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Changes in composition and function of soil microbial communities during secondary succession in oldfields on the Tibetan Plateau

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Abstract

Aim

Soil microbes can significantly influence restoration outcomes via interaction with plant community assembly processes, yet knowledge about variation in soil microbial communities – in particular functional variation – during oldfield succession is limited.

Methods

We divided a well-dated successional chronosequence on the Tibetan Plateau into five stages: stage 1 (continued arable land), stage 2 (arable abandoned for 2 years), stage 3 (arable abandoned for 10 years), stage 4 (arable abandoned for 20 years), and natural grassland. We investigated the changes in taxonomic and functional composition of bacterial and fungal communities in these successional stages.

Results

The richness of bacterial and fungal communities had a unimodal relationship with successional age, as the both were initially low and decreased again in natural grasslands. These changes were more correlated to soil properties. For both bacterial and fungal communities, taxonomic similarity to natural grasslands increased monotonously with successional age. The functional composition of bacterial communities shifted with successional age towards increased importance of strains involved in the C cycle rather than the N cycle, due to higher plant richness. For fungal communities, saprotrophs showed an increasing trend with successional age although low relative abundance in natural grasslands, which was regulated by belowground biomass. Symbiotrophs did not change during succession, but pathotrophic fungal relative abundance decreased rapidly after agricultural abandonment because of increased plant richness.

Conclusions

Overall, twenty years of oldfield succession did not appear to restore richness of soil bacterial and fungal communities to the levels of natural grasslands. Community taxonomic and functional composition in successional stages up to 20 y old were also different from natural grasslands. Our results suggest more important role of plant community than microbial community to soil nutrient cycling during restoration in oldfields.

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Data availability

The raw sequence data were submitted to the NCBI Sequence Read Archive under BioProject ID PRJNA850533 for bacteria and PRJNA997942 for fungi. Other data will be made available from the corresponding author on reasonable request.

References

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Acknowledgements

We thank Pengpeng Wang for invaluable help in fieldwork. We are grateful to Prof. Manuel Delgado Baquerizo for his comments on the manuscript. This study was financially supported by the National Key R&D Program of China (2017YFC0504801), and the Key Research Program of Gansu (20ZD7FA005, 22ZD6NA007). Hui Ma is supported by the Chinese Scholarship Council joint PhD scholarship.

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Authors and Affiliations

Authors

Contributions

ZGZ, HM, XMS, ZZH conceived the ideas and designed methodology; ZGZ received the funding; HM, XPY, YZQ, ELG, XFS, SW and YXW finished filed and laboratory work; HM performed the data processing and statistical analysis; HM, ZGZ, HHB and XMS led the writing and comment of the manuscript. All authors contributed critically to the writing and editing drafts and gave final approval for publication.

Corresponding authors

Correspondence to Xiaoming Shi or Zhigang Zhao.

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Competing interests

The authors declare that the research was no conflict of any commercial or financial relationships.

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Responsible Editor: Matthew A. Bowker.

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Ma, H., Yan, X., Gao, E. et al. Changes in composition and function of soil microbial communities during secondary succession in oldfields on the Tibetan Plateau. Plant Soil 495, 429–443 (2024). https://doi.org/10.1007/s11104-023-06336-5

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  • DOI: https://doi.org/10.1007/s11104-023-06336-5

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