Abstract
Nitrogen (N) deposition can profoundly alter soil N transformation processes and the long-term productivity of forest ecosystems. The response of soil gross N transformations to N deposition in forest ecosystems has been well studied through simulated N addition experiments. Simulated N addition experiments are conducted under a wide range of background N deposition rates. However, it remains unclear whether the response of soil gross N transformation rates to simulated N addition is dependent on background N deposition rates. Here, we collate results from the literature in forest ecosystems, and found, for the first time, that the responses of gross rates of N mineralization, nitrification, and NO3− immobilization to experimental N addition changed from positive to negative with increasing background N deposition rates with the thresholds for such changes were 3.23, 6.02, 1.90 kg N ha− 1 yr− 1, respectively. Our results suggest that background N deposition rates shall be incorporated into ecosystem models to better predict forest ecosystem N cycling under future N deposition scenarios.
Change history
23 November 2020
In the initial online publication the figure legends for Figures 1 and 2 were reversed. The original article has been corrected.
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Acknowledgements
We thank the authors whose work was included in the analysis. This work was financially supported by the National Natural Science Foundation of China [grant numbers 41807093, 41977081, 41671231 and 41830642].
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YC and JBZ conceived the ideas and designed methodology; YC, JW, and HYHC collected and analyzed the data; YC, JBZ and HYHC wrote the first draft of the paper. ZCC, SXC, CYJ and GZW commented on the details of the manuscript drafts. All authors contributed critically to the drafts and gave final approval for publication.
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The original version of this article was revised: In the initial online publication the figure legends for Figures 1 and 2 were reversed. The original article has been corrected.
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Cheng, Y., Wang, J., Ge, Z. et al. Background nitrogen deposition controls the effects of experimental nitrogen addition on soil gross N transformations in forest ecosystems. Biogeochemistry 151, 335–341 (2020). https://doi.org/10.1007/s10533-020-00722-2
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DOI: https://doi.org/10.1007/s10533-020-00722-2