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Aims <p>This study investigates the interactions between trace metal types, concentrations, and speciation in mangrove sediments, alongside antioxidant enzymes, malondialdehyde, and glutathione in mangrove plants.</p> Methods <p>One of the primary methodological innovations of this study lies in the characterization of the concentration and speciation dynamics of eight trace metals (Cu, Zn, Cd, Ni, Pb, As, Hg and Co) in vertical (50-cm cores) and tidal gradient transects. Another key methodological advancement involves employ structural equation modelling to identify key drivers of trace metals accumulation. The research employed correlation analysis to assess trace metal stress risks and the key tolerance mechanisms of mangroves. Novel insights were gained regarding trace metal accumulation in mangrove wetlands and the corresponding tolerance responses of mangroves.</p> Results <p>(1) Trace metal enrichment was significantly higher in mangrove sediments than in bare mudflats; (2) 62.5% of trace metals decreased from high- to low-tide zones. Pd, Cd, Hg, Cu, Co, and Zn generally declined with depth in mangroves, whereas most increased in mudflats; (3) Trace metal speciation was dominated by residual, oxidizable, and reducible fractions, indicating reduced bioavailability through sulfides and organic complexes; (4) Total nitrogen (TN) and total phosphorus (TP) were key factors affecting trace metals accumulation via organic matter and microbial activity; (5) Mangroves maintained growth under metal stress by activating antioxidant defenses.</p> Conclusion <p>This study reveals that trace metals accumulation exhibited clear spatial zonation, influenced primarily by sediment TN and TP. Mangroves tolerate metal stress through intrinsic antioxidant systems, underpinning their role as effective trace metal sinks.</p>

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Accumulation effects, driving mechanisms, and primary tolerance strategies of trace metals in mangrove-sediments system

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Qiong Tao,
  • Weiheng Qin,
  • Yipeng An,
  • Jinli Huang,
  • Chunxiang Liu,
  • Jin Luo,
  • Haitao Chen,
  • Wenhui Liao,
  • Bingxin Li,
  • Zhangpeng Lu,
  • Zhuokai Wu,
  • Gang Luo,
  • Yongze Xing,
  • Xiang Sun

摘要

Aims

This study investigates the interactions between trace metal types, concentrations, and speciation in mangrove sediments, alongside antioxidant enzymes, malondialdehyde, and glutathione in mangrove plants.

Methods

One of the primary methodological innovations of this study lies in the characterization of the concentration and speciation dynamics of eight trace metals (Cu, Zn, Cd, Ni, Pb, As, Hg and Co) in vertical (50-cm cores) and tidal gradient transects. Another key methodological advancement involves employ structural equation modelling to identify key drivers of trace metals accumulation. The research employed correlation analysis to assess trace metal stress risks and the key tolerance mechanisms of mangroves. Novel insights were gained regarding trace metal accumulation in mangrove wetlands and the corresponding tolerance responses of mangroves.

Results

(1) Trace metal enrichment was significantly higher in mangrove sediments than in bare mudflats; (2) 62.5% of trace metals decreased from high- to low-tide zones. Pd, Cd, Hg, Cu, Co, and Zn generally declined with depth in mangroves, whereas most increased in mudflats; (3) Trace metal speciation was dominated by residual, oxidizable, and reducible fractions, indicating reduced bioavailability through sulfides and organic complexes; (4) Total nitrogen (TN) and total phosphorus (TP) were key factors affecting trace metals accumulation via organic matter and microbial activity; (5) Mangroves maintained growth under metal stress by activating antioxidant defenses.

Conclusion

This study reveals that trace metals accumulation exhibited clear spatial zonation, influenced primarily by sediment TN and TP. Mangroves tolerate metal stress through intrinsic antioxidant systems, underpinning their role as effective trace metal sinks.