Abstract
Aims
The release of the major greenhouse gas N2O from peatlands may be affected by current global change. We tried to answer how N2O emission from peatlands responds to phosphorus (P) addition and the co-addition of P and nitrogen (N).
Methods
We investigated the long-term (12 years) effects of N (50 and 100 kg ha−1 yr−1) and P (5 kg ha−1 yr−1) additions and their interaction on N2O fluxes in Hani peatland during the 2019 growing season.
Results
The addition of P, a low level of N or their co-addition had no effect on the source/sink function of N2O in the peatland. However, a high level of N addition turned the peatland into a sink of N2O with a cumulative flux of −164 ± 51 g m−2 during the growing season. This was probably due to the acceleration of plant litter decomposition, stimulation of hydrolase activity, and changes in the stoichiometric ratio of the peat soil. The co-addition of P and a high level of N turned the peatland into a source of N2O with a cumulative flux of 144 ± 54 g m−2 during the growing season by relieving nutrient limitation, accelerating the growth of vascular plants, and altering the litter input.
Conclusions
We suggest that the increase in nutrient availability caused by N deposition and agriculture fertilization can alter the N2O source/sink function of peatlands. These changes may have significant implications for the overall balance of greenhouse gas emissions and the role of peatlands in mitigating climate change.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This study was funded by the National Nature Science Foundation of China (Nos. U23A2003; 42371050 and 41471043) and Jilin Provincial Science and Technology Development Project (Nos. 20210402032GH and 20230203002SF). We thank dr. Tim Moore and three anonymous reviewers for their useful comments to our former version of manuscripts.
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This study was funded by the National Nature Science Foundation of China (Nos. U23A2003; 42371050 and 41471043) and Jilin Provincial Science and Technology Development Project (Nos. 20210402032GH and 20230203002SF).
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All authors contributed to the accomplishment of this work. Boli Yi: Methodology, Investigation, Formal analysis, Data curation, Software, Writing - original draft. Zhao-Jun Bu: Conceptualization, Methodology, Writing - review & editing, Funding acquisition, Project administration, Supervision, Validation. Fan Lu: Methodology, Investigation, Formal analysis, Software, Validation. Sebastian Sundberg: Methodology, Writing - review & editing. Jianghua Wu: Methodology, Writing - review & editing. Zicheng Yu: Methodology, Formal analysis, Writing - review & editing. Zhengfang Wu: Methodology, Writing - review & editing. Meng Wang: Formal analysis, Methodology, Writing - review & editing.
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Yi, B., Lu, F., Sundberg, S. et al. Effects of nitrogen and phosphorus additions on nitrous oxide fluxes in a peatland in NE China. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06569-y
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DOI: https://doi.org/10.1007/s11104-024-06569-y