Journal
GLOBAL CHANGE BIOLOGY
Volume 26, Issue 4, Pages 2613-2629Publisher
WILEY
DOI: 10.1111/gcb.14970
Keywords
carbon sink; global warming; greenhouse gas emissions; meta-analysis; nitrogen enrichment; soil
Funding
- Chinese Academy of Sciences [XDA23070201]
- National Natural Science Foundation of China [41730638, 41877538]
- Special Support Plan of Young Talents Project
- Natural Sciences and Engineering Research Council of Canada
- Promoting Plan to Creative Talents of 'Youth Science and Technology Star' [2018KJXX-088]
- MERITE Postdoc Scholarship Programme
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The effects of nitrogen (N) deposition on soil organic carbon (C) and greenhouse gas (GHG) emissions in terrestrial ecosystems are the main drivers affecting GHG budgets under global climate change. Although many studies have been conducted on this topic, we still have little understanding of how N deposition affects soil C pools and GHG budgets at the global scale. We synthesized a comprehensive dataset of 275 sites from multiple terrestrial ecosystems around the world and quantified the responses of the global soil C pool and GHG fluxes induced by N enrichment. The results showed that the soil organic C concentration and the soil CO2, CH4 and N2O emissions increased by an average of 3.7%, 0.3%, 24.3% and 91.3% under N enrichment, respectively, and that the soil CH4 uptake decreased by 6.0%. Furthermore, the percentage increase in N2O emissions (91.3%) was two times lower than that (215%) reported by Liu and Greaver (Ecology Letters, 2009, 12:1103-1117). There was also greater stimulation of soil C pools (15.70 kg C ha(-1) year(-1) per kg N ha(-1) year(-1)) than previously reported under N deposition globally. The global N deposition results showed that croplands were the largest GHG sources (calculated as CO2 equivalents), followed by wetlands. However, forests and grasslands were two important GHG sinks. Globally, N deposition increased the terrestrial soil C sink by 6.34 Pg CO2/year. It also increased net soil GHG emissions by 10.20 Pg CO2-Geq (CO2 equivalents)/year. Therefore, N deposition not only increased the size of the soil C pool but also increased global GHG emissions, as calculated by the global warming potential approach.
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