Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands.
Ecol Lett
; 23(5): 821-830, 2020 May.
Article
en En
| MEDLINE
| ID: mdl-32100414
ABSTRACT
Grassland ecosystems account for more than 10% of the global CH4 sink in soils. A 4-year field experiment found that addition of P alone did not affect CH4 uptake and experimental addition of N alone significantly suppressed CH4 uptake, whereas concurrent N and P additions suppressed CH4 uptake to a lesser degree. A meta-analysis including 382 data points in global grasslands corroborated these findings. Global extrapolation with an empirical modelling approach estimated that contemporary N addition suppresses CH4 sink in global grassland by 11.4% and concurrent N and P deposition alleviates this suppression to 5.8%. The P alleviation of N-suppressed CH4 sink is primarily attributed to substrate competition, defined as the competition between ammonium and CH4 for the methane mono-oxygenase enzyme. The N and P impacts on CH4 uptake indicate that projected increases in N and P depositions might substantially affect CH4 uptake and alter the global CH4 cycle.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Metano
/
Nitrógeno
Tipo de estudio:
Prognostic_studies
/
Systematic_reviews
Idioma:
En
Año:
2020
Tipo del documento:
Article