Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing 210098, China.
Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing 210098, China.
Bioresour Technol. 2020 Dec;318:124058. doi: 10.1016/j.biortech.2020.124058. Epub 2020 Aug 31.
The mechanisms behind water flow on contaminant removal by a submerged macrophyte-biofilm complex in surface flow wetlands remain to be fully elucidated. In this study, water flow (2.02 ~ 2.12 or 4.06 ~ 4.5 L s; hydraulic retention time, 7d) significantly enhanced NH-N and COD but inhibited TN and TP removal compared to the static ones. No more than 30% of TN and TP were assimilated by V. natans-biofilm complex in wetland system. Water flow remarkably affected alpha-diversity of microbial community in epiphytic biofilm. As revealed by beta-diversity analysis, turnover played greater contribution to the total dissimilarity than nestedness. Network analyses revealed that the microbial interactions including predation, symbiosis and competition in epiphytic biofilms were much more intensive in the Sept.- Oct. than the Nov.-Dec group. Redundancy and Mantel correlation analyses revealed that temperature played a key role in determining microbial community structure, especially for bacteria.
在表面流湿地中，淹没的大型植物-生物膜复合体去除污染物的水流机制仍有待充分阐明。在这项研究中，与静态条件相比，水流（2.022.12 或 4.064.5 L/s；水力停留时间为 7d）显著增强了 NH-N 和 COD 的去除，但抑制了 TN 和 TP 的去除。湿地系统中，水鳖-生物膜复合体对 TN 和 TP 的同化作用不超过 30%。水流对附生生物膜中微生物群落的 alpha 多样性有显著影响。通过 beta 多样性分析表明，周转率对总差异的贡献大于嵌套性。网络分析表明，附生生物膜中的微生物相互作用包括捕食、共生和竞争，在 9 月-10 月比 11 月-12 月更为激烈。冗余和 Mantel 相关分析表明，温度在决定微生物群落结构方面起着关键作用，尤其是对细菌。
