Evaluating stream water quality through land use analysis in two grassland catchments: impact of wetlands on stream nitrogen concentration

Journal of Environmental Quality
Atsushi HayakawaRyusuke Hatano

Abstract

We evaluated the impacts of natural wetlands and various land uses on stream nitrogen concentration in two grassland-dominated catchments in eastern Hokkaido, Japan. Analyzing land use types in drainage basins, measuring denitrification potential of its soil, and water sampling in all seasons of 2003 were performed. Results showed a highly significant positive correlation between the concentration of stream NO3-N and the proportion of upland area in drainage basins in both catchments. The regression slope, which we assumed to reflect the impact on water quality, was 24% lower for the Akkeshi catchment (0.012 +/- 0.001) than for the Shibetsu catchment (0.016 +/- 0.001). In the Akkeshi catchment, there was a significant negative correlation between the proportion of wetlands in the drainage basins and stream NO3-N concentration. Stream dissolved organic nitrogen (DON) and carbon (DOC) concentrations were significantly higher in the Akkeshi catchment. Upland and urban land uses were strongly linked to increases in in-stream N concentrations in both catchments, whereas wetlands and forests tended to mitigate water quality degradation. The denitrification potential of the soils was highest in wetlands, medium in riparian forests, an...Continue Reading

References

Mar 3, 2001·The Science of the Total Environment·P J ChapmanM S Cresser
Feb 18, 2004·Journal of Environmental Quality·V B WillettD L Jones
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Jul 21, 2004·The Science of the Total Environment·Krishna Prasad WoliRyusuke Hatano

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Citations

May 16, 2007·Environmental Monitoring and Assessment·Krishna Prasad WoliRyusuke Hatano
Feb 19, 2016·Environmental Monitoring and Assessment·Agnieszka Ewa LawniczakKrzysztof Kanas
Apr 1, 2008·Environmental Pollution·M Alvarez-CobelasS Sánchez-Carrillo
Jan 10, 2009·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Guang JinJames W Webb
Mar 13, 2009·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Mara GennariCarlotta Boursier
Apr 16, 2021·Environmental Science and Pollution Research International·Lifei WangJian Liu
Jun 2, 2021·Environmental Science & Technology· Jiajia LinJohn L Stoddard

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