Characteristic of dissolved radiocesium leaching from a forest litter observed from litterbag experiment

Sakuma, Kazuyuki; Yoshimura, Kazuya

no journal, , 

We investigated characteristic of dissolved Cs leaching from litters collected at a coniferous needle and a deciduous broadleaf forests using litterbags at upstream area of Ota River in Fukushima. Each leaf type of litters was collected into 24 litterbags, respectively, and installed each forest floor in June, 2017. Triplicate samples were collected at each forest floor and readily transported to laboratory in August and December, 2017. Samples were put in buckets and soaked in purified water immediately after back to laboratory. We took leaching water samples from the buckets at 20 min., 2 hours, 24 hours after soaking litter samples in the water. These samples were analysed about Cs activity, dissolved organic carbon concentration, and major ions concentration etc. The main results are that the deciduous broadleaf litter showed much higher leaching ratio of dissolved Cs (Summar:8.32.6%, Winter:6.80.9%) than that of the coniferous needle litter (Summar:1.80.2%, Winter:1.20.4%) after soaking during 24 hours.