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Purpose <p>The Ebinur Lake Wetland in Xinjiang, China, is a unique ecosystem with abundant saline plants and a salt desert environment. Despite its ecological significance, knowledge of the bacterial community and nutrient cycling processes is limited.</p> Methods <p>This study investigated the bacterial community in the rhizosphere of <i>Phragmites australis</i> across 10 sample sites in three seasons using high-throughput sequencing of 16&#xa0;S rRNA genes.</p> Results <p>We found that all sites had alkaline soils with pH values from 8.10 to 8.90, and electrical conductivity (EC) ranged from 0.09 to 12.62 ms/cm. Alpha diversity was highest in summer. The bacterial community was predominantly composed of <i>Proteobacteria</i>, <i>Firmicutes</i>, and <i>Bacteroidota</i>, demonstrating significant variations across sampling sites and seasons. FAPROTAX functional predictions indicated that bacteria were primarily involved in nitrogen metabolism, iron/manganese respiration, photoautotrophy, chemoheterotrophy, and fermentation. Co-occurrence network analysis revealed interactions between <i>Proteobacteria</i> and other bacterial taxa, along with temporal fluctuations in key genera. Redundancy analysis (RDA) identified EC and available potassium (AK) as significant abiotic factors correlate with bacterial α-diversity, whereas spearman correlation analysis showed that EC and organic matter (OM) primarily determined community composition.</p> Conclusions <p>This study reveals the rich and dynamic bacterial communities within the <i>Phragmites australis</i> rhizosphere, with their diversity and structure significantly influenced by temporal dynamics and spatial heterogeneity. These findings enhance our understanding of nutrient cycling in this saline desert ecosystem and provide critical insights for its conservation and sustainable management.</p>

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Spatiotemporal Dynamics of Bacterial Communities and Functions in the Rhizosphere of Phragmites Australis (Ebinur Lake Wetland, China)

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Bo He,
  • Wenge Hu,
  • Xuemei Chen

摘要

Purpose

The Ebinur Lake Wetland in Xinjiang, China, is a unique ecosystem with abundant saline plants and a salt desert environment. Despite its ecological significance, knowledge of the bacterial community and nutrient cycling processes is limited.

Methods

This study investigated the bacterial community in the rhizosphere of Phragmites australis across 10 sample sites in three seasons using high-throughput sequencing of 16 S rRNA genes.

Results

We found that all sites had alkaline soils with pH values from 8.10 to 8.90, and electrical conductivity (EC) ranged from 0.09 to 12.62 ms/cm. Alpha diversity was highest in summer. The bacterial community was predominantly composed of Proteobacteria, Firmicutes, and Bacteroidota, demonstrating significant variations across sampling sites and seasons. FAPROTAX functional predictions indicated that bacteria were primarily involved in nitrogen metabolism, iron/manganese respiration, photoautotrophy, chemoheterotrophy, and fermentation. Co-occurrence network analysis revealed interactions between Proteobacteria and other bacterial taxa, along with temporal fluctuations in key genera. Redundancy analysis (RDA) identified EC and available potassium (AK) as significant abiotic factors correlate with bacterial α-diversity, whereas spearman correlation analysis showed that EC and organic matter (OM) primarily determined community composition.

Conclusions

This study reveals the rich and dynamic bacterial communities within the Phragmites australis rhizosphere, with their diversity and structure significantly influenced by temporal dynamics and spatial heterogeneity. These findings enhance our understanding of nutrient cycling in this saline desert ecosystem and provide critical insights for its conservation and sustainable management.