| Project/Area Number |
09304073
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生態
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KIKUZAWA Kihachiro Kyoto University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (50271599)
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| Co-Investigator(Kenkyū-buntansha) |
UMEKI Kiyoshi Hokkaido Forestry Research Institute, Researcher, 研究職員
OSAWA Akira Faculty of Intercultural Communication, Ryukoku University, Associate Professor, 国際文化学部, 助教授
ASANO Tohru (NAKASHIZUKA Tohru) Center for Ecological Research, Kyoto University, Professor, 生態学研究センター, 教授 (00281105)
YAMASAKI Michimasa Kyoto University, Graduate School of Agriculture, Assistant Professor, 農学研究科, 助手 (80263135)
TAKAYANAGI Atsushi Kyoto University, Graduate School of Agriculture, Lecturer, 農学研究科, 講師 (70216795)
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| Project Period (FY) |
1997 – 1999
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| Keywords | competition-density effect / yield-density effect / self thinning / 3 / 2th power law / one sided competiton / asymmetric competition / MNY method / individual size |
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| Research Abstract |
A synthetic theory was constructed which can comprehend the three well known laws and rules in plant population ecology; yield and density relationship first found by Kira et al (1953) and later formulated by Shinozaki and Kira (1956), -3/2 power rule of self thinning (1963) and size frequency distribution or MNY method proposed by Hozumi et al (1968). Kobayashi and Kikuzawa (submitting to Journal of theoretical Biology) proposed a new fundamental growth equation in which growth of a plant can be described by weight of itself, effect of surrounding plants larger than the focal plant and the effect of all surrounding plants. Integration of this equation can derive yield density relationship and integration of this equation under different critical conditions can derive Y-N relationship. Under complete one-sided competition, yield density relationship and Y-N relationship conincide completely which was already derived intuitively by Kikuzawa (1999). By incorporating an allometry between maximum tree height and tree weight and dry matter density of a stand, parametric relationship in a Y-N curve was derived. A growth equation was derived from the Y-N relation. By differentiating with time the growth equation and obtaining the weight in which growth becomes zero, the self-thinning equation was derived. This self thinning equation is more comprehensive equation involving 3/2 power law.
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