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<p>Denitrification in suspended sediments (SPS) plays a critical role in nitrogen removal within aquatic systems, yet the influence of pollution gradients on this process remains poorly understood. This study investigated denitrification performance and microbial metabolic adaptations across SPS from pollution-defined riparian zones (20&#xa0;m near-shore/L20, 40&#xa0;m mid-shore/L40, 100&#xa0;m far-shore/L100) in Meiliang Bay of eutrophic Lake Taihu. Results showed a clear contamination gradient: nutrients and heavy metals decreased successively from near-shore (highest) to mid-shore to far-shore (lowest). Notably, SPS in L40 had the higher N<sub>2</sub> and N<sub>2</sub>O release rates than L20 and L100, despite intermediate pollution levels, suggesting non-linear relationships between contamination magnitude and denitrification efficiency. Compared with L20 and L100, L40 sediments exhibited superior carbon metabolism (EMP/PPP), driving elevated activities of denitrifying enzymes (NAR, NIR, NOS) and higher abundances of associated functional genes (<i>narG</i>, <i>nirS</i>, <i>nosZ</i>). This demonstrates that SPS denitrification is governed not simply by pollution magnitude but by pollution-driven microbial metabolic reconfiguration. This study provides novel insight into SPS-denitrification performance in lakeshore zone with different offshore distances, with critical implications for managing eutrophic and metal-contaminated aquatic ecosystems.</p>

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Denitrification in Suspended Sediment Systems at Different Riparian Distances: Performance and Metabolism Analysis

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Shang Shi,
  • Songqi Liu,
  • Dapeng Li,
  • Xinrui Yan,
  • Ziyu Li,
  • Zikui He,
  • Jun Hou,
  • Yangyang Yang

摘要

Denitrification in suspended sediments (SPS) plays a critical role in nitrogen removal within aquatic systems, yet the influence of pollution gradients on this process remains poorly understood. This study investigated denitrification performance and microbial metabolic adaptations across SPS from pollution-defined riparian zones (20 m near-shore/L20, 40 m mid-shore/L40, 100 m far-shore/L100) in Meiliang Bay of eutrophic Lake Taihu. Results showed a clear contamination gradient: nutrients and heavy metals decreased successively from near-shore (highest) to mid-shore to far-shore (lowest). Notably, SPS in L40 had the higher N2 and N2O release rates than L20 and L100, despite intermediate pollution levels, suggesting non-linear relationships between contamination magnitude and denitrification efficiency. Compared with L20 and L100, L40 sediments exhibited superior carbon metabolism (EMP/PPP), driving elevated activities of denitrifying enzymes (NAR, NIR, NOS) and higher abundances of associated functional genes (narG, nirS, nosZ). This demonstrates that SPS denitrification is governed not simply by pollution magnitude but by pollution-driven microbial metabolic reconfiguration. This study provides novel insight into SPS-denitrification performance in lakeshore zone with different offshore distances, with critical implications for managing eutrophic and metal-contaminated aquatic ecosystems.