南京南湖底泥疏浚后水质演化规律调查

对疏浚后的南京南湖底泥的TP、TN和COD释放规律、补水后的水质状况以及藻类演替规律进行了调查。结果表明,上覆水中TP平均质量浓度基本不随自来水补入量的增加而发生变化,TN和COD质量浓度随自来水补入量的增加而增大;水体中的TP、TN和COD含量总体呈上升趋势;从2005年3月中旬起,出现藻类的大量繁殖,在2005年7月发生水华,藻类优势种由裸藻、隐藻和小环藻演替为裸藻、栅藻和韦斯藻,藻类总量由2005年3月的3.7×106L-1上升到2006年4月的1.5×107L-1。

Assessment for Water Quality Change after Sediment Dredging of South Lake in Nanjing

TP,TN and COD release,refilled water quality and algae change were investigated after sediment dredging for South Lake of Nanjing.The results showed that average concentration of TP in the water had not changed but average concentrations of TN and COD increased after the refilled water.The concentrations of TP,TN and COD were rising.From the March of the year 2005,a large number of algae reproduced.Algal bloom happened in the July of the year 2005 and dominant species of alga community changed from euglena,cryptomonas,cyclotella to euglena,scenedesmus and wes algae.The algae concentration increased from 3.7×106 L-1in the March of the year 2005 to 1.5×107 L-1 in the April of the year 2006.