| Project/Area Number |
13680597
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Gunma University |
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Principal Investigator |
AOKI Shigenobu GUNMA UNIVERSITY, FACULTY OF SOCIAL AND INFORMATION STUDIES, PROFESSOR, 社会情報学部, 教授 (90134527)
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| Co-Investigator(Kenkyū-buntansha) |
KACHI Naoki TOKYO METROPOLITAN UNIVERSITY, GRADUATE SCHOOL OF SCIENCE, PROFESSOR, 理学研究科, 教授 (30124340)
ISHIKAWA Shinichi GUNMA UNIVERSITY, FACULTY OF SOCIAL AND INFORMATION STUDIES, VICE PROFESSOR, 社会情報学部, 助教授 (80251015)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | ALIEN PLANTS / AMBROSIA TRIFIDA / LIFE HISTORY / GROWTH ANALYSIS / MYCORRHIZA / NITROGEN FORM / STRESS TORELANCE / EVOLUTION / 光環境 / 温度環境 / 発芽 / 可塑性 |
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| Research Abstract |
GROWTH ANALYSIS AND MYCORRHIZAL FORMATION ANALYSIS WERE CONDUCTED FOR SEEDLING S OF AMBROSIA TRIFIDA, AN ALIEN PLANT SPECIES, IN ENVIRONMENTAL SIMULATORS WITH THREE NITROGEN CONDITIONS (NO NUTRITION, HIGH AMMONIA-FORMED NITROGEN RATIO, AND HIGH NITRATE-FORMED NITROGEN RATIO). RELATIVE GROWTH RATES (RGRS) OF SEEDLINGS SAMPLED FROM MINAKAMI, AT NORTHERN SITE UNDER COLD CLIMATE AND WITH HIGH AMMONIA-FORMED NITROGEN RATIO IN THE SOIL, WERE ALWAYS LOWER THAN THOSE OF SEEDLING FROM ISESAKI, AT CENTRAL JAPAN UNDER WARM CLIMATE AND WITH HIGH NITRATE-FORMED NITROGEN RATIO IN THE SOIL, INDEPENDENT OF THE NITROGEN CONDITIONS. MYCORRHIZAL FORMATION WAS AROUND 70% OF THE ROOTS, INDEPENDENT OF THE NITROGEN CONDITIONS. THESE RESULTS SUGGEST THAT, THIS ALIEN PLANT SPECIES, WHICH IS REPORTED THAT IT HAS ALREADY HAD COMPETITIVE AND RUDERAL STRATEGIES, MAY BE UNDER EVOLUTION TO HAVE STRESS-TOLERANCE STRATEGY.
WITH THESE FINDINGS, SOME STATISTICAL METHODS FOR ANALYZING THE CHRONIC CHANGES OF LIFE HISTORY TRAITS WERE EXAMINED AND FRAME-WORKS FOR MAKING A NEW MATHEMATICAL MODEL FOR PLANT DEMOGRAPHY, WHICH INCLUDES THE STOCHASTIC ASPECTS OF THE LIFE HISTORY TRAITS, WERE CONSTRUCTED.
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