School of Environment and Energy, Shenzhen Graduate School of Peking University, Shenzhen, 518055, Guangdong, China.
School of Environment and Energy, Shenzhen Graduate School of Peking University, Shenzhen, 518055, Guangdong, China.
Chemosphere. 2020 Feb;240:124873. doi: 10.1016/j.chemosphere.2019.124873. Epub 2019 Sep 14.
Combined pollution caused by polybrominated diphenyl ethers (PBDEs) and polycyclic aromatic hydrocarbons (PAHs) in mangrove wetlands is serious, with their remediation to be been paid more and more attention. However, little is known about the combined impact of PAHs and mangrove species on removal of PBDEs in contaminated soils. In this study, BDE-209 and pyrene were selected and a 9 months experiment was conducted to explore how BDE-209 removal in contaminated soil varied with pyrene addition and Kandelia obovata planting, and to clarify corresponding microbial responses. Results showed that BDE-209 removals in soil induced by pyrene addition or K. obovata planting were significant and stable after 6 months, with the lowest levels of BDE-209 in combined pyrene addition with K. obovata planting. Unexpected, root uptake of BDE-209 in K. obovata was limited for BDE-209 removal in soil, which was verified by lower total amount of BDE-209 bioaccumulated in K. obovata's root. In soil without K. obovata planting, BDE-209 removal caused by pyrene addition coexisted with changed bacterial abundance at phylum Planctomycetes and Chloroflexi, class Planctomycetacia, and genus Blastopirellula. K. obovata-induced removal of BDE-209 in soil may be related to bacterial enrichment in phylum Proteobacteria, class Gammaproteobacteria and genus Ilumatobacter, Gaiella. Thus, in BDE-209 contaminated soil, microbial community responses induced by pyrene addition and K. obovata planting were different at phylum, class and genus levels. This is the first study demonstrating that pyrene addition and K. obovata planting could improve BDE-209 removal, and differently affected the corresponding responses of microbial communities.
多溴二苯醚 (PBDEs) 和多环芳烃 (PAHs) 在红树林湿地中的复合污染较为严重，其修复工作受到越来越多的关注。然而，对于 PAHs 和红树林物种对污染土壤中 PBDEs 去除的联合影响知之甚少。在这项研究中，选择 BDE-209 和芘进行了 9 个月的实验，以探索 BDE-209 在受污染土壤中的去除率如何随芘的添加和白骨壤（Kandelia obovata）种植而变化，并阐明相应的微生物响应。结果表明，添加芘或白骨壤种植后，土壤中 BDE-209 的去除率在 6 个月后显著且稳定，其中添加芘与白骨壤种植的联合作用下 BDE-209 的去除率最低。出乎意料的是，白骨壤对 BDE-209 的根吸收对土壤中 BDE-209 的去除有限，这从白骨壤根中累积的 BDE-209 总量较低得到验证。在没有白骨壤种植的土壤中，芘添加引起的 BDE-209 去除与土壤中拟杆菌门（Planctomycetes）和绿弯菌门（Chloroflexi）、拟杆菌纲（Planctomycetacia）和 Blastopirellula 属的细菌丰度变化共存。白骨壤诱导的土壤中 BDE-209 的去除可能与变形菌门（Proteobacteria）、γ-变形菌纲（Gammaproteobacteria）和 Ilumatobacter 属、Gaiella 属细菌的富集有关。因此，在 BDE-209 污染土壤中，芘添加和白骨壤种植引起的微生物群落响应在门、纲和属水平上是不同的。这是首次表明，芘添加和白骨壤种植可以提高 BDE-209 的去除率，并对相应的微生物群落响应产生不同的影响。
