and significant repulsion from large male trees. Dioecy therefore affected the spatial heterogeneity of plant density in the P.nagi population.
3. Seeds of N.aciculata are widely dispersed by birds and young plants of N.aciculata therefore showed no significant attraction to female trees. This wide dispersal of seeds moderated the effects of dioecy on the spatial pattern in N.aciculata.
4. Large N.aciculata trees were clumped and showed significant attraction to large male P.nagi trees, suggesting that growth of N.aciculata is facilitated, where young P.nagi plants are uncommon and competition is therefore less intense.
5. One effect of dioecy may be to produce a population structure for P.nagi which promotes its coexistence with N.aciculata.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] S.Nanami, H.Kawaguchi and T.Yamakura: "Dioecy-induced spatial patterns of two co-dominant tree apecies, Podocarpus nagi and Neolitsea aciculata." Journal of Ecology. 87(印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Satoshi NANAMI,Hideyuki KAWAGUCHI and Takuo YAMAKURA: "Dioecy-induced spatial patterns of two co-dominant tree species, Podocarpus nagi and Neolitsea aciculata" Journal of Ecology. Volume 87 (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Minami,E.et al.: "Polymorphic microsatellite markers in Japanese horse chestnut Aesculus turbinata Blume." Molecular Ecology. 7・11. 1616-1617 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Enoki,T.et al.: "Nitrogen resorption from needles of Pinus thunbergii Parl.growing along a topographic gradient of soil nutrient availability." Ecological Research. 14・1(発表予定). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Enoki,T.et al: "Nutrient-uptake and nutrient-use efficiency of Pinus thunbergiiParl.along a topographical gradient of soil nutrient availability." Ecological Research. 12・2. 191-199 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nakashizuka,T.et al: "Production-dependent reproductive allocation of a tall tree species Quercus serrata." Journal of Plant Research. 110・1. 7-13 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Enoki,T.et al.: "Topographic variations of soil properties and stand structure in a Pinus thunbergii plantation" Ecological Research. 11・3. 299-309 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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