2016 Fiscal Year Final Research Report
Weakening mechanism of aquatic flora due to mass generation of floating-leaved plants on a pond
| Project/Area Number |
15K16151
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental and ecological symbiosis
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| Research Institution | Nihon University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 溜池 / 浮葉植物 / 光阻害 / 溶存酸素 / 貧酸素化 / 吹送流 / 生物多様性 / 水生植物相の貧弱化 |
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| Outline of Final Research Achievements |
Mass generation of floating-leaved plants can cause light attenuation and poor oxygenation in a pond. Consequently, rare submerged plants are reduced, and thus, aquatic flora may be weakened. The weakening mechanism of aquatic flora has not been clarified. In this study, field observations and laboratory experiments were conducted on Lake Nanko of Shirakawa City, Fukushima Prefecture, and a part of the mechanism was clarified. The results are as follows: 1）light in water attenuates when the density of the floating-leaved plant is high. Therefore, it is hypothesized that the growth of the submerged plant is obstructed by the mass generation of the floating-leaved plants; 2）wind-induced flow attenuates when the density of the floating-leaved plant is high. The effect of this phenomenon on dissolved oxygen was not confirmed; and 3）the bottom layer of summer was poor oxygen water. The cause was breath and rot of the hydrophyte.
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| Free Research Field |
水環境工学
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