Key Laboratory of Lake and Watershed Science for Water Security, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Key Laboratory of Lake and Watershed Science for Water Security, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Ecotoxicol Environ Saf. 2024 Oct 1;284:117012. doi: 10.1016/j.ecoenv.2024.117012. Epub 2024 Sep 6.
The submerged plant Vallisneria natans plays an important role in the remediation of polycyclic aromatic hydrocarbon (PAH)-contaminated sediments. In this study, V. natans and sediments were collected from different V. natans natural vegetation zones, and sediment mesocosms were set up for phytoremediation tests. In addition, commercial-grade V. natans were obtained from the Fish-Bird-Flower market for comparison with phytoremediation. Phytoremediation using V. natans from natural growth significantly increased the degradation of PAHs in Dashui Harbor (0.0148±0.0015 d) and Taihu Lake bay sediments (0.0082±0.0010 d) but not in commercial-grade V. natans. Transplanted V. natans from natural growth had a significant (p=0.002) effect on PAH degradation, especially in highly PAH-contaminated sedimentary environments. The distinct bacterial communities were strongly affected by sediment type and V. natans type, which contributed to different phytoremediation patterns. Less complex but more stable microbial co-occurrence networks play key roles in improving PAH phytoremediation potential. In addition, V. natans from natural growth in highly PAH-contaminated sediment could adapt to PAH stress by exuding tryptophan metabolites to assemble health-promoting microbiomes. This study provides novel evidence that initial microbial and physicochemical characteristics of sediment and submerged plant types should be considered in the use of bioremediation management strategies for organic pollutant-contaminated sediments.
沉水植物苦草在多环芳烃（PAH）污染沉积物的修复中起着重要作用。本研究从不同苦草自然植被区采集苦草和沉积物，设置沉积物中观生态系统进行植物修复试验。此外，从花鸟市场购买了商用级苦草进行植物修复比较。与商业级苦草相比，天然生长的苦草进行植物修复显著增加了大水港（0.0148±0.0015 d）和太湖湾沉积物（0.0082±0.0010 d）中 PAHs 的降解。天然生长的移植苦草对 PAH 降解有显著影响（p=0.002），特别是在高度多环芳烃污染的沉积环境中。不同的沉积物类型和苦草类型强烈影响着明显不同的细菌群落，从而导致不同的植物修复模式。不那么复杂但更稳定的微生物共同发生网络在提高 PAH 植物修复潜力方面发挥着关键作用。此外，在高度多环芳烃污染的沉积物中，天然生长的苦草可以通过分泌色氨酸代谢物来适应 PAH 胁迫，从而组装出促进健康的微生物组。本研究提供了新的证据，表明在使用生物修复管理策略来管理有机污染物污染沉积物时，应考虑沉积物和沉水植物类型的初始微生物和物理化学特征。
