Stochastic community assembly of abundant taxa maintains the relationship of soil biodiversity-multifunctionality under mercury stress

Highlights

● Soil abundant taxa diversity positively related to multifunctionality under Hg stress.

● Microbial network complexity of soil abundant taxa supported the strength of SBF.

● Stochastic assembly of soil abundant subcommunity supported the strength of SBF.

● Stochastic ratio was the most important predictor for the strength of SBF.

Abstract

It is known that soil microbial communities are intricately linked to multiple ecosystem functions and can maintain the relationship between soil biodiversity and multifunctionality (SBF) under environmental stresses. However, the relative contributions and driving forces of abundant and rare taxa within the communities in maintaining soil biodiversity-multifunctionality relationship under pollution stresses are still unclear. Here, we conducted microcosm experiments to estimate the importance of soil abundant and rare taxa in predicting these relationships under heavy metal mercury (Hg) stress in paired paddy and upland fields. The results revealed that the diversity of abundant taxa, rather than rare taxa, was positively related to multifunctionality, with the abundant subcommunity tending to maintain a larger proportion of soil functions including chitin degradation, protein degradation, and phosphorus mineralization. Soil multitrophic network complexity consisting of abundant species showed positive correlations with biodiversity and multifunctionality, and supported the strength of SBF within a network complexity range. Stochastic assembly processes of the abundant subcommunity were positively correlated with the strength of SBF, although stochastic processes decreased the biodiversity and the multifunctionality, respectively. After simultaneously accounting for multiple factors on the strength of SBF, we found that the stochastic community assembly ratio of abundant taxa was the most important predictor for SBF strength under Hg stress. Our results highlight the importance of abundant taxa in supporting soil multifunctionality, and elucidate the linkages between community assembly, network complexity and SBF relationship under environmental stresses.

Graphical abstract

Keywords

abundant taxa / biodiversity-multifunctionality relationship / community assembly / network complexity / environmental stresses

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Data availability

The raw bacterial, fungal, and protistan sequencing data reported in this paper are available in the NCBI Sequence Read Archive under BioProject PRJNA914639, PRJNA803336, and PRJNA803337, respectively.

Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (42177022 and 41877120) and Natural Science Foundation of Hubei Province, China (2020CFA013). We thank Dr. Xiao-Min Zeng from Huazhong Agricultural University for her helpful suggestions in manuscript writing.

Author contributions

Shuai Du: Conceptualization, Methodology, Software, Formal analysis, Investigation, Writing-original draft, Writing-review and editing, Visualization. Xin-Qi Li: Data curation, Software, Formal analysis, Writing-review and editing, Visualization. Li Bi: Data curation, Software, Formal analysis, Writing-review and editing, Visualization. Dong Zhu: Formal analysis, Investigation, Writing-review and editing, Visualization. Hang-Wei Hu: Formal analysis, Investigation, Writing-review and editing, Visualization. Xiuli Hao: Formal analysis, Investigation, Writing-review and editing, Visualization. Jiao Feng: Formal analysis, Investigation, Writing-review and editing, Visualization. Qiaoyun Huang: Formal analysis, Investigation, Writing-review and editing, Visualization. Yu-Rong Liu: Conceptualization, Investigation, Writing-review and editing, Supervision, Resources, Funding acquisition.

Ethics declarations

The authors declare that they have no competing interests.

Electronic supplementary material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s42832-023-0197-z and is accessible for authorized users.

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