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Plantation rhizosphere soil microbes promote soil‒plant phosphorus feedback on the Tibetan Plateau

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Abstract

Background and aims

Afforestation can alter belowground microbial diversity and affect soil‒plant feedback, which is crucial for understanding nutrient cycles and ecosystem productivity. Most studies have focused on the carbon and nitrogen cycles in forest ecosystems; however, there are few studies on the effect of afforestation in soil microbial diversity on phosphorus (P) nutrients. In this study, we explored the effect of soil microbial communities on soil‒plant P feedback under long-term afforestation.

Methods

Typical poplar plantations were selected from the Lhasa River Basin. We assessed the P content, activity of extracellular enzyme related to P acquisition, rhizosphere soil microbes, and mechanism of microbial community.

Results

Increased bacterial richness and evenness were beneficial to soil and plant P nutrition; however, the community differentiation of bacteria and fungi had no positive effect on the P content. Ecological stochasticity drove for the assembly of the rhizosphere soil microbial community after afforestation on the Tibetan Plateau. Homogenizing dispersal dominated bacterial and fungal assemblies. Ecological drift was another stochastic process that affected the microbial assembly.

Conclusion

Bacterial richness and evenness had positive effects on soil‒plant P feedback, whereas microbial differentiation did not. Homogenizing dispersal and ecological drift are intrinsic factors that regulate the effects of microbial community diversity on soil‒plant P feedback processes.

This study provides the evidence on the intrinsic mechanism of belowground microbial diversity influencing soil‒plant P feedback. It also provides new insights into the selection of plantation species on the Tibetan Plateau from the perspective of enhancement of P nutrition by microbes.

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Data availability

The raw sequence data reported in this paper have been deposited in the Genome Sequence Archive (Chen et al. 2021) in National Genomics Data Center (CNCB-NGDC Members and Partners 2022), China National Center for Bioinformation / Bei**g Institute of Genomics, Chinese Academy of Sciences (GSA: CRA006086 for 16S rRNA gene amplicon datasets and CRA006090 for ITS2 gene amplicon datasets) that would be publicly accessible at https://ngdc.cncb.ac.cn/gsa. The data for soil P, SP, soil pH, root P, branch P, and leaf P can be found in Table S1.

Abbreviations

AIC:

Akaike information criterion

βMNTD:

The beta mean nearest taxon distance

βNTI:

The beta nearest taxon index

C:

Carbon

Df:

Degree of freedom

LDA:

Linear discriminant analysis

LEfSe:

LDA effect size

MCD:

Microbial community structure diversity

NMDS:

Nonmetric multidimensional scaling

OTUs:

Operational Taxonomic Units

P:

Phosphorus

PA:

Populus alba L.

PB:

Populus × bei**gensis

PC:

The blank plots

Po:

Organic phosphorus

PSM:

Phosphate solubilizing microbes

PZ:

Populus szechuanica Var. tibetica Schneid.

R2 :

The amount of variance explained by the model

Rc 2 :

The conditional R2

Rm 2 :

The marginal R2

RCBray :

The taxonomic beta diversity metric Bray–Curtis-based Raup–Crick

SEM:

The structural equation model

SP:

Soil phosphatase

VIFs:

Variance inflation factors

References

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Acknowledgements

This work was supported by the Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0404), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA20020401), Science and Technology Major Project of Tibetan Autonomous Region of China (XZ202201ZD0005G02) and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

Authors

Contributions

R.X.L. performed the experiments, created the figures, and wrote the manuscript. Y.Y., Z.A.G., and Q.L. investigated the data. S.Z. conceived the original research plans, designed the experiments and revised the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Sheng Zhang.

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Competing interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Enrique Valencia.

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Liu, R., Yao, Y., Guo, Z. et al. Plantation rhizosphere soil microbes promote soil‒plant phosphorus feedback on the Tibetan Plateau. Plant Soil (2023). https://doi.org/10.1007/s11104-023-05939-2

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