Radiocesium migration in the litter layer of different forest types in Fukushima, Japan.

Autor: Kurihara M; National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan., Onda Y; Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 305-8577, Japan., Kato H; Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 305-8577, Japan., Loffredo N; Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 305-8577, Japan., Yasutaka T; National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan. Electronic address: t.yasutaka@aist.go.jp., Coppin F; Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SRTE, LR2T, Cadarache, France.
Jazyk: angličtina
Zdroj: Journal of environmental radioactivity [J Environ Radioact] 2018 Jul; Vol. 187, pp. 81-89. Date of Electronic Publication: 2018 Feb 07.
DOI: 10.1016/j.jenvrad.2018.01.027
Abstrakt: Cesium-137 ( 137 Cs) migration in the litter layer consists of various processes, such as input via throughfall, output via litter decomposition, and input from deeper layers via soil organism activity. We conducted litter bag experiments over 2 years (December 2014-November 2016) to quantify the inputs and outputs of 137 Cs in the litter layer in a Japanese cedar plantation (Cryptomeria japonica) and a mixed broadleaf forest dominated by Quercus serrata located 40 km northwest of the Fukushima Dai-ichi Nuclear Power Plant. The experiments included four conditions, combining contaminated and non-contaminated litter and deeper layer material, and the inputs and outputs were estimated from the combination of 137 Cs increases and decreases in the litter layer under each condition. The 137 Cs dynamics differed between the two forests. In the C. japonica forest, some 137 Cs input via throughfall remained in the litter layer, and downward 137 Cs flux passed through the litter layer was 0.42 (/year).Upward flux of 137 Cs from the deeper layer was very restricted, < 0.017 (/year). In the broadleaf forest, migration of 137 Cs in throughfall into deeper layers was restricted, downward 137 Cs flux was less than 0.003 (/year).Upward input of 137 Cs from the deeper layer was prominent, 0.037 (/year). 137 Cs output via litter decomposition was observed in both forests. The flux in the C. japonica forest was slower than that in the broadleaf forest, 0.12 and 0.15 (/year), respectively.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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