There has been leakage of radioactive materials from the Fukushima Daiichi Nuclear Power Plant. A heavily contaminated area (≥ 134, 137Cs 1000 kBq m−2) has been identified in the area northwest of the plant. The majority of the land in the contaminated area is forest. Here we report the amounts of biomass, litter (small organic matter on the surface of the soil), coarse woody litter, and soil in the contaminated forest area. The estimated overall volume and weight were 33 Mm3 (branches, leaves, litter, and coarse woody litter are not included) and 21 Tg (dry matter), respectively. Our results suggest that removing litter is an efficient method of decontamination. However, litter is being continuously decomposed, and contaminated leaves will continue to fall on the soil surface for several years; hence, the litter should be removed promptly but continuously before more radioactive elements are transferred into the soil.
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机译：福岛第一核电站的放射性物质泄漏。在该工厂西北部的一个严重污染的区域（≥ 134，137 Cs 1000 kBq m −2 ）已被确定。受污染地区的大部分土地是森林。在这里，我们报告了受污染的森林地区的生物量，垃圾（土壤表面的小有机物），木质垃圾和土壤的数量。估计的总体积和重量分别为33 Mm 3 （不包括树枝，树叶，凋落物和粗糙的木质凋落物）和21 Tg（干物质）。我们的结果表明，清除垃圾是一种有效的去污方法。但是，凋落物正在不断分解，受污染的叶子将在数年后继续掉落在土壤表面。因此，在将更多的放射性元素转移到土壤中之前，应及时但连续地清除垃圾。
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