Abstract
Soils harbor a huge diversity of microorganisms that participate in various biogeochemical cycles and influence soil fertility. Our knowledge of soil microbiota, however, is limited by the complexity and heterogeneity of soil habitats and the huge microbial diversity. In this study, fertilized and unfertilized soils from a long-term fertilization experiment were gamma-sterilized before self- or cross-inoculation with non-sterilized soil aliquots containing their respective microbial communities. Bacterial community dynamics resulting from each reinoculated treatment was monitored over 90 days using B-ARISA. This study design allowed us to assess the respective influences of two driving factors, original community and soil nutrient availability, on microbial community assemblage dynamics. For all treatments, the bacterial communities that evolved in the sterilized soils differed from those in the original soils and displayed dynamic shifts over time. These shifts were particularly illustrated by the appearance of numerous OTUs that were undetectable in the original soils and suggest that community assembly is primarily determined by niche factors. However, stronger community shifts and higher variations among the replicates were observed after reinoculation of nutrient-rich soil, suggesting an increased impact of stochastic processes on community assembly. Our results demonstrate that reinoculation-based approaches are not only valid for detecting a variety of low abundant soil bacteria but also for distinguishing the soil characteristics and ecological rules that shape soil microbial population assemblage.
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Acknowledgments
This study was financially supported by the HIGRADE PhD scholarship of Davide Francioli and by special funds provided by the Helmholtz Centre for Environmental Research - UFZ. We wish to thank Ines Merbach and the workers of the Bad Lauchstädt research station for their support during soil sampling and Gabriele Henning, Jacqueline Rose, and Renate Rudloff for kindly providing the soil parameters. We are also grateful to Caterina Maggi for her assistance.
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Table S1 Mean values of the number of OTUs detected in each treatment. Fig. S1 Schematic representation of the microcosm experimental setup adopted in this work. Fig. S2 Bacterial richness observed in all soil treatments investigated during the experiment. No significant changes in richness were observed among all the treatments and/or over time according to Fischer’s LSD test p < 0.05. Fig. S3 Venn diagrams showing specific and common bacterial OTUs between the reinoculated microcosms (uU, uF, fU, and fF), and the original soils (U-0 and F-0) after (a) 25 days and (b) 90 days from the beginning of the experiment. Fig. S4 Venn diagrams showing specific and common bacterial OTUs among the same treatments at different time points (after 25 days and 90 days). (PDF 413 kb)
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Francioli, D., Schulz, E., Purahong, W. et al. Reinoculation elucidates mechanisms of bacterial community assembly in soil and reveals undetected microbes. Biol Fertil Soils 52, 1073–1083 (2016). https://doi.org/10.1007/s00374-016-1141-5
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DOI: https://doi.org/10.1007/s00374-016-1141-5