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The total amounts of radioactively contaminated materials in forests in Fukushima, Japan
Shoji Hashimoto, Shin Ugawa, Kazuki Nanko & Koji Shichi The spatial distributions of forest and soil types are shown in Figure 1 and Table 1. The total extent of forest in the area that we defined as heavily contaminated (≥ 134, 137Cs 1000 kBq m−2) was 428 km2, 66% of the area (646 km2), 4% of the forests in Fukushima prefecture, 0.17% of Japan's forests, and 0.11% of Japan's total area. The dominant forest types were deciduous broadleaf forests and evergreen needleleaf forests. The deciduous broadleaf forests were more distributed in the northern part of the region, and the evergreen needleleaf forests were more distributed in the southern part. There was an additional small area of deciduous needleleaf forests. Brown forest soils (Cambisols and Andosols in the classification of the Food and Agriculture Organization), the most widely distributed soil type in Japan, were distributed most widely in this area, and Black soil (Andosols) and Immature soil (Regosols, Arenosols, Fluvisols, and Leptosols) were also found. The Black soil was distributed in the northern part of the region, and Immature soils were found in the southern part.http://www.nature.com/srep/2012/120525/srep00416/full/srep00416.html