| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Outline of Final Research Achievements |
To estimate nutrient spiralling metrics in a large river, we monitored the longitudinal profiles of inorganic nutrient concentrations in the mainstem of Fuji River by tracking a specific water parcel directly along the river course. The in situ tracking of a water parcel revealed that the areal uptake rates of NH4 and PO4 were much higher than those reported in previous studies. Moreover, negative fluxes of both NO2 and NO3 from riverbeds were observed. However, nutrient removal efficiency, expressed as uptake velocity (vf) and uptake length (Sw), of NH4 and PO4 did not differ from or was even low relative to previous findings, as a result of the high nutrient concentration and high water velocity in the Fuji River. The results suggest that anthropogenic nutrients are propagated through fast-flowing river corridors in a short period of time and eventually highly influential on distant downstream ecosystems.
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