Understanding of radioceasum uptake by roots and mass transport model in rhizosphere

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K15003
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Rural environmental engineering/Planning
• Research Institution: The University of Tokyo
• Principal Investigator: Hamamoto Shoichiro 東京大学, 大学院農学生命科学研究科(農学部), 准教授 (30581946)
• Co-Investigator(Kenkyū-buntansha): 二瓶 直登 東京大学, 大学院農学生命科学研究科(農学部), 特任准教授 (50504065)
• Research Collaborator: NISHIMURA taku
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 根圏土壌 / 根箱 / 物質動態

Outline of Final Research Achievements

There are soils where applied Potassium (K) does not effectively work for reducing radioceasum (RCs) uptake by plant roots. In this study, K and RCs movements in such soils were investigated based on the column and batch experiments. In addition, using a rhizobox, effects of clay minerals on water and ion transport near roots was investigated. Results showed that the soils containing vermiculite highly adsorb the applied K as a fixed form, reducing exchangeable K in soils. In addition, rhizobox experiments showed that RCs and K uptakes and those concentration nearby roots were highly reduced when the vermiculite was applied to the soils.

Free Research Field

土壌物理学

Academic Significance and Societal Importance of the Research Achievements

本研究は粘土鉱物，特にバーミキュライト，の存在が根近傍域でのKおよびCs動態ならびに根によるイオン吸収に大きく影響を与えることを実験的に明らかにした．福島の畑地土壌におけるCs吸収抑制対策は重大な課題である．本研究成果から，作物によるCs吸収リスクの高い土壌のマッピングなど，今後の福島県内の汚染土壌対策や除染後畑地の土壌管理に関する重要な基礎的知見が得られた．