| Project/Area Number |
20K06335
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 41050:Environmental agriculture-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
菅野 均志 東北大学, 農学研究科, 准教授 (30250731)
濱本 亨 東北大学, 農学研究科, 助教 (80877100)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 土壌 / 鉄酸化物 / ヒ素 / 安定同位体 / 酸化還元 / 黒ボク土 / 鉄（水）酸化物 / 鉄鉄鉱物 / 水稲 |
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| Outline of Research at the Start |
本研究では、これまでの研究成果を基に、以下の３つの研究を行い、黒ボク土のもつ特異的なポイズ機能（酸化還元にたいする強い緩衝能・抵抗性）と土壌鉄の低溶解性のメカニズムを解明し、新たな水稲ヒ素低減技術につながる知見をうる。
[１] 湛水還元に伴う黒ボク土および非黒ボク土のマンガン・鉄・ヒ素溶出過程の比較解析
[２] 57Feを用いた黒ボク土における土壌鉄鉱物の特異的低溶解性のメカニズム解明
[３] 黒ボク土の特異的ポイズ機能を利用した水稲のヒ素低減効果の解明
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| Outline of Final Research Achievements |
The soil Fe elution was compared by adding 57Fe oxide to Andisol and non- Andisol and incubating them in water using 57Fe as a tracer. The soil Fe release from the non- Andisol was reduced by the addition of 57Fe, and the As release was also reduced. The Andisol did not reduce soil Fe leaching after the same addition. The electrons supplied by waterlogged incubation test were equally distributed between soil Fe and material Fe in the non- Andisol, suggesting that soil Fe is less electron-accepting in the Andisol.
Mixing of Andisol with alluvial soil resulted in a decrease in As concentration in the soil solution and an increase in the Si/As ratio, and the total As concentration in brown rice decreased. Under reducing conditions, Andisol has a high adsorption capacity for As(III), suggesting that amorphous iron and large amounts of silicate increase the relative amount of As and contribute to the reduction of As in brown rice.
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| Academic Significance and Societal Importance of the Research Achievements |
黒ボク土は、非黒ボク土に比べて、湛水培養における土壌鉄の溶解性が特異的に低いが、その詳細なメカニズムは十分に解明されていなかった．本研究では、安定同位体57Feをトレーサーとして含有する57Fe鉱物の利用により、「湛水条件下の黒ボク土における土壌鉄の低溶解性のメカニズムを解明した。この点が、既存の研究にはない、本研究の学術的独自性と創造性の中核となるものである．
また、本研究により、黒ボク土と非黒ボク土の鉄およびヒ素の挙動が解明されることで、農業や土壌管理における合理的な手法の確立、さらには玄米中のAs低減を通じた食品の安全性向上への貢献が期待される．
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