School of Civil Engineering, Sun Yat-Sen University, Zhuhai, 519082, China.
State Environmental Protection Key Laboratory of Source Water Management and Technology, Shenzhen Academy of Environmental Sciences, Shenzhen, 518001, China.
Environ Sci Pollut Res Int. 2021 Oct;28(40):56507-56521. doi: 10.1007/s11356-021-14628-5. Epub 2021 May 31.
Like the blood vessels of the cities, urban rivers play a significant role on maintaining the cities' sustainable development. In addition to the prevention of pollutants discharge and improving the river water quality, the restoration of the urban rivers' ecosystem should be well concerned. To fill this gap, a pilot-scale study with constructed bypass channel (CBC) was conducted. The pollutants reduction by the aquatic plants of the CBC was evaluated, and the similarities/differences of the aquatic biodiversity between the CBC and the natural rivers were analyzed. The results indicated that the mean removal efficiency of TP, NH-N, TN, and COD by the CBC was 66%, 60%, 52%, and 36%, respectively. Chlorophyta, Bacillariophyta, and Cyanophyta were the dominant phytoplankton phyla in the CBC which was in accordance with the studies conducted in the Dongjiang River and the Pearl River. During the study period of about 6 months, the population density and the biomass of the phytoplankton and the zooplankton increased over time. The quality of the influent dominated the aquatic organisms' diversity of the CBC. N-element dominated not only the phytoplankton variability, but also the bacterial species of the CBC. The timber pile and the submerged plant root soil were more suitable for the growth of the functional bacteria; thus, the construction of the river restoration infrastructures should avoid using large-scale cement materials. Overall, the study would improve the understanding of urban river restoration practice and provide guidance for future restoration practice especially from the aquatic ecological perspectives.
与城市血管类似，城市河流对维持城市可持续发展起着重要作用。除了防止污染物排放和改善河流水质外，还应高度关注城市河流生态系统的恢复。为了填补这一空白，进行了一项带有构造旁路渠道（CBC）的试点研究。评估了 CBC 中水生植物对污染物的去除效果，并分析了 CBC 与自然河流之间水生生物多样性的相似性/差异性。结果表明，CBC 对 TP、NH-N、TN 和 COD 的平均去除效率分别为 66%、60%、52%和 36%。CBC 中的优势浮游植物门类为绿藻门、硅藻门和蓝藻门，这与东江和珠江的研究结果一致。在大约 6 个月的研究期间，浮游植物和浮游动物的种群密度和生物量随着时间的推移而增加。进水质量主导着 CBC 中水生生物的多样性。N 元素不仅主导着浮游植物的变化，也主导着 CBC 中的细菌种类。木桩和淹没植物根土更适合功能细菌的生长；因此，在河流修复基础设施的建设中应避免使用大规模的水泥材料。总的来说，该研究将提高对城市河流修复实践的理解，并从水生生态角度为未来的修复实践提供指导。
