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Articles | Volume 20, issue 3
Articles | Volume 20, issue 3
https://doi.org/10.5194/bg-20-753-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-753-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 20, issue 3
Research article
 | 
16 Feb 2023
Research article |  | 16 Feb 2023

Stable isotopic evidence for the excess leaching of unprocessed atmospheric nitrate from forested catchments under high nitrogen saturation

Weitian Ding, Urumu Tsunogai, Fumiko Nakagawa, Takashi Sambuichi, Masaaki Chiwa, Tamao Kasahara, and Ken'ichi Shinozuka

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Cited articles

Aber, J. D.: Nitrogen cycling and nitrogen saturation in temperate forest ecosystems, Trends Ecol. Evol., 7, 220–224, https://doi.org/10.1016/0169-5347(92)90048-G, 1992. 
Aber, J. D., Nadelhoffer, K. J., Steudler, P., and Melillo, J. M.: Nitrogen Saturation in Northern Forest Ecosystems, Bioscience, 39, 378–386, https://doi.org/10.2307/1311067, 1989. 
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, https://doi.org/10.1016/S1352-2310(03)00214-0, 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. 
Asano, Y., Uchida, T., and Ohte, N.: Residence times and flow paths of water in steep unchannelled catchments, Tanakami, Japan, J. Hydrol., 261, 173–192, https://doi.org/10.1016/S0022-1694(02)00005-7, 2002. 
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By monitoring the concentration and Δ17O of stream nitrate in three forested streams, the new nitrogen saturation index of forested catchments (Matm/Datm ratio) was estimated. We found that (1) the unprocessed atmospheric nitrate in our studied forested stream (FK1 catchment) was the highest ever reported in forested streams; (2) the Matm/Datm ratio can be used as a robust index for evaluating nitrogen saturation in forested catchments as the Matm/Datm ratio is independent of the precipitation.
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