Zhang Decai, Qian Yingying, Qian Lvxin, Huang Xiaohong, Luo Cheng, Wang Lei, Cai Minggang, Jiang Jheng-Jie, Wang Xiong, Lin Yan
School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361021, China; Xiamen Key Laboratory of Membrane Research and Application, Xiamen 361024, China.
School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361021, China.
Mar Pollut Bull. 2025 Jun;215:117825. doi: 10.1016/j.marpolbul.2025.117825. Epub 2025 Mar 22.
Understanding the bioaccumulation of PAHs in mangrove plants is crucial as it reflects the ecosystem's ability to mitigate pollution and minimize its impacts on surrounding environments. The Zhangjiang Estuary mangrove ecosystem is a vital ecological asset in Fujian Province, however, the interactions between contaminants, such as polycyclic aromatic hydrocarbons (PAHs), and mangrove plant tissues remain underexplored. This study investigates the different bioaccumulation patterns and machanism of 26 PAHs in three mangrove species (Kandelia obovata, Aegiceras corniculatum, and Avicennia marina). PAHs concentrations in mangrove and estuarine sediments ranged from 55.68 to 247.76 ng/g and 119.16 to 346.03 ng/g, while ΣPAHs in the mangrove plants ranged from 13.03 to 172.17 ng/g, which was dominated by two- and five-ring PAHs. The bioconcentration factors (BCFs) of plant tissues showed a wide range, from 0 to 330.17, stems exhibited the highest PAHs concentrations compared to roots and leaves, with BCFs in stems following average enrichment factors: two-ring PAHs (37.23 ± 13.33) > alkylated PAHs (9.40 ± 4.66) > three-ring PAHs (3.09 ± 2.20) > six-ring PAHs (2.29 ± 0.36) > five-ring PAHs (0.52 ± 0.06) > four-ring PAHs (0.03 ± 0.01). The BCFs in roots showed strong positive correlations with logKow and Koc values, while the trends in stems and leaves were reversed, suggesting that roots showed high affinity for hydrophobic compounds, while stems and leaves preferred more water-soluble PAHs. The bioaccumulation capacity was highest in Aegiceras corniculatum, followed by Kandelia obovata and Avicennia marina. Additionally, alkylated PAHs were more enriched than their parent compounds, indicating selective uptake potential in mangrove plants. These findings underscore the critical role of mangrove species in mitigating PAHs contamination through selective absorption and accumulation. The results provide valuable insights into the application of mangrove ecosystems in bioremediation and offer guidance for environmental management in coastal regions.
了解多环芳烃在红树林植物中的生物累积情况至关重要，因为它反映了生态系统减轻污染并将其对周围环境的影响降至最低的能力。漳江口红树林生态系统是福建省重要的生态资产，然而，多环芳烃（PAHs）等污染物与红树林植物组织之间的相互作用仍未得到充分研究。本研究调查了三种红树林物种（秋茄、桐花树和白骨壤）中26种多环芳烃的不同生物累积模式和机制。红树林和河口沉积物中的多环芳烃浓度范围分别为55.68至247.76纳克/克和119.16至346.03纳克/克，而红树林植物中的总多环芳烃浓度范围为13.03至172.17纳克/克，其中以二环和五环多环芳烃为主。植物组织的生物富集系数（BCFs）范围很广，从0到330.17，茎中多环芳烃浓度高于根和叶，茎中的生物富集系数遵循平均富集因子顺序：二环多环芳烃（37.23±13.33）＞烷基化多环芳烃（9.40±4.66）＞三环多环芳烃（3.09±2.20）＞六环多环芳烃（2.29±0.36）＞五环多环芳烃（0.52±0.06）＞四环多环芳烃（0.
