2014 Fiscal Year Final Research Report

Transport and biological accumulation of radionuclide in transitions from forest to agriculture lands in watersheds

Research Project

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Project/Area Number	24248058
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Research Field	Boundary agriculture
Research Institution	Tokyo University of Agriculture and Technology
Principal Investigator	GOMI Takashi 東京農工大学, (連合)農学研究科(研究院), 准教授 (30378921)
Co-Investigator(Kenkyū-buntansha)	TODA Hiroto 東京農工大学, 大学院農学研究院, 教授 (00237091) KIMURA Sonoko DOROTEA 東京農工大学, 大学院農学研究院, 准教授 (60397015) WATANABE Hirozumi 東京農工大学, 大学院農学研究院, 教授 (80323757) ASANO Yuko 東京大学, 大学院農学生命研究科, 講師 (80376566) MIZUGAKI Shigeru 独立行政法人土木研究所, 寒地土木研究所, 研究員 (10559686) NUNOKAWA Masanori 北海道大学, 大学院農学研究院, 研究員 (90389651) NEGISHI Junjiro 北海道大学, 大学院地球環境科学研究科, 准教授 (90423029)
Project Period (FY)	2012-05-31 – 2015-03-31
Keywords	放射性セシウム動態 / 渓流生態系 / 森林農地生態系 / 有機物動態 / 土壌特性 / 食物網 / 生物蓄積 / 流出
Outline of Final Research Achievements	Fukushima Dai-ichi Nuclear Power Plants accident caused radiocaesium contamination in forested areas. We analyzed transport and concentration of radiocaesium in aquatic and terrestrial ecosystems in watersheds with forest and agriculture transitions. Cs-137 distribution varied depending on topography, forest types, and landscape position. Cs-137 concentrations on streams tended to be lower than that on forest floor by leaching Cs-137 in aquatic environment. Level of radiocesium concentration in consumers depends on the level of contamination of primary producers available in consumers' habitat ranges. For fish species such as char, radiocaesium concentrations appeared to be greater in the individuals with greater body sizes. Findings of this study showed that the dynamics of radiocaesium via litter decomposition and transport in streams is a primal factor for understanding biological transfer of radiocaesium in terrestrial and aquatic environment of watershed ecosystems.
Free Research Field	流域水文学、生態系管理学