LONG-TERM DYNAMICS OF CAESIUM IN FOREST
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1 Oct 1, 213 JAEA Caesium workshop 1 LONG-TERM DYNAMICS OF CAESIUM IN FOREST Masamichi Takahashi, Masahiro Kobayashi, Takuya Kajimoto, Shoji Hashimoto FORESTY AND FOREST PRODUCTS RESEACH INSTITUTE Oct 1, 213 JAEA Caesium workshop 2 Problems involved in Fukushima contaminated forests 25km Safety of timber and wood products Effects of radio Cs on multifunctional uses of forests Wide distribution of contaminated area in northern Kanto plain Cs dynamic in the forest ecosystem Modeling of Cs dynamics and wide area estimation of Cs distribution in east Japan.
2 Oct 1, 213 JAEA Caesium workshop 3 Study strategy for the forests in Fukushima: comparison among Sugi forests with different contamination levels Timber production in Fukushima (1 3 m3) Sugi Pines Hinoki Larch Others Fukushima is a timber production prefecture of the 7 th place in Japan. Oaks Tadami FDNPP Kawauchi Oct 1, 213 JAEA Caesium workshop 4 Study strategy: comparison among tree species and annual changes Tree species: 3D structure of forest ecosystem Oaks and deciduous broadleaved forest Red pine forest Contamination level Sugi forest Sugi forest Sugi forest Low contamination, West Mid contamination, Central High contamination, East Time (year)
3 Oct 1, 213 JAEA Caesium workshop 5 Methods: Study sites and sampling methods Litter and soil Trees Plots Kawauchi.16ha (28m).24ha (38m) Tadami.21ha (37m) 1 Ex. Pine forest at Air dose rate (on the grids, 1cm and 1m) Litter (25x25cm) and soil (core sampling) surface soil (-5cm) deeper soils (-2cm) Oct 1, 213 JAEA Caesium workshop 6 Photos in the field, and separation of heartwood and sapwood for Cs analysis Measurement of air dose rate Soil sampling Analysis by germanium semiconductor detector Cutting a tree Sampling of wood after peeling of bark
4 Oct 1, 213 JAEA Caesium workshop 7 Comparison of the air dose rates in the plots between 211 and 5 Height: 1cm above 1cm the forest floor 4 Height: 1m above 1m the forest floor Sv/hr Sv/hr Sugi Pine Oak Sugi Sugi Tadami Kawauchi /211 11% 93% 91% 92% 111% Sugi Pine Oak Sugi Sugi Tadami Kawauchi /211 14% 9% 91% 93% 97% The air dose rates in were expected to decrease to 79% of the rate in 211 according to the decays of Cs-134 and Cs-137 but the decreases were relatively lower than expected. Oct 1, 213 JAEA Caesium workshop 8 The concentration of Cs Cs-137 in different parts of tree organs and soil layers: comparison among the plots with different contamination levels. Tadami.1Sv/h.3Sv/h Kawauchi 3.Sv/h Cs (kbq/kg) Cs-134+Cs-137 Cs (kbq/kg) Leaves Branches and twigs Bark Sapwood Heartwood Litter layer Soil layer -5cm Soil layer 5-1cm cm 5-1cm Soil layer 1-15cm 1-15cm.6 Soil layer 15-2cm 15-2cm.5
5 Oct 1, 213 JAEA Caesium workshop 9 The concentration of Cs Cs-137 in different parts of tree organs and soil layers : comparison among different tree species. Sugi Pine Oak Cs (kbq/kg) Leaves Branches and twigs Bark Sapwood Heartwood Litter layer -5cm Soil layer -5 cm 5-1cm Soil layer 5-1 cm cm 5-1cm cm 5-1cm cm Soil layer 1-15 cm cm cm cm Soil layer 15-2 cm cm cm Oct 1, 213 JAEA Caesium workshop 1 Deposition of radioactive Cs in the components of Sugi forests kbq/kg kbq/m 2 1,4 1,2 1, Concentration BiomassDeposition 17 kbq/m 2 14kBq/m 2 Total deposition:1227 kbq/m 2 72% 23% Tadami Kawauchi Leaves Branches and twigs Bark Wood Litter layer Soil layer -5cm Soil layer 5-2 cm
6 Oct 1, 213 JAEA Caesium workshop 11 Deposition of radioactive Cs in the components of forests with different species kbq/m Sugi kbq/m2 kbq/m2 Pine Oak Leaves Branches and twigs Bark Wood Litter layer cm Soil layer -5 cm Soil layer 5-2 cm 5-2 cm Oct 1, 213 JAEA Caesium workshop 12 Relationship between air dose rate and radio caesium concentration 1,, 1, Radio Cs (Bq/kg) 1, 1, Leaves Leaves 211 Bark Bark 211 Wood 1,, 1, Radio Cs (Bq/kg) 1, 1, Litter Litter 211 Soil Soil 1 Wood Air dose rate (Sv/h) Air dose rate (Sv/h)
7 Oct 1, 213 JAEA Caesium workshop 13 Cs cycling and dynamics in a sugi and ork forests in Koriyama. Radio Cs in 211 Coniferous forest (Sugi-hinoki) Throughfall Litter fall Litter layer (Organic layer) Litter decomposition Percolate water through litter layers Broadleaved forest (Oak) Depth 3cm Permeable water in the soil layers Oct 1, 213 JAEA Caesium workshop 14 Concentration of radioactive Cs in throughfall and percolate waters of litter and soil layers. Cs Cs-137 concentration Coniferous forest Throughfall Litter percolate water After filtration with glassfilter, radio Cs concentrations were <3Bq/L Throughfall (mm) Cs Cs-137 concentration Broadleaved forest Throughfall Litter percolate water After filtration with glassfilter, radio Cs concentrations was <5Bq/L Throughfall (mm) No radioactive Cs was detected in the water collected from 3 cm depth in the soil (detection limit: Bq L -1 No radioactive Cs was detected in the water collected from 3 cm depth in the soil (detection limit: Bq L -1
8 Oct 1, 213 JAEA Caesium workshop 15 Spatio-temporal dynamics of radio Cs in the forests contaminated Tree external Litter Tree internal Surface organic soil 137 Cs 134 Cs 137 Cs 134 Cs RIFE1 model soil Mineral Predicted spatio-temporal dynamics of radiocesium deposited onto forests following the Fukushima nuclear accident SCIENTIFIC REPORTS 3 : 2564 DOI: 1.138/srep2564 Oct 1, 213 JAEA Caesium workshop 16 Session 77: Radioactive contamination in forest ecosystems and safe uses of forest products Thank you for your attention!
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