Abstract
Japan’s rapid urbanisation over the last 50 years has resulted in land use and lifestyle changes, all of which are likely to have changed the quality of river water, and consequently the wetland and coastal environment. We examined changes in river water quality over this period by means of a review of previous studies. Around the 1950s, the weighted average of chloride using discharge of Japan’s 30 major rivers was 6.1 mg/l while in the 2000s it was 11.3 mg/l. Because there were no significant changes in the natural conditions, we have attributed the increase to the urbanisation of the last 50 years. Nitrate levels in the mountain streams of southern Japan have increased, particularly in the western part of the Kanto region. As this area is located on the leeward side of the Tokyo Metropolitan Area, depositions from aerosols are thought to be the main cause of the increased nitrate concentration. These two findings suggest that certain uses of land may affect river water quality differently over time, and that changes in land use may also affect river water quality in remote areas.
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We wish to thank Dr. Keiko Tagami and her colleagues for their valuable information on monitoring the data of river water chemistry.
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Tabayashi, Y., Yamamuro, M. Changes in the impact of anthropogenic effects on river water quality during the last 50 years in Japan. Wetlands Ecol Manage 17, 409–415 (2009). https://doi.org/10.1007/s11273-008-9117-3
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DOI: https://doi.org/10.1007/s11273-008-9117-3