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Composition and assembly of soil bacterial communities between tidal saltwater and freshwater marshes in China

Pengfei Zhan, Hang Wang, Kam Tang Orcid Logo, Josep Penuelas, Jiafang Huang, Na Liu, Chuan Tong

Applied Soil Ecology, Volume: 201, Start page: 105508

Swansea University Author: Kam Tang Orcid Logo

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DOI (Published version): 10.1016/j.apsoil.2024.105508

Abstract

With the increasing salinization of coastal lowlands due to sea level rise, a comprehensive assessment of salinity effects on soil microbial community is crucial for understanding and predicting the corresponding shifts in ecological processes. We compared topsoil bacterial samples from tidal saltwa...

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Published in: Applied Soil Ecology
ISSN: 0929-1393
Published: Elsevier BV 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa66969
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Abstract: With the increasing salinization of coastal lowlands due to sea level rise, a comprehensive assessment of salinity effects on soil microbial community is crucial for understanding and predicting the corresponding shifts in ecological processes. We compared topsoil bacterial samples from tidal saltwater and freshwater marshes, both dominated by Phragmites australis, in six main estuaries along the tropical-subtropical gradient in China. The bacterial communities in both saltwater and freshwater marshes had similar niche breadths, suggesting similar ability to exploit resources. Salinity difference limited the exchange of bacteria between the two habitats, with only 8.9 % of operational taxonomic units shared between the two communities. Network analysis suggested that the average path length was shorter in the saltwater marshes than the freshwater marshes, and the higher negative cohesion in saltwater marsh networks would enhance the network stability. The assembly of both communities was mostly stochastic, but freshwater marsh communities demonstrated a stronger diffusion restriction than saltwater counterparts. These results suggest that increasing salinization of coastal lowlands will alter the taxonomic and network characteristics of soil microbes, especially in the tidal freshwater marsh, but the stochastic nature of the assembly suggests that the changes may be irreversible.
Keywords: Salinity, Tidal marshes, Community assembly, Network analysis
College: Faculty of Science and Engineering
Funders: This work was financially supported by grants from the National Natural Science Foundation of China (No. 41877335 and 42177213 ) and the National Key Research and Development Program of China (No. 2022YFC3105401 ). JP was funded by the Spanish Government Grant PID2019-110521GB-I00 , the Catalan government grant SGR2017-1005 and the Fundación Ramón Areces grant CIVP20A6621.
Start Page: 105508

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