| Project/Area Number |
18K05738
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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 40010:Forest science-related
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| Research Institution | Utsunomiya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
大久保 達弘 宇都宮大学, 農学部, 教授 (10176844)
飯塚 和也 宇都宮大学, 農学部, 教授 (20344898)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 放射性セシウム / スギ苗 / アンモニウム / カリウム / 吸収 / 移行 / 転流 / RI実験 / 硝酸化成 / 窒素 |
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| Outline of Final Research Achievements |
The pot test and RI experiment were carried out and the following results were obtained. Similar to K, NH4 + was found to have an inhibition of 137Cs absorption in Sugi seedlings. Since the soil has nitrification (reaction from NH4+ to NO3-) , it was shown that the effect of NH4 + decreased with nitrification.
The absorption and transfer of 137Cs in roots of Sugi seedlings was clearly suppressed by the coexistence of K. There was no effect of K treatment after the addition of 137Cs on the transfer of 137Cs from root to shoot. It was also suggested that high levels of K in shoot may increase the absorption and transfer of 137Cs from roots, but in some cases the opposite result was obtained. Furthermore, by experiments of Sugi shoot-cuttings confirmed that K suppressed the translocation of 137Cs to adventitious roots. Hereafter, it was necessary to examine in detail the interrelationship between 137Cs and K for each situation of absorption, transfer, and translocation.
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| Academic Significance and Societal Importance of the Research Achievements |
樹木の放射性Csの吸収移行と林床の挙動は、不溶態が大半を占める「全量」ではなく、「植物可給態（水溶性と希酸可溶性）」の放射性Csで評価されるべきである。可給態放射性Csの植物吸収や林床での挙動は、同じく植物可給態である、NやKなどの養分の動態に影響される。本研究は樹木や林床の放射性Csの挙動を、養分動態や植物の栄養生理に関連付けて、「農業分野の土壌肥料学的・植物栄養生理学的観点を森林科学分野に応用」しようとするものであり、新規な視点を提供することができた。また、森林科学分野では馴染みがないRIトレーサー実験を行ったことから、新しいツールを用いた研究例となった。
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