将再生水用于城市河流补给引起了人们对其对水质和水生生态系统的影响的担忧。这项研究旨在揭示在补充再生水后正在进行实际水生态修复的城市河流中看到的改善情况。为期一年的水质监测,浮游植物,东沙河浮游动物在北京进行生态修复,中国。结果表明,与未恢复的河流相比,COD的浓度,NH4+-N,TP,TN下降28.22±7.88%,40.24±11.77%,44.17±17.29%,修复项目区占28.66±10.39%,分别。恢复区叶绿素a的浓度保持在40μg/L以下。在夏天,当藻类生长旺盛时,未恢复河流蓝藻的密度从46.84×104cells/L下降到恢复区域的16.32×104cells/L,绿藻的细胞从41.61×104cells/L降至11.87×104cells/L,分别减少了65.16%和71.47%,分别。优势浮游植物被芽孢杆菌取代,例如Synedrasp.和Nitzschiasp.,表明水生植物的恢复降低了蓝藻开花的风险。浮游动物种类在恢复区也发生了变化,尤其是在夏天。耐污染轮虫和原生动物密度分别下降31.06%和27.22%,而表明Cladocera的清水密度增加了101.19%。我们进一步计算了恢复区内外浮游植物和浮游动物的多样性和均匀度指数。结果表明,恢复区浮游植物和浮游动物的Shannon-Weaver指数分别为2.1和1.91,高于河流(1.84和1.82)。这进一步证实水生植物复原具有积极的感化。该研究可为我国其他再生水河流水生态修复工程的实施提供实践参考和理论依据。
The use of reclaimed water for urban river replenishment has raised concerns regarding its impact on water quality and aquatic ecosystems. This study aims to reveal the improvements seen in an urban river undergoing a practical water eco-remediation after being replenished with reclaimed water. A one-year monitoring of water quality, phytoplankton, and zooplankton was carried out in Dongsha River undergoing eco-remediation in Beijing, China. The results showed that compared to the unrestored river, the concentrations of COD, NH4+-N, TP, and TN decreased by 28.22 ± 7.88 %, 40.24 ± 11.77 %, 44.17 ± 17.29 %, and 28.66 ± 10.39 % in the restoration project area, respectively. The concentration of Chlorophyll-a in the restoration area was maintained below 40 μg/L. During summer, when algal growth is vigorous, the density of Cyanophyta in the unrestored river decreased from 46.84 × 104cells/L to 16.32 × 104cells/L in the restored area, while that of Chlorophyta decreased from 41.61 × 104cells/L to 11.87 × 104cells/L, a reduction of 65.16 % and 71.47 %, respectively. The dominant phytoplankton species were replaced with Bacillariophyta, such as Synedra sp. and Nitzschia sp., indicating that the restoration of aquatic plants reduces the risk of Cyanophyta blooms. Zooplankton species also changed in the restoration area, especially during summer. The density of pollution-tolerant Rotifer and Protozoa decreased by 31.06 % and 27.22 %, while the density of clean water indicating Cladocera increased by 101.19 %. We further calculated the diversity and evenness index of phytoplankton and zooplankton within and outside the restoration area. The results showed that the Shannon-Weaver index for phytoplankton and zooplankton in the restoration area was 2.1 and 1.91, which was higher than those in the river (1.84 and 1.82). This further confirmed that aquatic plant restoration has positive effects. This study can provide a practical reference and theoretical basis for the implementation of water ecological restoration projects in other reclaimed water rivers in China.