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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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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