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<p>Industrial activities in chromate factories have significantly released chromium sludge into the environment, posing severe risks to local ecosystems and human health. Cr(VI), the most toxic and mobile form of chromium, possesses strong oxidizing capacity and confirmed carcinogenicity, posing serious risks to microbial communities and environmental health. Chromium (Cr) stress significantly affects microbial diversity, composition, and assembly, which is essential for evaluating ecological risks and resilience at contaminated sites. This study conducted comprehensive environmental factor testing and microbial analysis at a contaminated site, to elucidate the mechanisms by which Cr stress affects microbial communities. Cr concentration in the Source Zone (SZ) reached 1458.7&#xa0;mg/kg. Actinobacteriota, Proteobacteria and Chloroflexi were identified as the dominant phyla. Environmental factors, including Cr, Cr(VI), pH, Zn, Ni and sulfate, significantly influence microbial community structure. In the Control Zone (CZ) and Precautionary Zone (PZ), community assembly was primarily influenced by stochastic processes, whereas deterministic factors exerted a greater impact in SZ. High heavy metal content is the primary factors driving the reduction in microbial diversity and abundance in SZ, leading to complex co-occurrence patterns and closer interactions among the remaining microbial communities. This research enhances the understanding of microbial dynamics in chromium-contaminated sites and lays the groundwork for effective ecological restoration strategies, emphasizing the need for tailored intervention strategies to enhance community resilience and improve remediation efforts in each specific area.</p>

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Microbial Community Structure and Community Assembly Mechanisms in Chromium-Ccontaminated Sites

  • 期刊论文

  • 发表日期：

    2025年10月4日

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  • Yubo Ye,
  • Ruixia Hao,
  • Bing Shan,
  • Tong Liu,
  • Lingzi Meng,
  • Anhuai Lu

摘要

Industrial activities in chromate factories have significantly released chromium sludge into the environment, posing severe risks to local ecosystems and human health. Cr(VI), the most toxic and mobile form of chromium, possesses strong oxidizing capacity and confirmed carcinogenicity, posing serious risks to microbial communities and environmental health. Chromium (Cr) stress significantly affects microbial diversity, composition, and assembly, which is essential for evaluating ecological risks and resilience at contaminated sites. This study conducted comprehensive environmental factor testing and microbial analysis at a contaminated site, to elucidate the mechanisms by which Cr stress affects microbial communities. Cr concentration in the Source Zone (SZ) reached 1458.7 mg/kg. Actinobacteriota, Proteobacteria and Chloroflexi were identified as the dominant phyla. Environmental factors, including Cr, Cr(VI), pH, Zn, Ni and sulfate, significantly influence microbial community structure. In the Control Zone (CZ) and Precautionary Zone (PZ), community assembly was primarily influenced by stochastic processes, whereas deterministic factors exerted a greater impact in SZ. High heavy metal content is the primary factors driving the reduction in microbial diversity and abundance in SZ, leading to complex co-occurrence patterns and closer interactions among the remaining microbial communities. This research enhances the understanding of microbial dynamics in chromium-contaminated sites and lays the groundwork for effective ecological restoration strategies, emphasizing the need for tailored intervention strategies to enhance community resilience and improve remediation efforts in each specific area.