Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS14] Biogeochemistry

Wed. May 23, 2018 9:00 AM - 10:30 AM 101 (1F International Conference Hall, Makuhari Messe)

convener:Keisuke Koba(Center for Ecological Research, Kyoto University), Hideaki Shibata(Field Science Center fot Northern Biosphere, Hokkaido University), Naohiko Ohkouchi(海洋研究開発機構, 共同), Youhei Yamashita(Faculty of Environmental Earth Science, Hokkaido University), Chairperson:Yamashita Yohei, Iwata Tomoya, Ohkouchi Naohiko

10:15 AM - 10:30 AM

[MIS14-06] Development and application of forest 137Cs cycling model "FoRothCs"

*Kazuya Nishina1, Shoji Hashimoto2, Shinji Kaneko2, Masabumi Komatsu2, Shinta Ohashi2, Naohiro Imamura2, Seiji Hayashi1 (1.NIES, 2.FFPRI)

Keywords:137Cs cycling, plantation forest

Following the Fukushima Dai-ichi nuclear power plant (FNDPP) accident in March 2011, 14.5 PBq of 137Cs were released into the atmosphere and deposited onto surrounding terrestrial ecosystems and largely on forest ecosystems. The big difference in the contaminated forest between FNDPP and Chernobyl is that the most contaminated forest is in Fukushima consisted of plantation forests for timber production. Because of the physical decay constant of 137Cs (30.1 year-1), the fate of 137Cs is important for long-term management of these forests. So, we have developed forest Roth-C and Cs cycling model "FoRothCs" to predict the redistribution of 137Cs in forest ecosystem especially for plantation forest in decadal timescale. This model can simulate 137Cs inventory and concentrations and activities of 7 compartments of a forest ecosystem (see Figure: diagonal components are the compartments and other components are transfer processes of FoRothCs) with biomass production (including stem volume of a tree). In this study, we will introduce "FoRothCs" and the application to 6-years monitoring data in 4 forest sites in Fukushima with different amount of 137Cs deposition. To reconcile FoRothCs outputs to these observations and estimate parameters regarding 137Cs transfer processes, we used an approximate Bayesian computation.