附着在沉水植物上的生物膜在改善补充再生水的水环境的水质中起着重要作用。为了探讨再生水质和沉水植物对附生细菌群落特征的影响,本研究选取不同类型的沉水植物作为研究对象。采用16SrRNA高通量测序技术对附生细菌及周围环境样品进行细菌群落结构和功能基因分析。结果表明,在补充再生水的水环境中,约有20%-35%的氮磷养分被吸收和利用。然而,COD,浊度,下游水的色度显著增加。附着在沉水植物上的生物膜的细菌群落与周围环境(土壤,沉积物,和水体)以及经过再生水处理的活性污泥中。就细菌群落多样性而言,丰富度和多样性显著低于土壤和沉积物,但高于水体中浮游生物细菌。就细菌群落组成而言,优势属和相应的丰度也与其他样品不同。主要优势菌属为鞘氨醇单胞菌,气单胞菌,假单胞菌,和不动杆菌,占7%-40%,分别。大型植物物种和再生水的质量(BOD5,TN,NH4+-N,和TP)可能会影响细菌群落。然而,细菌群落对水质的影响大于大型植物。此外,再生水的质量也影响了细菌群落中功能基因的丰度,氮磷循环功能基因的相对丰度在氮磷浓度较高的地区较高。
Biofilms attached to submerged macrophytes play an important role in improving the water quality of the water environment supplemented with reclaimed water. In order to explore the effects of reclaimed water quality and submerged macrophyte species on the characteristics of an epiphytic bacterial community, different types of submerged macrophytes were selected as research objects in this study. 16S rRNA high-throughput sequencing technology was used on the epiphytic bacteria and the surrounding environmental samples to analyze the bacterial community structure and functional genes. The results showed that approximately 20%-35% of the nitrogen and phosphorus nutrients were absorbed and utilized in the water environment supplemented with reclaimed water. However, the COD, turbidity, and chroma of the downstream water were significantly increased. The bacterial community of the biofilms attached to submerged macrophytes was significantly different from that in the surrounding environment (soil, sediment, and water body) and in the activated sludge that was treated by reclaimed water. In terms of bacterial community diversity, the richness and diversity were significantly lower than those of soil and sediment but higher than those of plankton bacteria in water. In terms of bacterial community composition, dominant genera and corresponding abundances were also different from those of other samples. The main dominant bacterial genera were Sphingomonas, Aeromonas, Pseudomonas, and Acinetobacter, accounting for 7%-40%, respectively. Both macrophyte species and the quality of reclaimed water (BOD5, TN, NH4+-N, and TP) could affect the bacterial community. However, the effect of water quality of the bacterial community was greater than that of macrophytes species. Additionally, the quality of reclaimed water also affected the abundance of functional genes in the bacterial community, and the relative abundance of nitrogen and phosphorus cycling functional genes was higher in areas with higher nitrogen and phosphorus concentrations.