Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region.
Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region.
Environ Pollut. 2014 Apr;187:136-44. doi: 10.1016/j.envpol.2014.01.003. Epub 2014 Jan 31.
The study aims to examine relationships between microbial community structure and mixed pollutants of polycyclic aromatic hydrocarbons (PAHs) and polybrominated diphenyl ethers (PBDEs) in constructed wetland microcosms, planted with Excoecaria agallocha or Kandelia obovata, two common mangrove plant species, and under two tidal regimes, everyday tidal (Te) and no tidal flooding (Tn). Results showed both microbial community structure and the retained amounts of pollutants were significantly determined by tidal regime, while the effect of plant species was small. Higher amounts of PAHs but lower amounts of PBDEs were always retained in sediments under Te than Tn regimes. Accordingly, temporal and vertical distributions of microbial community structure differed greatly between the two tidal regimes. Redundancy analysis further revealed significant correlation between a subgroup of the mixed PAHs and PBDEs with variation in microbial community structure. The findings will help to propose specific strategies to improve the bioremediation efficiency of constructed wetland.
本研究旨在考察人工湿地微环境中微生物群落结构与多环芳烃（PAHs）和多溴二苯醚（PBDEs）混合污染物之间的关系，湿地中种植了两种常见的红树林植物：桐花树（Excoecaria agallocha）或秋茄（Kandelia obovata），并采用两种潮汐模式，即日常潮汐（Te）和无潮汐淹没（Tn）。结果表明，潮汐模式显著决定了微生物群落结构和污染物的保留量，而植物种类的影响较小。Te 模式下沉积物中 PAHs 的保留量较高，而 PBDEs 的保留量较低。因此，两种潮汐模式下微生物群落结构的时空和垂直分布差异很大。冗余分析进一步表明，混合 PAHs 和 PBDEs 的一个亚组与微生物群落结构的变化显著相关。这些发现将有助于提出提高人工湿地生物修复效率的具体策略。
