| Project/Area Number |
25287138
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Shimane University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
入月 俊明 島根大学, 総合理工学研究科(研究院), 教授 (60262937)
井上 睦夫 金沢大学, 環日本海域環境研究センター, 准教授 (60283090)
辻本 彰 島根大学, 教育学部, 講師 (60570554)
林 広樹 島根大学, 総合理工学研究科(研究院), 准教授 (80399360)
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| Research Collaborator |
TAKATA Hiroyuki 釜山国立大学, 海洋学部, 研究員
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2014: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Keywords | 酸性化 / 汽水域 / 堆積速度 / 水循環 / 有機物負荷 / アンスロポシーン / 沿岸水の動態 / 地質学 / 層位・古生物学 / 環境変動 / 汽水域環境 / 沿岸汽水域 / 富栄養化 |
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| Outline of Final Research Achievements |
In order to clarify the acidification of brackish water, we carried out the measurements of sedimentation rate and dissolution of the meiobenthic calcareous foraminiferal tests in brackish lakes Shinjiko and Nakaumi. By using Pb-210 and Cs-137 methods, it was clarified that sedimentation rates and the processes are different in each side of the western and eastern Shinjiko. The change of sedimentation rate of organic matter occurred in the 1970's-80's in both lakes, and the decrease of Ra-226 transported by river from land occurred in the 1950's-60's. Dissolution of calcareous tests of foraminifera was distinct in lowered salinity. We confirmed that the dissolution of calcareous tests occurred in the high sedimentation and the high decomposition rates of organic matters, but the dissolution was buffered by marine water.
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