Relationship between the riverine nitrate–nitrogen concentration and the land use in the Teshio River watershed, North Japan |
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Authors: | Nina Y Ileva Hideaki Shibata Fuyuki Satoh Kaichiro Sasa Hiroshi Ueda |
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Institution: | (1) Graduate School of Environmental Science, Hokkaido University, Kita 10 Nishi 5, Kita-ku Sapporo, 060-0810, Japan;(2) Field Science Center for Northern Biosphere, Hokkaido University, Kita 10 Nishi 5, Kita-ku Sapporo, 060-0810, Japan |
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Abstract: | The present research investigated the relationship between nitrate–nitrogen (NO3–N) in river water and the land use/land cover (hereafter, land use) in the Teshio River watershed located in northern Hokkaido
island to understand the effect of human activities such as agriculture, forestry, industry, and urbanization in the drainage
basin on the river ecosystem quality and services. River water was sampled at nine points seasonally during a 2-year period
and the nutrients concentration was measured. Land use profiles were estimated at two spatial scales, riparian and sub-catchment,
for each sampling station. The spatial pattern of water quality in the Teshio River showed increased NO3–N levels associated with agriculture and urban expansion, and forest reduction in the watershed. Land use at the riparian
scale closely reflected that at the sub-catchment scale, which masked the unique riparian buffer effect on the river water
condition. The increased agricultural and reduced forest area in the riparian zone, especially in the upper middle reach,
could be a possible reason for a decline of ecosystem service for the provisioning of clean water and habitat for aquatic
organisms. Measures towards sustainable and more nature-friendly agricultural management are necessary in the area to protect
the Teshio River ecosystem and its ecosystem services. |
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