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Spartina alterniflora raised soil sulfide content by regulating sulfur cycle-associated bacteria in the Jiuduansha Wetland of China

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Abstract

Purpose

The Spartina alterniflora invasion across the southeast coast in China significantly reduced vegetation diversity and generated associated ecological problems. Sulfur (S) is a vital nutrient, while sulfide is phytotoxic and the impact of S. alterniflora invasion on soil S cycle remains unclear. Therefore, this study aims to investigate the impacts of S. alterniflora invasion on the S cycle and associated soil microbial communities.

Methods

Both field investigation and lab-scale experiments were conducted, analyzing soil sulfide and sulfate contents, soil properties over four seasons in the Jiuduansha Wetland of Shanghai, China, the high-throughput sequencing of soil microbial communities, S cycle-related functional genes and seed germination experiments.

Results

The contents of sulfide, soil organic carbon (SOC), and total nitrogen (TN) in the bulk soil of S. alterniflora invaded area were higher than those in the native species S. mariqueter habitat and bare mudflat soils. Spartina alterniflora invasion increased the abundance of the Nitrospiraceae and Desulfarculaceae families and reduced that of Hydrogenophilaceae. The relative abundance of the SO42− reduction functional genes (dsrA + dsrB) in the soil was increased after S. alterniflora invasion, while that of the S oxidation functional genes (yedZ + soxY) in the soil was reduced. Seed germination experiments with different sodium sulfide concentrations (Na2S) revealed that the phytotoxicity of sulfide caused more lethal damage to S. mariqueter than to S. alterniflora.

Conclusion

The S. alterniflora invasion significantly increased SOC and TN contents and reduced the abundance of sulfur-oxidizing functional genes, which led to the accumulation of soil sulfide.

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Data can be provided under reasonable request by contacting the corresponding author.

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Acknowledgements

This study was financially supported by the Natural Science Foundation of China (41971055,41907270), National Key Research and Development Program of China (2016YFA0601003), Science and Technology Commission of Shanghai Municipality (19DZ1205202), Chinese Postdoctoral Science Foundation (2020M671069). Great thanks to the group who provided invaluable support while the samples were collected.

Funding

This study was financially supported by the Natural Science Foundation (41971055, 41907270), National Key Research and Development Program of China (2016YFA0601003), Science and Technology Commission of Shanghai Municipality (19DZ1205202), Chinese Postdoctoral Science Foundation (2020M671069).

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Correspondence to Zhenzhen Zhao.

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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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He, C., Cheng, L., Wang, D. et al. Spartina alterniflora raised soil sulfide content by regulating sulfur cycle-associated bacteria in the Jiuduansha Wetland of China. Plant Soil 469, 107–121 (2021). https://doi.org/10.1007/s11104-021-05154-x

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  • DOI: https://doi.org/10.1007/s11104-021-05154-x

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