*Yukiko Abe¹, Naishen Liang², Jun Koarashi³, Mariko Atarashi-Andoh³, Munemasa Teramoto², Shoji Hashimoto^1,4, Takeshi Tange¹ (1.Graduate School of Agricultural and Life Sciencies, The University of Tokyo, 2.Center for Global Environmental Research, National Institute for Environmental Studies, 3.Japan Atomic Energy Agency, 4.Forestry and Forest Products Research Institute)