Redistribution of the soil <sup>137</sup> Cs inventory through litter and sediment transport on a hillslope covered by deciduous forest in Fukushima, Japan
Redistribution of the soil <sup>137</sup> Cs inventory through litter and sediment transport on a hillslope covered by deciduous forest in Fukushima, Japan
复制标题
日本福岛落叶林覆盖的山坡上的凋落物和沉积物迁移导致土壤<sup>137</sup>铯库存量的重新分配
DOI：
10.1002/esp.5393
复制
发表时间：
2022
影响因子：
3.3
通讯作者：
Ohte Nobuhito
中科院分区：
文献类型：
--
作者：
Oda Tomoki;Hotta Norifumi;Miura Satoru;Endo Izuki;Tanoi Keitaro;Renschler Chris S.;Ohte Nobuhito
在福岛第一核电站事故后，森林生态系统中放射性铯（137 Cs）活度浓度的长期行为及其下游影响仍然是日本福岛落叶阔叶林的重要问题。研究137 Cs在森林生态系统中的循环和排放规律，必须了解137 Cs在森林生态系统中的储存和沿着坡迁移的空间动态。因此，我们观测了2016年和2017年日本福岛落叶林山坡137 Cs存量的空间分布以及137 Cs通过沉积物和枯落物的迁移，并使用质量平衡模型研究了137 Cs存量的空间分布是如何形成的。2017年，137 Cs活度浓度在下坡河岸区（455 kBq/m2）显著高于上坡山脊区（179 kBq/m2）。137Cs在枯落物和沉积物中的年迁移对137Cs存量的贡献小于0.5%，不能解释137Cs存量的空间变化。质量平衡模型结果表明，在2011年137Cs初始沉降均匀分布的情况下，高137Cs活性浓度的凋落叶的迁移是影响137Cs存量空间分布的主要因素。
The long‐term behaviour of radiocaesium (137Cs) activity concentrations in forest ecosystems and their downstream impacts remain important issues in the deciduous broadleaf forests of Fukushima, Japan following the Fukushima Daiichi Nuclear Power Plant accident. To predict137Cs cycling and discharge in the forest ecosystem, it is important to understand the spatial dynamics of the137Cs inventory and transport along hillslopes. Therefore, we observed the spatial distribution of the137Cs inventory and137Cs transport via sediment and litter of a deciduous forest hillslope in Fukushima, Japan in 2016 and 2017 and examined how the spatial distribution of137Cs inventory was formed using a mass balance model. In 2017, the137Cs activity concentration was significantly greater in the downslope riparian area (455 kBq/m2) than in the upslope ridge area (179 kBq/m2). Annual137Cs transport within litter and sediment contributed <0.5% to the current137Cs inventory and cannot explain the current spatial variation of137Cs inventory on the hillslope. The mass balance model results showed that if the initial137Cs deposition was distributed uniformly in 2011, the spatial distribution of the hillslope137Cs inventory was influenced mainly by the movement of leaf litter with a high137Cs activity concentration.