The influence of topography on the stream N concentration in the Tanzawa Mountains, Southern Kanto District, Japan |
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| Authors: | Reiji Fujimaki Akiyuki Kawasaki Yoshikazu Fujii Nobuhiro Kaneko |
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| Institution: | (1) Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama Kanagawa, 240-8501, Japan |
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| Abstract: | The water chemistry of 51 headwater streams was studied in the Tanzawa Mountains, western fringe of Southern Kanto Plain,
Japan. The relationships to soil N processes and catchment topography were also evaluated using a geographic information system
with fine-scale map data. The average concentration of total dissolved N was 0.74 mg-N L−1, of which 95% consisted of NO3
−-N. Stream N concentrations were not different among bedrock geologies and among vegetations of the catchments. Stream NO3
−-N marginally correlated to soil nitrification. Stream NO3
−-N also tended to be high in areas with steep and south-facing slopes. These results imply that N transport from Tanzawa forest
ecosystems is related to hydrological and biological processes associated with catchment topography.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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| Keywords: | Catchment topography Forest watershed Geographic information system (GIS) Nitrate Water quality |
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