Generally Reduced Sink Capacity of Upland Soils for Atmospheric Methane Over the Past Three Decades (1993-2022)
© 2025 John Wiley & Sons Ltd.
| Veröffentlicht in: | Global change biology. - 1999. - 31(2025), 5 vom: 14. Mai, Seite e70248 |
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| Weitere Verfasser: | , , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
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| Zugriff auf das übergeordnete Werk: | Global change biology |
| Schlagworte: | Journal Article climate change emission or uptake methane mitigation upland soil Methane OP0UW79H66 Soil |
| Zusammenfassung: | © 2025 John Wiley & Sons Ltd. Upland soils act as the second largest and the only manageable sink of atmospheric methane (CH4). Quantifying spatiotemporal patterns of the net CH4 exchange between upland soils and atmosphere is critical for refining global CH4 budget estimates and developing climate mitigation strategies. However, the global CH4 budget in upland soils remains highly uncertain due to incomplete understanding of the shifts in the source or sink role of upland soils for CH4 under climate change. In this study, we generated high-resolution global maps of CH4 fluxes from upland soils by integrating field CH4 flux measurement data spanning over the period of 1993-2022 using machine learning models. Collectively, upland soils exhibited a generally reduced sink capacity for atmospheric methane over the past three decades. Cropping uplands presented a shift from a weak sink to a source, and grassland soils changed from a sink to a strong source of CH4. The sink capacity of forest soils for CH4 sharply decreased by 68.8% over the past three decades, while tundra upland soils acted as a consistent source of CH4, with a decrease of 55.3% since 1993. The combined effects of changes in precipitation and temperature can explain more than 70% of spatiotemporal variations of CH4 fluxes in upland soils. Our findings provide a new perspective on the spatiotemporal patterns of CH4 fluxes in global upland soils, which update the role of upland soils in the global CH4 budget, particularly as a potential CH4 sink |
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| Beschreibung: | Date Completed 14.05.2025 Date Revised 14.05.2025 published: Print Citation Status MEDLINE |
| ISSN: | 1365-2486 |
| DOI: | 10.1111/gcb.70248 |