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Background <p>Soil bacterial communities associated with salt-tolerant plants and halophytes play a crucial role in plant adaptation and saline-sodic soil remediation.</p> Method <p>This study aims to investigate the variations in the soil bacterial community composition, function, and assembly processes under three vegetation in saline-sodic soil of the Songnen Plain, China: <i>Suaeda corniculata</i> (SC), <i>Artemisia scoparia</i> (AS), and <i>Leymus chinensis</i> (LC), with bare land (BL) serving as a control.</p> Results <p>The results showed that saline-sodic soil parameters were significantly lower under different salt-tolerant plants and halophytes than in the BL, and the physicochemical properties of the soil were significantly better. The high-throughput sequencing technology revealed that the bacterial Shannon indexes and the Chao1 indexes in LC were higher than that in AS, SC, and BL, respectively. <i>Actinobacteria</i>,&#xa0;<i>Proteobacteria</i>,&#xa0;<i>Acidobacteria</i>, and&#xa0;<i>Gemmatimonadota</i> were the dominant phyla,&#xa0;<i>Longimicrobiaceae</i>,&#xa0;<i>Nitriliruptoraceae</i>, and&#xa0;<i>Salinarimonas</i>&#xa0;were the dominant genera. Total nitrogen (TN), root weight density (RWD), soil structure stability index (SSI), and electrical conductivity (EC) were key factors affecting dominant bacterial composition under different salt-tolerant plants and halophytes. Functional predictions indicated that BL is dominated by anaerobic chemoheterotrophy, and that the relative abundance of aerobic chemoheterotrophy and nitrogen cycling increases progressively with the growth of salt-tolerant plants and halophytes. Stochastic processes, particularly ecological drift, governed bacterial community assembly across all sites, though deterministic processes became more prominent in LC.</p> Conclusions <p>These findings highlight the role of salt-tolerant plants and halophytes in shaping soil microbial communities and advance our understanding of plant-soil-bacterial interactions in saline-sodic environment.</p>

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Divergent response of soil bacterial to environmental factors change under different vegetation in saline-sodic soil of the Songnen Plain

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Yujie Wu,
  • Florence Nyambura Gikonyo,
  • Shiyuan Yin,
  • Kexin Zhu,
  • Zhaoqiang Ju,
  • Kai Guo,
  • Xiaojing Liu

摘要

Background

Soil bacterial communities associated with salt-tolerant plants and halophytes play a crucial role in plant adaptation and saline-sodic soil remediation.

Method

This study aims to investigate the variations in the soil bacterial community composition, function, and assembly processes under three vegetation in saline-sodic soil of the Songnen Plain, China: Suaeda corniculata (SC), Artemisia scoparia (AS), and Leymus chinensis (LC), with bare land (BL) serving as a control.

Results

The results showed that saline-sodic soil parameters were significantly lower under different salt-tolerant plants and halophytes than in the BL, and the physicochemical properties of the soil were significantly better. The high-throughput sequencing technology revealed that the bacterial Shannon indexes and the Chao1 indexes in LC were higher than that in AS, SC, and BL, respectively. Actinobacteria, Proteobacteria, Acidobacteria, and Gemmatimonadota were the dominant phyla, Longimicrobiaceae, Nitriliruptoraceae, and Salinarimonas were the dominant genera. Total nitrogen (TN), root weight density (RWD), soil structure stability index (SSI), and electrical conductivity (EC) were key factors affecting dominant bacterial composition under different salt-tolerant plants and halophytes. Functional predictions indicated that BL is dominated by anaerobic chemoheterotrophy, and that the relative abundance of aerobic chemoheterotrophy and nitrogen cycling increases progressively with the growth of salt-tolerant plants and halophytes. Stochastic processes, particularly ecological drift, governed bacterial community assembly across all sites, though deterministic processes became more prominent in LC.

Conclusions

These findings highlight the role of salt-tolerant plants and halophytes in shaping soil microbial communities and advance our understanding of plant-soil-bacterial interactions in saline-sodic environment.