Soil GHG fluxes are altered by N deposition New data indicate lower N stimulation of the N2 O flux and greater stimulation of the calculated C pools

Soil GHG fluxes are altered by N deposition : New data indicate lower N stimulation of the N2 O flux and greater stimulation of the calculated C pools

© 2019 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 26(2020), 4 vom: 21. Apr., Seite 2613-2629
1. Verfasser: Deng, Lei (VerfasserIn)
Weitere Verfasser: Huang, Chunbo, Kim, Dong-Gill, Shangguan, Zhouping, Wang, Kaibo, Song, Xinzhang, Peng, Changhui
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article carbon sink global warming greenhouse gas emissions meta-analysis nitrogen enrichment soil
Beschreibung
Zusammenfassung:© 2019 John Wiley & Sons Ltd.
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 N2 O 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 N2 O 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
Beschreibung:Date Revised 01.02.2023
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1365-2486
DOI:10.1111/gcb.14970