Abstract
Background and aims
Considering the global demands in sustaining agriculture, use of organic amendments is gradually increasing. An improved understanding of the biological process is essential to evaluate the performance of organic amendments on agro-ecosystem.
Methods
Soils subjected to different fertilization regimes were collected from a field experiment. Microbial community compositions are assessed with 16S and ITS rRNA gene sequencing and subsequent bioinformatics analysis. Microbial functions are characterized with the geometric mean of the assayed enzyme activities (GMea) and the microbial carbon-use efficiency:nitrogen-use efficiency ratio (CUE:NUE).
Results
Compared with the chemically fertilized soil, the GMea significantly increased in organically amended soils. In contrast, the CUE:NUE was highest in chemically treated soil. These changes of microbial functional indicators were associated with shifts in the bacterial and not the fungal community composition, despite the fact that both the bacterial and fungal community compositions were significantly affected by the fertilization regimes. The abundances of specific soil bacterial taxa, especially the genera Luteimonas and Gemmatimona, were enriched by organic amendments. Soil organic carbon emerged as the major determinant of the bacterial community composition.
Conclusions
Soil microbial activities and nutrient-use efficiencies were dramatically changed along with the alteration of bacterial community composition. Relatively greater abundance of Luteimonas and Gemmatimona taxa in soils might be useful indicators for soil amelioration. Our research could be helpful to provide better strategies for the maintenance of soil fertility.
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Acknowledgements
This work was supported by the National Basic Research Program of China (2015CB150500), the National Key Research and Development Program of China (2017YFD0200206) and the Special Fund for Agro-scientific Research in the Public Interest (20150312205).
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Guo, J., Liu, W., Zhu, C. et al. Bacterial rather than fungal community composition is associated with microbial activities and nutrient-use efficiencies in a paddy soil with short-term organic amendments. Plant Soil 424, 335–349 (2018). https://doi.org/10.1007/s11104-017-3547-8
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DOI: https://doi.org/10.1007/s11104-017-3547-8