Long‐term nitrogen fertilization decreases bacterial diversity and favors the growth of Actinobacteria and Proteobacteria in agro‐ecosystems across the globe.
In: Global Change Biology, Jg. 24 (2018-08-01), Heft 8, S. 3452-3461
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Abstract: Long‐term elevated nitrogen (N) input from anthropogenic sources may cause soil acidification and decrease crop yield, yet the response of the belowground microbial community to long‐term N input alone or in combination with phosphorus (P) and potassium (K) is poorly understood. We explored the effect of long‐term N and NPK fertilization on soil bacterial diversity and community composition using meta‐analysis of a global dataset. Nitrogen fertilization decreased soil pH, and increased soil organic carbon (C) and available N contents. Bacterial taxonomic diversity was decreased by N fertilization alone, but was increased by NPK fertilization. The effect of N fertilization on bacterial diversity varied with soil texture and water management, but was independent of crop type or N application rate. Changes in bacterial diversity were positively related to both soil pH and organic C content under N fertilization alone, but only to soil organic C under NPK fertilization. Microbial biomass C decreased with decreasing bacterial diversity under long‐term N fertilization. Nitrogen fertilization increased the relative abundance of Proteobacteria and Actinobacteria, but reduced the abundance of Acidobacteria, consistent with the general life history strategy theory for bacteria. The positive correlation between N application rate and the relative abundance of Actinobacteria indicates that increased N availability favored the growth of Actinobacteria. This first global analysis of long‐term N and NPK fertilization that differentially affects bacterial diversity and community composition provides a reference for nutrient management strategies for maintaining belowground microbial diversity in agro‐ecosystems worldwide. [ABSTRACT FROM AUTHOR]
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Long‐term nitrogen fertilization decreases bacterial diversity and favors the growth of Actinobacteria and Proteobacteria in agro‐ecosystems across the globe.
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Autor/in / Beteiligte Person: | Dai, Zhongmin ; Su, Weiqin ; Chen, Huaihai ; Barberán, Albert ; Zhao, Haochun ; Yu, Mengjie ; Yu, Lu ; Brookes, Philip C. ; Schadt, Christopher W. ; Chang, Scott X. ; Xu, Jianming |
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Zeitschrift: | Global Change Biology, Jg. 24 (2018-08-01), Heft 8, S. 3452-3461 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 1354-1013 (print) |
DOI: | 10.1111/gcb.14163 |
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