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Distribution of radiocesium and its controlling factors under the Japanese cedar canopies by Hiroaki Kato; Yuichi Onda; Keita Maejima is a Environmental Science article available to read on EtoBox.

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This study investigated the spatial distribution of radiocesium deposited by the Fukushima Daiichi Nuclear Power Plant accident in a densely planted Japanese cedar stand. Systematic grid sampling was conducted to determine 137 Cs inventories in the layers of deposited organic material and mineral soil at two different spatial scales (hillslope [60 m 2 ] and small [1 m 2 ]). The results showed that 137 Cs inventories along the hillslope were heterogeneously distributed, with coefficients of variation for the deposited organic material and mineral soil layers of 46.4% and 48.9%, respectively. The 137 Cs inventory in each layer tended to show a lognormal distribution. The correlation between the 137 Cs inventories in deposited organic material and mineral soil in the same sampling grid was weak. The controlling mechanisms of the 137 Cs inventories in the litter and mineral soil layers differed due to differences in the underlying key processes, such as canopy-forest floor transfer due to hydrological and biological processes. No significant correlation was found between the distance from the nearest tree trunk and the 137 Cs inventory in the deposited organic layer at each sampling po

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Author

Hiroaki Kato; Yuichi Onda; Keita Maejima

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)