| Project/Area Number |
22560553
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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 |
Civil and environmental engineering
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| Research Institution | Fukuoka Institute of Health and Environmental Sciences |
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Principal Investigator |
KUMAGAI Hiroshi 福岡県保健環境研究所, その他部局等, 研究員 (30446869)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Yoshito 福岡県保健環境研究所, その他部局等, 研究員 (20446868)
ISHIBASHI Yuko 福岡県保健環境研究所, その他部局等, 研究員 (90463512)
MATSUO Hiroshi 福岡県保健環境研究所, その他部局等, 研究員 (90446865)
大石 興弘 福岡県保健環境研究所, その他部局等, 研究員 (90446857)
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| Co-Investigator(Renkei-kenkyūsha) |
KUSUDA Tetsuya 北九州市立大学, 国際環境工学部, 教授 (50037967)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 溶存態ケイ素 / 有明海 / 植物プランクトン / 珪藻 / 無機態リン / 無機態窒素 / 必須栄養塩 / 培養実験 |
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| Research Abstract |
A survey was conducted on dissolved silicon (Dsi) and other nutrient salt concentrations and plankton in the northeastern area of the Ariake Sea to examine the effects of Dsi on the coastal ecosystem. The Dsi concentration in the area decreased twice a year. A significant decrease in Dsi was particularly noted in February and March, and dissolved inorganic phosphorus (DIP) also reduced. The decreases are presumably due to the proliferation of large diatoms, including Eucampia spp. Significant decreases in nutrient salt ratios were also noted: the Dsi/DIN ratio was 1 or lower and the Dsi/DIP ratio was 10 or lower. The spatial distribution of the nutrient salt concentration didn’t make the differences of the species of phytoplankton during this period. However, Dsi was identified as a limited factor for diatom growth within about 2 months.
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