Journal of Forest Research

, Volume 13, Issue 6, pp 380–385 | Cite as

The influence of topography on the stream N concentration in the Tanzawa Mountains, Southern Kanto District, Japan

  • Reiji Fujimaki
  • Akiyuki Kawasaki
  • Yoshikazu Fujii
  • Nobuhiro Kaneko
Short Communication


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.


Catchment topography Forest watershed Geographic information system (GIS) Nitrate Water quality 



We are grateful to Makoto Arima, Eiko Nakamura, Keiich Ohno, Masamichi T. Ito, Masahiro Ishikawa, Yoshiyuki Kaneko, and Akiko Sakai at Yokohama National University for their assistance. This study was supported financially by the 21st Century COE Program of Japan Society for the Promotion of Sciences, a scientific research fund of Ministry of Education, Culture, Sports, Science and Technology (No. 18710035), and a fund for Enhancement of Education and Research in Yokohama National University.

Supplementary material

10310_2008_89_MOESM1_ESM.tif (2.7 mb)
Supplementary figure 1. Variation of total N concentration of stream water among the catchments in the Tanzawa Mountains. (TIF 2.65 MB)


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Copyright information

© The Japanese Forest Society and Springer 2008

Authors and Affiliations

  • Reiji Fujimaki
    • 1
  • Akiyuki Kawasaki
    • 1
  • Yoshikazu Fujii
    • 1
  • Nobuhiro Kaneko
    • 1
  1. 1.Graduate School of Environment and Information SciencesYokohama National UniversityYokohamaJapan

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