Effects of ionizing radiation on soil ecosystem functioning

• Project/Area Number: 18710051
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Risk sciences of radiation/Chemicals
• Research Institution: National Institute of Radiological Sciences
• Principal Investigator: ISHII Nobuyoshi National Institute of Radiological Sciences, 放射線防護研究センター, 主任研究員 (50392212)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,720,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥120,000); Fiscal Year 2008: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2007: ¥500,000 (Direct Cost: ¥500,000); Fiscal Year 2006: ¥2,700,000 (Direct Cost: ¥2,700,000)
• Keywords: 放射線 / 影響 / 生態系 / 機能 / 微生物 / 群集

Research Abstract

土壌には多種多様な微生物が生息しており、生態系における栄養塩や金属元素等の物質循環に重要な役割を果たしている。それ故、農耕地において作物が収穫できるのは、これら微生物の働きによるところが大きい。本研究では、水田土壌に生息する細菌群集に着目し、放射線に暴露された時の反応、そして土壌から溶出したイオンや元素量の変化について検討した。1 Gy/dayの線量率で5日間ガンマ線に連続暴露された水田土壌では、微生物群集の種組成が変化すること、そして溶存鉄濃度が低くなる一方で、硫酸イオン濃度が高くなることを明らかにした。

Research Products

• [Journal Article] Application of a droplet-PIXE system to study radiation effects on ecosystem functioning (2007)
  • Author(s): Ishii,N., S.Homma-Takeda, K.Tagami, S.Fuma, H.Takeda
  • Journal Title: International Journal of PIXE 17 Pages: 161-167
  • Peer Reviewed
• [Journal Article] Impact of gamma irradiation on the transformation efficiency for extracellular plasmid DNA (2007)
  • Author(s): Ishii,N., T.Sakashita, H.Takeda, Y.Kubota, S.Fuma, M.Doi, S.Takahashi
  • Journal Title: Journal of Environmental Radioactivity 97 Pages: 159-167
  • Peer Reviewed
• [Journal Article] Application of a droplet-PIXE system to study radiation effects on ecosystem functioning (2007)
  • Author(s): Nobuyoshi ISHII
  • Journal Title: International Journal of PIXE 3&4 Pages: 161-167
  • Peer Reviewed
• [Journal Article] Impact of gamma irradiation on the transformation efficiency for extracellular plasmid DNA (2007)
  • Author(s): Nobuyoshi ISHII
  • Journal Title: Journal of Environmental Radioactivity 97 Pages: 159-167
  • Peer Reviewed
• [Presentation] Effects of ionizing radiation on bacterial community (2008)
  • Author(s): Nobuyoshi ISHII
  • Organizer: The 7th Japan-France Workshop on Radiation Biology
  • Place of Presentation: 千葉、放医研
  • Year and Date: 2008-10-16
• [Presentation] Effects of ionizing-radiation on bacterial community (2008)
  • Author(s): Nobuyoshi ISHII, Shoichi Fuma, Taizo Nakamori, Shino Homma-Takeda, Keiko Tagami, Satoshi Yoshida
  • Organizer: The 7th Japan-France Workshop on Radiation Biology
  • Place of Presentation: Chiba
• [Presentation] 土壌細菌群集に対する放射線の影響評価 (2007)
  • Author(s): 石井 伸昌
  • Organizer: 日本放射線影響学会 第50回大会
  • Place of Presentation: 千葉、幕張
  • Year and Date: 2007-11-15
• [Presentation] 湛水土壌からの鉄溶出に対する放射線の影響 (2007)
  • Author(s): 石井 伸昌
  • Organizer: 日本陸水学会 第72回大会
  • Place of Presentation: 茨城大学
  • Year and Date: 2007-09-11
• [Presentation] Effects of ionizing radiation on soil bacterial community and their functioning (2007)
  • Author(s): Nobuyoshi ISHII
  • Organizer: Japan-Ukraine international meeting on radioecology: 20years after Chernobyl, what should be next?
  • Place of Presentation: 千葉、放医研
  • Year and Date: 2007-03-01
• [Presentation] 細菌群集に対する放射線の影響 (2007)
  • Author(s): 石井伸昌
  • Organizer: 第2回放医研放射線防護研究センターシンポジウム
  • Place of Presentation: 千葉
• [Presentation] 土壌細菌群集に対する放射線の影響評価 (2007)
  • Author(s): 石井伸昌, 府馬正一, 武田洋
  • Organizer: 日本放射線影響学会第50回大会
  • Place of Presentation: 千葉
• [Presentation] Effect of gamma irradiation on the transformation efficiency for extracellular plasmid DNA (2007)
  • Author(s): Ishii,N., T.Sakashita, H.Takeda, Y.Kubota, S.Fuma, M.Doi,S.Takahashi
  • Place of Presentation: Cheju, Korea
• [Presentation] 湛水土壌からの鉄溶出に対する放射線の影響 (2007)
  • Author(s): 石井伸昌, 武田志乃, 田上恵子, 府馬正一, 武田洋
  • Organizer: 日本陸水学会第72回大会
  • Place of Presentation: 水戸
• [Presentation] ffects of ionizing radiation on soil bacterial community and their functioning (2007)
  • Author(s): Ishii,N., S.Homma-Takeda, K.Tagami, N.Ogiu, S.Fuma, H.Takeda
  • Organizer: Japan-Ukraine International meeting on Radioecology: 20 years after Chernobyl. What should be next?
  • Place of Presentation: Chiba
• [Presentation] Effect of gamma irradiation on the transformation efficiency for extracellular plasmid DNA (2007)
  • Author(s): Nobuyoshi ISHII
  • Organizer: International symposium of river and lake environment
  • Place of Presentation: 韓国、済州