*YUPAN ZHANG ¹, Yuichi Onda¹, Hashimoto Asahi¹, Shiori Takamura¹, Chiu Chiu², Takashi Gomi² (1.Center for Research in Isotopes and Environmental Dynamics, 2.Department of International Environmental and Agricultural Science, Tokyo University of Agriculture and Technology)

*Shiori Takamura¹, Yuichi Onda², YUPAN ZHANG ³, ASAHI HASHIMOTO³, Hiroaki Kato², Takashi Gomi⁴, CHEN WEI CHIU⁵ (1.Univercity of Tsukuba, 2.Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba, 3.Graduate School of Science and Technology, University of Tsukuba, 4.Univercity of Nagoya, 5.Tokyo University of Agriculture and Technology)