Current Status of Nitrogen Saturation in the Upper Reaches of the Kanna River, Japan
Nitrogen saturation has become one of the serious issues in the field of forest environment. The watershed protection forests located in the downwind hinterland of Tokyo Metropolitan Area are believed to be facing nitrogen saturation. In this study, we carefully focus on the balance of nitrogen between load and runoff. Annual nitrogen load via atmospheric deposition was estimated to 461.1 t-N/year in the upper reaches of the Kanna River. Annual nitrogen runoff to the forested headwater stream of the Kanna River was determined to 184.9 t-N/year, corresponding to 40.1% of the total nitrogen load. Clear seasonal change in NO3-N concentration was still observed. Therefore, watershed protection forest of the Kanna River is most likely to be in Stage-1 on the status of nitrogen saturation.
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 M. Yoh, E. Konohira, and K. Yagi, "Regional distribution of natural stream nitrate in central Japan,” Water Air Soil Pollut., vol. 130, pp. 655–660, 2001.
 Z. Zhang, T. Fukushima, P. Shi, F. Tao, Y. Onda, T. Gomi, S. Mizugaki, Y. Asano, K. Kosugi, S. Hiramatsu, H. Kitahara, K. Kuraji, T. Terajima, and K. Matsushige, "Seasonal changes of nitrate concentrations in baseflow headwaters of coniferous forest in Japan: A significant indicator for N saturation,” Catena, vol. 76, pp. 63–69, 2008.
 Z. Zhang, T. Fukushima, P. Shi, F. Tao, Y. Onda, T. Gomi, S. Mizugaki, Y. Asano, K. Kosugi, S. Hiramatsu, H. Kitahara, K. Kuraji, T. Terajima, and K. Matsuhige, "Baseflow concentrations of nitrogen and phosphorus in forested headwaters in Japan,”Sci. Tot. Environ., vol. 402, pp. 113–122, 2008.
 M. Watanabe, Newsletterof National Institute for Environmental Studies, vol. 27, Ibaraki, Tsukuba: National Institute for Environmental Studies, 2008, pp. 6–8.
 S. Yoshii, K. Sekiguchi, and A. Iijima, "Concentration of Nitrogen in a Forested Headwater Stream in Japan,” International Conference on Environmental, Biological and Ecological Sciences, and Engineering (ICEBESE) 2012
 M. Shimoda, H. Tago, K. Kumagai, Y. Saitoh, K. Kozawa, and A. Iijima. "Estimation of the effects of atmospheric nitrogen deposition on groundwater contamination in Gunma Prefecture,” J. Jpn. Soc. Atmos. Environ., vol. 46, pp. 209–216.
 K. Hasegawa and S. Kobatake, "Characteristics of nitrate concentration of headwater streams located in the northwest of Tokyo Metropolitan Area,”J. Jpn. For. Soc., vol. 88, pp. 534–540, 2006
 P. M. Vitousek and R.W. Howarth, "Nitrogen limitation on land and in the sea: How can it occur?”Biogeochemistry, vol. 13, pp. 87–115, 1991.
 H. Toda, "Outline of Nitrogen Pollution by Nitrogen Saturation in Nutrient Circulation of Terrestrial Ecosystems,” Journal of Resources and Environment, vol. 38, No. 11, pp. 1067-1072, 2002.
 G. K. Phoenix, W. K. Hicks, S. Cinderby, J. C. I. Kuylenstierna, W. D. Stock, F. J. Dentener, K. E. Giller, A. T. Austin, R. B. Lefroy, B. S. Gimeno, M. R. Ashmoress, and P. Ineson, "Atmospheric nitrogen deposition in the world biodiversity hotspots: the need for a greater global perspective in assessing N deposition impacts,”Global Change Biology, vol. 12, pp. 1–7, 2006.
 N. Tokuchi, N. Ohte, N. Usui, and K. Fukushima, "Consideration on N dynamics in template forest ecosystem under increasing N deposition,” The Ecological Society of Japan, 61,275-290(2011).
 J. N. Galloway, J. D. Aber, J. W. Erisman, S. P. Seitzinger, R. W. Howarth, E. B. Cowling, and B. J. Cosby, "The nitrogen cascade,” Bioscience, vol. 53, pp. 341–356, 2003.
 Environmental Laboratories Association, "Acid Deposition Survey in Japan, Phase 4(2006),” Journal of Environmental Laboratories Association, Vol. 32, No. 3, pp. 12,21,47(2007)
 Environmental Laboratories Association, "Acid Deposition Survey in Japan, Phase 4(2006),” Journal of Environmental Laboratories Association, Vol. 32, No. 4, pp. 64(2007)
 Wesely, M. L.: Parameterization of surface resistances to gaseous dry deposition In regional-scale numerical model. Atmospheric Environment, 23, 1293-1304, 1989.
 Global Environmental Issues Division of Ministry of the Environment, "Wet Deposition Monitoring Guide, Phase 2,” 2001.
 Erisman, J. W., Baldocchi, D. : Modeling dry deposition of SO2. Tellus, 46B, 159-171, 1994.
 Walcek, C. J., Brost, R. A., Chang, J. S., Wesely, M. L., : SO2, sulfate and HNO3 deposition velocities computed usingregional land use and meteorological data. Atmospheric Environment, 20, 949-964, 1986.
 Stoddard, L. J. (1994), "Long-Term Changes in Watershed Retention on Nitrogen,” Environmental Chemistry of Lake and Reservoirs, L. A. Baker(ed. ), Adv. Chem. Ser., 237, pp. 223-284
 Itadera K.: Estimation of evapotranspiration amount in Hakone Sengokubara district, Kanagawa Prefecture. Annu. Rep. of Hot Springs Res. Inst. of Kanagawa Pref., 37, 51-56, 2005.
 T. Hirata, K. Muraoka, "Effect of Element Cycle on Streamwater Chemistry in Forested Basin,” Japan Society of Civil Engineers symposium, vol. 399, pp. 131-140, 1988.
 Ohrui K, Mitchell MJ, "Nitrogen Saturation in Japanese Forested Watershed,” Ecological Applications, 7, pp. 391-401, 1997.
 K. Fukuzawa, H. Shibata, K. Takagi, M. Nomura, N. Kurima, T. Fukazawa, F. Sato, K. Sasa, "Effects of Clear-Cutting on Nitrogen Leaching and Fine Root Dynamics in a Cool-Temperate Forested Watershed in Northern Japan,” Forest Ecological Management, 225, pp. 257-261, 2006.
 Dise NB, Wright RF, "Nitrogen Reaching from European Forests in Relation to Nitrogen Deposition,” Forest Ecology and Management, 71, pp. 153-162, pp. 391-401, 1995.
 Vitousek, P.M. and Reiners, W.A. "Ecosystem Succession and Nutrient Retention,” a hypothesis, BioScience, 25, pp. 376-381, 1975.
 N. Koyanagi, H. Toda, T. Kuboi, K. Ikuhara, "Characteristics of Carbon and Nitrogen Dynamics in a Small Watershed of Aged Japanese Cedar and Cypress Stands in the Northern Kanto Region, Japan,” Journal of Japanese Forest Society, vol. 86, pp. 339-355, 2004.
 Annual Report on Environment in Japan and the press information of Ministry of the Environment, 2013.
 K. Kumagai, H. Tago, A. Iijima, K. Kozawa, and K. Sakamoto, "Chemical composition and seasonal characteristics of fine particles in the plain and mountain are of Gunma,” J. Jpn. Soc. Atmos. Environ., vol. 45, pp. 10–20.
 Annual Report on Environment in Gunma, 2012.