Articles | Volume 21, issue 21
https://doi.org/10.5194/bg-21-4717-2024
https://doi.org/10.5194/bg-21-4717-2024
Research article
 | 
01 Nov 2024
Research article |  | 01 Nov 2024

Bias in calculating gross nitrification rates in forested catchments using the triple oxygen isotopic composition (Δ17O) of stream nitrate

Weitian Ding, Urumu Tsunogai, and Fumiko Nakagawa

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Cited articles

Bengtsson, G., Bengtson, P., and Månsson, K. F.: Gross nitrogen mineralization-, immobilization-, and nitrification rates as a function of soil C/N ratio and microbial activity, Soil Biol. Biochem., 35, 143–154, https://doi.org/10.1016/S0038-0717(02)00248-1, 2003. 
Callesen, I., Raulund-Rasmussen, K., Gundersen, P., and Stryhn, H.: Nitrate concentrations in soil solutions below Danish forests, Forest Ecol. Manag., 114, 71–82, https://doi.org/10.1016/S0378-1127(98)00382-X, 1999. 
Christiansen, J. R., Elberling, B., and Jansson, P.-E.: Modelling water balance and nitrate leaching in temperate Norway spruce and beech forests located on the same soil type with the CoupModel, Forest Ecol. Manag., 237, 545–556, https://doi.org/10.1016/j.foreco.2006.09.090, 2006. 
Ding, W., Tsunogai, U., Nakagawa, F., Sambuichi, T., Sase, H., Morohashi, M., and Yotsuyanagi, H.: Tracing the source of nitrate in a forested stream showing elevated concentrations during storm events, Biogeosciences, 19, 3247–3261, https://doi.org/10.5194/bg-19-3247-2022, 2022. 
Ding, W., Tsunogai, U., Nakagawa, F., Sambuichi, T., Chiwa, M., Kasahara, T., and Shinozuka, K.: Stable isotopic evidence for the excess leaching of unprocessed atmospheric nitrate from forested catchments under high nitrogen saturation, Biogeosciences, 20, 753–766, https://doi.org/10.5194/bg-20-753-2023, 2023. 
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Short summary
Past studies have used the Δ17O of stream nitrate to estimate the gross nitrification rates (GNRs) in each forested catchment by approximating the Δ17O value of soil nitrate to be equal to that of stream nitrate. Based on inference and calculation of measured data, we found that this approximation resulted in an overestimated GNR. Therefore, it is essential to clarify and verify the Δ17O NO3 values in forested soils and streams before applying the Δ17O values of stream NO3 to GNR estimation.
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