期刊
GLOBAL CHANGE BIOLOGY
卷 28, 期 6, 页码 2158-2168出版社
WILEY
DOI: 10.1111/gcb.16042
关键词
biological and chemical processes; denitrification; microbial gene abundance; nitrification; nitrogen addition; nitrous oxide; precipitation; soil pH
资金
- Natural Science Foundation of Anhui Province [2008085MC62]
- AHU [S020118002/101]
- NSFC-Yunnan United fund [U2102221]
- Aarhus Universitets Forskningsfond [AUFF-E-2019-7-1]
- H2020 Marie Sklodowska-Curie Actions [839806]
- Danish Independent Research Foundation [1127-00015B]
- Nordic Committee of Agriculture and Food Research
- US NSF [1919897, 2000058]
- Government Program of Competitive Growth of Kazan Federal University
- RUDN University Strategic Academic Leadership Program
- Division Of Environmental Biology
- Direct For Biological Sciences [2000058] Funding Source: National Science Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1919897] Funding Source: National Science Foundation
The study found that nitrogen loading significantly increased the abundance of ammonia oxidizers and denitrifiers in soil, but this did not directly correlate with changes in soil N2O emission. Abiotic factors such as mean annual precipitation, soil pH, soil C:N ratio, and ecosystem type were key in regulating nitrogen-induced changes in soil N2O emission.
Unprecedented nitrogen (N) inputs into terrestrial ecosystems have profoundly altered soil N cycling. Ammonia oxidizers and denitrifiers are the main producers of nitrous oxide (N2O), but it remains unclear how ammonia oxidizer and denitrifier abundances will respond to N loading and whether their responses can predict N-induced changes in soil N2O emission. By synthesizing 101 field studies worldwide, we showed that N loading significantly increased ammonia oxidizer abundance by 107% and denitrifier abundance by 45%. The increases in both ammonia oxidizer and denitrifier abundances were primarily explained by N loading form, and more specifically, organic N loading had stronger effects on their abundances than mineral N loading. Nitrogen loading increased soil N2O emission by 261%, whereas there was no clear relationship between changes in soil N2O emission and shifts in ammonia oxidizer and denitrifier abundances. Our field-based results challenge the laboratory-based hypothesis that increased ammonia oxidizer and denitrifier abundances by N loading would directly cause higher soil N2O emission. Instead, key abiotic factors (mean annual precipitation, soil pH, soil C:N ratio, and ecosystem type) explained N-induced changes in soil N2O emission. Altogether, these findings highlight the need for considering the roles of key abiotic factors in regulating soil N transformations under N loading to better understand the microbially mediated soil N2O emission.
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