| 太湖出流河道藻颗粒变化及其水质效应 |
| 摘要点击 2019 全文点击 812 投稿时间：2020-05-23 修订日期：2020-07-09 |
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| 中文关键词 连通河道 调水工程 蓝藻水华 颗粒态叶绿素a 颗粒态有机物交换通量 |
| 英文关键词 connected rivers water diversion project cyanobacteria bloom particulate chlorophyll a exchange flux of particulate organic matter |
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| 中文摘要 |
| 河湖连通是保障城市水体水生态健康的一种常用工程手段，但对于蓝藻水华严重的湖泊，湖泊出流携带的藻团颗粒会对河道水质产生明显的影响.为了分析富营养化湖泊引水对受水河道水质的影响程度，以太湖梅梁湾连通河道梁溪河为例，连续3a开展夏季河道蓝藻颗粒通量及其水质的高频监测，分析河道蓝藻水华颗粒物通量变化规律及其对河道水质的影响强度.结果表明：①梅梁湾藻情的好转及河道入口加压抑藻井运行显著降低了梁溪河的叶绿素a浓度与藻颗粒通量，2019年夏季河道叶绿素a浓度与通量均值分别为54.34 μg·L-1和84.7 t·d-1，显著低于2017年；②连通河道调水工程对改善受水水体的水质效果显著，除DTP外，梁溪河其余各形态氮、磷浓度2017~2019年整体呈下降趋势，说明调水工程将湖水外排后，对梁溪河水质有一定改善效果；③携带大量蓝藻水华颗粒物的湖水进入河道后，显著增加了河道颗粒态氮、磷等营养盐含量，2017~2019年梁溪河水体中氮、磷均以PN和PP为主，分别占TN和TP的62.5%和70.8%；④梅梁湾水体大量携带的藻颗粒未对连通的京杭大运河等其他河道产生水质影响，2019年8月京杭大运河水体中叶绿素a相较于6月下降了65%，说明蓝藻颗粒物未在运河中积累；⑤在湖泊藻情未能得到有效改观的前提下，调水携带的藻颗粒态会对连通河道局部河段水质和景观产生冲击. |
| 英文摘要 |
| Connected rivers are a common engineering method to ensure the ecological health of urban water. However, for the lakes with serious cyanobacteria blooms, the algal particles are carried by the outflow of the lake and will have a significant impact on water quality. The location at which the Liangxi river meets Meiliang Bay of Lake Taihu was selected to explore the influence of the eutrophic lake on the connected rivers, and high-frequency monitoring was conducted in summer for three consecutive years to analyze the changes in the flux of cyanobacterial bloom particles in rivers and their impact on river water quality. The results show that:① The improvement of the algal cyanobacteria bloom in Meiliang Bay and the operation of the pressure-controlled algae well at the entrance of the river significantly reduced the concentration of chlorophyll a and the flux of algae particles in the Liangxi River. The average value of the concentration of chlorophyll a and the flux of algae particles in the river in summer 2019 were 54.34 μg·L-1 and 84.7 t·d-1, respectively, and significantly lower than those of 2017; ② Water diversion had a significant effect on improving the water quality of the receiving water. Except for DTP, the nitrogen and phosphorus concentrations of the remaining forms of the Liangxi River showed a downward trend from 2017 to 2019, indicating that the water quality of the Liangxi river improved after water transfer; ③ A large amount of cyanobacterial blooms entering the channel significantly increased the particulate nitrogen and phosphorus content of the water. From 2017 to 2019, the nitrogen and phosphorus in the Liangxi River were mainly PN and PP, accounting for 62.5% and 70.8% of TN and TP, respectively; ④ The water quality of the Beijing-Hangzhou Grand Canal and other connected rivers has not been affected by the algal particles in Meiliang Bay. In August 2019, the chlorophyll a content in the canal water decreased by 65% compared with that of June, indicating that cyanobacterial bloom particles have not accumulated in the Grand Canal; ⑤ On the premise that the cyanobacteria bloom in the lake has not been effectively improved, the algae particles carried by the water diversion will have an impact on the water quality and landscape of the local reach connecting the river. |
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