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Background and Aims <p>Nitrogen deposition is composed of inorganic and organic nitrogen, which may have different effects on ecosystem N<sub>2</sub>O emissions. In previous studies, nitrogen deposition has typically been simulated as a single form addition event. Therefore, in this study, we systematically assessed the possible bias of different forms of nitrogen deposition on grassland N<sub>2</sub>O emissions.</p> Methods <p>In this study, we investigated the effects of IN (inorganic nitrogen), ON (organic nitrogen), and MN (mixed nitrogen, inorganic nitrogen + organic nitrogen) additions on N<sub>2</sub>O emissions in a two-year N addition experiment using a typical saline-alkaline grassland. Parameters such as soil pH, aboveground vegetation biomass, soil inorganic N concentration, and soil organic carbon content were measured to investigate the potential mechanisms through which N addition leads to different N<sub>2</sub>O emissions.</p> Results <p>The results of this study revealed that nitrogen addition increased N<sub>2</sub>O emission fluxes and cumulative emissions. The ON form of nitrogen addition significantly increased cumulative N<sub>2</sub>O emissions. Random Forest results showed that soil pH was the strongest predictor of N<sub>2</sub>O emissions. Furthermore, SEM results further showed that soil pH had a significant positive effect on N<sub>2</sub>O emissions, which implies that the addition of nitrogen impacts N<sub>2</sub>O emissions through soil acidification.</p> Conclusion <p>Overall, our results suggest that the effect of nitrogen deposition on N<sub>2</sub>O emissions may be underestimated if only IN is added and may be overestimated if only ON is added.</p>

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Potential bias of nitrogen deposition effects on nitrous oxide emissions from saline-alkaline grasslands

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Guorong Xu,
  • Shuaijun Wang,
  • Shuainan Liu,
  • Jianyu Yuan,
  • Jiangqi Wu,
  • Weiwei Ma,
  • Guang Li

摘要

Background and Aims

Nitrogen deposition is composed of inorganic and organic nitrogen, which may have different effects on ecosystem N2O emissions. In previous studies, nitrogen deposition has typically been simulated as a single form addition event. Therefore, in this study, we systematically assessed the possible bias of different forms of nitrogen deposition on grassland N2O emissions.

Methods

In this study, we investigated the effects of IN (inorganic nitrogen), ON (organic nitrogen), and MN (mixed nitrogen, inorganic nitrogen + organic nitrogen) additions on N2O emissions in a two-year N addition experiment using a typical saline-alkaline grassland. Parameters such as soil pH, aboveground vegetation biomass, soil inorganic N concentration, and soil organic carbon content were measured to investigate the potential mechanisms through which N addition leads to different N2O emissions.

Results

The results of this study revealed that nitrogen addition increased N2O emission fluxes and cumulative emissions. The ON form of nitrogen addition significantly increased cumulative N2O emissions. Random Forest results showed that soil pH was the strongest predictor of N2O emissions. Furthermore, SEM results further showed that soil pH had a significant positive effect on N2O emissions, which implies that the addition of nitrogen impacts N2O emissions through soil acidification.

Conclusion

Overall, our results suggest that the effect of nitrogen deposition on N2O emissions may be underestimated if only IN is added and may be overestimated if only ON is added.