Publications by authors named "Shin-Ichiro Mishima"
Nitrogen (N) is an essential nutrient but may become a pollution source in the environment when the N concentration exceeds a certain threshold for humans and nature. Nitrate is a major N species in river water with notable spatial and temporal variations under the influences of natural factors and anthropogenic N inputs. We analyzed the relationship between riverine N (focusing on nitrate) concentration and various factors (land use, climate, basin topography, atmospheric N deposition, agricultural N sources and human-derived N) in 104 rivers located throughout the Japanese Archipelago except small remote islands.
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- Nitrogen management is crucial for balancing energy and food production with the risks of environmental pollution caused by excess reactive nitrogen (N).
- The N footprint measures the amount of reactive N losses associated with food and energy production, showing significant variability across countries (15 to 47 kg N per person per year) mainly due to differences in protein consumption and food production waste.
- Strategies to reduce the N footprint include enhancing N use efficiency, recycling, minimizing food waste, and altering dietary choices, while there are still knowledge gaps regarding its impact from non-food goods and soil processes.