Research Institute for Sustainable Humanosphere



  • 第241回定例オープンセミナーは2018年12月19日(木)12時30分~13時20分に総合研究実験1号棟5階HW525にて開催します。
  • 宇治キャンパス建物配置図PDFファイル
  • 定例オープンセミナー開催日・題目・発表者の一覧
  • 第34回からオープンセミナーの回数は2004 (平成16)年度からの通し番号表示にしました。
  • 2008年度より開始時刻および終了時刻は12:30~13:20になりました。
  • 年度末に萌芽ミッション研究の総決算として「生存圏萌芽・融合ミッションシンポジウム」を開催します。

第241回定例オープンセミナー(2018年12月19日 12:30,於HW525)

【発表者】 大橋伸太 (森林総合研究所・研究員)
【題目】 Radiocesium dynamics in forests and woods after the Fukushima Dai-ichi Nuclear Power Plant accident
【内容】 The Fukushima Dai-ichi Nuclear Power Plant accident occurred in March 2011 caused extensive radiocesium (137Cs) contamination in eastern Japan. In particular, forests are the most contaminated part on the land and will be the largest reservoir of 137Cs for decades or more because of their high land coverage rate (ca. 70 %), high 137Cs interception efficiency by branches and leaves, and high 137Cs adsorption ability of soils. Transfer of 137Cs into stem woods is also a matter of great concern. While the 137Cs transfer from foliage and bark surfaces can be a main source of the initial 137Cs contamination in woods, the amount of 137Cs transfer via root is the decisive factor for the long-term contamination. Thus, understanding the 137Cs dynamics in the forests and woods is critically important for both human activities in the forests and usage of forest products including woods in the future.
To assess the actual situation of the 137Cs contamination and understand the 137Cs dynamics in forest ecosystems, a monitoring survey have been conducted by FFPRI since 2011. It showed that the 137Cs distribution in the forests changed drastically in the first several years but afterward it was relatively steady and more than 90 % of the 137Cs in the forest has come to exist in forest floor (organic and mineral soil layers). Although the percentage of 137Cs distribution in woods is quite small, 137Cs concentration in woods of some tree species showed increasing trends at some study sites. Further monitoring surveys and detailed researches are necessary to predict the 137Cs contamination in woods accurately.
【資料】 第241回 Web ページ | PDF ファイル(176 205 バイト)


  • 2019-01-23 第242回定例オープンセミナー
    川嶋宏彰 (京都大学大学院情報学研究科・准教授)

オープンセミナーの風景 1オープンセミナーの風景 2