Shifts in soil ammonia-oxidizing community maintain the nitrogen stimulation of nitrification across climatic conditions.
Glob Chang Biol
; 30(1): e16989, 2024 Jan.
Article
em En
| MEDLINE
| ID: mdl-37888833
ABSTRACT
Anthropogenic nitrogen (N) loading alters soil ammonia-oxidizing archaea (AOA) and bacteria (AOB) abundances, likely leading to substantial changes in soil nitrification. However, the factors and mechanisms determining the responses of soil AOAAOB and nitrification to N loading are still unclear, making it difficult to predict future changes in soil nitrification. Herein, we synthesize 68 field studies around the world to evaluate the impacts of N loading on soil ammonia oxidizers and nitrification. Across a wide range of biotic and abiotic factors, climate is the most important driver of the responses of AOAAOB to N loading. Climate does not directly affect the N-stimulation of nitrification, but does so via climate-related shifts in AOAAOB. Specifically, climate modulates the responses of AOAAOB to N loading by affecting soil pH, N-availability and moisture. AOB play a dominant role in affecting nitrification in dry climates, while the impacts from AOA can exceed AOB in humid climates. Together, these results suggest that climate-related shifts in soil ammonia-oxidizing community maintain the N-stimulation of nitrification, highlighting the importance of microbial community composition in mediating the responses of the soil N cycle to N loading.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2024
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Article