Stimulation of ammonia oxidizer and denitrifier abundances by nitrogen loading : Poor predictability for increased soil N2 O emission

Bibliographische Detailangaben
Veröffentlicht in:	Global change biology. - 1999. - 28(2022), 6 vom: 15. März, Seite 2158-2168
1. Verfasser:	Zhang, Yong (VerfasserIn)
Weitere Verfasser:	Zhang, Feng, Abalos, Diego, Luo, Yiqi, Hui, Dafeng, Hungate, Bruce A, García-Palacios, Pablo, Kuzyakov, Yakov, Olesen, Jørgen Eivind, Jørgensen, Uffe, Chen, Ji
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2022
Zugriff auf das übergeordnete Werk:	Global change biology
Schlagworte:	Journal Article biological and chemical processes denitrification microbial gene abundance nitrification nitrogen addition nitrous oxide precipitation soil pH Soil mehr... Ammonia 7664-41-7 Nitrous Oxide K50XQU1029 Nitrogen N762921K75

Beschreibung
Zusammenfassung:	© 2021 The Authors. Global Change Biology published by John Wiley & Sons Ltd. Unprecedented nitrogen (N) inputs into terrestrial ecosystems have profoundly altered soil N cycling. Ammonia oxidizers and denitrifiers are the main producers of nitrous oxide (N2 O), 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 N2 O 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 N2 O emission by 261%, whereas there was no clear relationship between changes in soil N2 O 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 N2 O emission. Instead, key abiotic factors (mean annual precipitation, soil pH, soil C:N ratio, and ecosystem type) explained N-induced changes in soil N2 O 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 N2 O emission
Beschreibung:	Date Completed 24.02.2022 Date Revised 31.07.2022 published: Print-Electronic Citation Status MEDLINE
ISSN:	1365-2486
DOI:	10.1111/gcb.16042