Abstract
Purpose
Biological nitrogen fixation greatly contributes to crop nitrogen nutrition in the agricultural ecosystem. However, with the inevitable and increasing releases of nanoparticles, the responses of soil diazotrophs (nitrogen-fixing microbes) are still unclear. This study aimed to figure out the effects of nanoparticles on the soil diazotrophic community and the underlying assembly mechanisms in the maize rhizosphere.
Materials and methods
In this study, we investigated the effects of copper oxide nanoparticles (CuONPs) on the diazotrophic activity, abundance, community diversity, and composition of the maize rhizosphere by performing a pot experiment. We also proposed the ecological co-occurrence network and assembly processes.
Results
CuONPs increased the soil nitrogenase activity and the diazotrophic diversity, and they also shifted the taxonomic and phylogenetic community composition, with increases in the proportions of Bradyrhizobium, Geobacter, Methylomonas, and Azobacter. Additionally, the high centralization and complexity of the soil diazotrophic co-occurrence network implied that CuONPs destabilized the soil diazotrophic community. We evaluated the importance of deterministic and stochastic processes with βNTI values and found that the soil diazotrophic community assembly was mainly structured by determinism across all experiments, and did not change after treatment with CuONPs.
Conclusions
Our results suggested that CuONPs can shape the diazotrophic communities and destabilize the community, which might go against crop nutrition and soil biological functions.
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Data availability
The data presented in this study are available on request from the corresponding author. The data are not publicly due to privacy.
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This work was supported by the National Natural Science Foundation of China (31800520), the Natural Science Foundation of Jilin Province (YDZJ202201ZYTS512), and the Startup Foundation for Introducing Talent of Jiangxi Agricultural University (9232308147).
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Cao, J., Liu, Z., Zhao, H. et al. Effects of copper oxide nanoparticles on soil diazotrophic communities in maize rhizosphere. J Soils Sediments 23, 1760–1774 (2023). https://doi.org/10.1007/s11368-023-03430-0
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DOI: https://doi.org/10.1007/s11368-023-03430-0