Articles | Volume 15, issue 22
https://doi.org/10.5194/bg-15-7025-2018
https://doi.org/10.5194/bg-15-7025-2018
Research article
 | 
22 Nov 2018
Research article |  | 22 Nov 2018

Export flux of unprocessed atmospheric nitrate from temperate forested catchments: a possible new index for nitrogen saturation

Fumiko Nakagawa, Urumu Tsunogai, Yusuke Obata, Kenta Ando, Naoyuki Yamashita, Tatsuyoshi Saito, Shigeki Uchiyama, Masayuki Morohashi, and Hiroyuki Sase

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Cited articles

Aber, J. D., Nadelhoffer, K. J., Steudler, P., and Melillo, J. M.: Nitrogen Saturation in Northern Forest Ecosystems, Bioscience, 39, 378–386, 1989. 
Aber, J. D., Goodale, C. L., Ollinger, S. V., Smith, M.-L., Magill, A. H., Martin, M. E., Hallett, R. A., and Stoddard, J. L.: Is nitrogen deposition altering the nitrogen status of northeastern forests?, Bioscience, 53, 375–389, 2003. 
Aikawa, M., Hiraki, T., Tamaki, M., and Shoga, M.: Difference between filtering-type bulk and wet-only data sets based on site classification, Atmos. Environ., 37, 2597–2603, 2003. 
Alexander, B., Hastings, M. G., Allman, D. J., Dachs, J., Thornton, J. A., and Kunasek, S. A.: Quantifying atmospheric nitrate formation pathways based on a global model of the oxygen isotopic composition (Δ17O) of atmospheric nitrate, Atmos. Chem. Phys., 9, 5043–5056, https://doi.org/10.5194/acp-9-5043-2009, 2009 
Berner, E. K. and Berner, R. A.: The global water cycle: geochemistry and environment, Englewood Cliffs, NJ, Prentice-Hall, 1987. 
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To clarify the biological processing of nitrate within temperate forested catchments using unprocessed atmospheric nitrate exported from each catchment as a tracer, we continuously monitored stream nitrate concentrations and stable isotopic compositions in three forested catchments for more than 2 years. We concluded that the export flux of unprocessed atmospheric nitrate relative to the deposition flux in each forest ecosystem is applicable as an index for nitrogen saturation.
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