Insight into the long-term effect of mangrove species on removal of polybrominated diphenyl ethers (PBDEs) from BDE-47 contaminated sediments
Insight into the long-term effect of mangrove species on removal of polybrominated diphenyl ethers (PBDEs) from BDE-47 contaminated sediments
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深入了解红树林物种对去除 BDE-47 污染沉积物中多溴二苯醚 (PBDE) 的长期影响
DOI：
10.1016/j.scitotenv.2016.10.040
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发表时间：
2017-01-01
影响因子：
9.8
通讯作者：
Zheng, Hai-Lei
中科院分区：
文献类型：
--
作者：
Chen, Juan;Wang, Chao;Zheng, Hai-Lei
多溴联苯醚（PBDEs）已成为普遍存在的环境污染物，特别是在红树林湿地。然而，人们对红树林植物对受污染沉积物中多溴二苯醚清除的长期影响知之甚少。开展了为期12个月的微生态系统实验，以了解两种红树林，即白骨壤（Am）和桐花树（Ac）对BDE-47干重2000 ng/g（-1）的沉积物中多溴二苯醚的去除效果，并探索种植对BDE-47去除效果产生影响的微生物机制。结果表明，在为期12个月的实验中，种植红树林（Am或Ac）可加速BDE-47从污染沉积物中的去除，主要是通过促进微生物降解过程。与醋酸盐沉积物相比，硝酸盐沉积物对BDE-47的降解效率显著提高，这可能主要归因于硝酸盐沉积物中较高的脲酶和脱氢酶活性，以及较高的总细菌和有机卤化物呼吸细菌（OHRB）16 S rRNA基因拷贝数。此外，种植可以改变沉积物细菌群落的组成，并选择性地丰富一些负责多溴二苯醚降解的细菌属。Am对PBDE潜在降解菌的选择性富集作用与Ac明显不同。这些结果表明，长期种植红树林物种，特别是Am，可以显着促进BDE-47从污染的沉积物中的去除，通过增强微生物活性，增加总细菌和OHRB丰度和改变细菌群落组成。(C)2016爱思唯尔B. V.保留所有权利。
Polybrominated diphenyl ethers (PBDEs) have become ubiquitous environmental contaminants, particularly in mangrove wetlands. However, little is known about the long-term effect of mangrove plants on PBDE removal from contaminated sediments. A 12-month microcosm experiment was conducted to understand the effect of two mangrove species, namely Avicennia marina (Am) and Aegiceras corniculatum (Ac), on PBDE removal from the sediments spiked with 2000 ng g(-1) dry weight of BDE-47, and to explore the microbial mechanism responsible for the planting-induced effects on BDE-47 removal. Results showed that planting of mangrove species, either Am or Ac, could accelerate BDE-47 removal from contaminated sediments during the 12 months experiment, mainly through enhancing microbial degradation process. In particular, Am sediment had significantly higher BDE-47 degradation efficiency compared with Ac sediment, which may be mainly attributed to higher activities of urease and dehydrogenase, as well as higher 16S rRNA gene copies of total bacteria and organohalide-respiring bacteria (OHRB) in Am sediment. Moreover, planting could shift sediment bacterial community composition and selectively enrich some bacterial genera responsible for PBDE degradation. Such selective enrichment effect of Am on the potential PBDE-degrading bacteria differed distinctly from that of Ac. These results indicated that long-term planting of mangrove species, especially Am, could significantly promote BDE-47 removal from the contaminated sediments by enhancing microbial activity, increasing total bacterial and OHRB abundances and altering bacterial community composition. (C) 2016 Elsevier B.V. All rights reserved.