Rohdof Lactem Yengeh, Hiroaki Somura, Toshitsugu Moroizumi, Yasushi Mori, Morihiro Maeda
Received 30 May, 2024
Accepted 2 September, 2024
Published online 6 March, 2025

Rohdof Lactem Yengeh¹⁾, Hiroaki Somura¹⁾, Toshitsugu Moroizumi¹⁾, Yasushi Mori¹⁾, Morihiro Maeda¹⁾

1) Graduate School of Environmental and Life Science, Okayama University, Japan

Iron is essential for biogeochemical processes in aquatic ecosystems, but its riverine concentration can be affected by environmental conditions. This study assessed weekly fulvic acid iron (FAFe) concentration at a single sampling site in Asahi River from 2022–2023 to explore the differences in the temporal scales. The objectives of this study were to evaluate the effects of physicochemical properties of the river on the concentration of FAFe, analyze the concentration of FAFe in spring, summer, autumn and winter, and assess the relationship between FAFe concentration and land use types of the watershed. The results indicated that physicochemical parameters, such as pH and surface water temperature (SWT) seemed to influence FAFe concentration (p < 0.05). Hydrological dynamics influenced FAFe concentration and transport, revealing an increasing trend during spring (p < 0.001) and summer (p = 0.05), with non-significant trends during autumn and winter (p > 0.05). FAFe exhibited a strong positive correlation with total organic carbon (TOC) (p < 0.001). Upland fields significantly influenced FAFe concentration (p < 0.01) through runoff with abundant NO₃^– and PO₄^3– into the river. Thus, FAFe concentration in Asahi River was influenced by pH, SWT, TOC, hydrological regime, and agricultural runoff.

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