Behavior of radiocesium derived from irrigation water in paddy fields and its effects on radioactivity in rice
| Project/Area Number |
19H03072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 41030:Rural environmental engineering and planning-related
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| Research Institution | Niigata University |
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Principal Investigator |
HARADA NAOKI 新潟大学, 自然科学系, 教授 (50452066)
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| Co-Investigator(Kenkyū-buntansha) |
吉川 夏樹 新潟大学, 自然科学系, 教授 (90447615)
鈴木 一輝 新潟大学, 研究推進機構, 助教 (40801775)
宮津 進 新潟大学, 自然科学系, 助教 (30757844)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2021: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2019: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Keywords | 放射性セシウム / イネ / 水田 / 灌漑水 / 水口 / 懸濁態画分 / 溶存態画分 |
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| Outline of Research at the Start |
本研究では，灌漑水から流入する溶存態および懸濁態放射性セシウム(rCs)の水田内での水平移動のシミュレーションモデルを現地調査に基づいて作成し，また各化学形態のrCsのイネへの吸収メカニズムを解明することを通して，水田における「水→土壌→イネ」に至るrCsの動態を仔細に明らかにすることを目的とする。そのために初年度からの2年間においては，①灌漑水由来rCsの水田内挙動の調査とモデル化，および，②灌漑水由来rCsのイネへの移行メカニズム解明，を試みる。その結果を踏まえ，最終年度は灌漑水由来rCsのイネへの移行を防ぐ栽培管理技術について検討し，本研究から得られる知見の社会への還元を目指す。
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| Outline of Final Research Achievements |
The purpose of this study was to elucidate the mechanisms by which the inflow of irrigation water containing low concentrations of radiocesium (rCs) increases rCs concentration in rice plants near the water inlet. 137Cs in irrigation water was monitored in an agricultural channel in Hamadori district, Fukushima, and the stock of 137Cs in the water vegetation was estimated. The tracer experiment confirmed that dissolved 137Cs migrates from the base of rice plants to the paddy. 137Cs in the irrigation water-derived sediments added to the soil surface was shown to be absorbed by rice plants. A model rice field filled with non-contaminated soil installed in Namie Town showed the two-dimension deposition of 137Cs in irrigation water onto the soil surface. It was concluded that dissolved 137Cs bottomed up rice 137Cs concentration, while suspended 137Cs was transferred to rice plants after deposition on the soil surface near the water inlet, further increasing the rice 137Cs concentration.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，放射性セシウム(rCs)を低濃度に含む灌漑水の流入が有意に水口のイネのrCs濃度を高める原因の解明のため，現地調査と模型水田実験およびポット実験等に取り組んだ。その結果，灌漑水中に含まれる溶存態rCsは水口イネのrCs濃度のボトムアップ的な増加に寄与し，さらに懸濁態137Csが水口近傍の土壌表面に沈着後，イネに移行してそのrCs濃度をさらに上昇させることが示された。本研究により，灌漑水に含まれるrCsの水田内での詳細な動態とイネへ移行してそのrCs濃度の上昇に至るメカニズムが初めて明らかとなった。
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Report
(4 results)
Research Products
(19 results)
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[Journal Article] Elevated rice 137Cs concentrations near the water inlet in paddy fields after the Fukushima nuclear accident2022
Author(s)
Suzuki Y, Shoji R, Tsurumaki T, Tamaki S, Nakashima K, Miyazu S, Yoshikawa N, Ishii H, Nogawa N, Nonaka M, Suzuki K, Harada N
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Journal Title
Journal of Radioanalytical and Nuclear Chemistry
Volume: Accepted
Related Report
Peer Reviewed
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[Presentation] Transfer of radiocesium from irrigation water to rice2019
Author(s)
Y. SUZUKI, T. IIZUKA, T. MATSUBARA, R. INABA, S. MIYAZU, T. GOMEI, K. ITO, M. SHIN, N. YOSHIKAWA, N. NOGAWA, K. SUZUKI, N. HARADA
Organizer
5th International Conference on Environmental Radioactivity
Related Report
Int'l Joint Research
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