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Evaluation of dissolved $$^{137}$$Cs discharge characteristics from a forested catchment of the Ohta River

Sakuma, Kazuyuki   ; Yoshimura, Kazuya  ; Nakanishi, Takahiro   ; Funaki, Hironori ; Tsuruta, Tadahiko  ; Ochi, Kotaro   ; Hayashi, Seiji*; Tsuji, Hideki*; Ozaki, Hirokazu*

Cesium-137 leaching from decomposing forest litter is thought to be one pathway by which dissolved $$^{137}$$Cs enters rivers from forests. To clarify whether this process contributes or not, we studied the correlation between humin-like matter from microorganism-induced plants decomposition and dissolved $$^{137}$$Cs concentrations. River water samples were collected approximately once a month from April 2017 to August 2019 at 10 locations (7 locations from April 2019) from the upstream of the Ohta River in the Namie and Minamisoma districts. These samples were filtered through 0.45-$$mu$$m-pore size membrane filters. The dissolved $$^{137}$$Cs concentrations and fluorescence intensities of humin-like matter were measured. A positive correlation was found between the fluorescence intensities of humin-like matter and normalized dissolved $$^{137}$$Cs concentration (R$$^{2}$$ = 0.17, p $$<$$ 0.001). The results indicate that $$^{137}$$Cs leaching from forest litter because of litter decomposition can contribute to increasing the dissolved $$^{137}$$Cs concentration in river water in forested catchments.

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