人工调控措施对玄武湖水质的影响

对玄武湖实施清淤引水、藻华治理、种群恢复等措施前后的水体数据进行分析，结果表明：清淤引水工程可短时间内降低沉积物中污染物浓度，缓解水体富营养化程度，但从长期效果分析，水体中的营养盐含量并未显著改善.藻华治理能在短期内有效抑制水体中的蓝藻水华，治理后水体各项指标均有提升，水生植物种群得以恢复，是短期改善水体水质的有效方式.在种群恢复阶段与往年相比，水体各项指标均有所改善，持续时间更长，是一种理想的湖泊治理方法.

Artificial control effects on water quality of Xuanwu Lake

In order to control the eutrophication, some artificial control measures were employed in Nanjing''s Xuanwu Lake, including dredging and diluting with diversion works, controlling algae bloom, and aquatic population restoration.The lake water quality before and after these measures were compared using monitoring data.Results show that the dredging and diluting could reduce the concentration of pollutants in sediments and alleviate the eutrophication temporarily, yet the nutrient salt contents in the lake were not distinctly reduced.In the short term, control measure of algal blooms could effectively inhibit the cyanobacterial bloom, improve water quality and restore the aquatic population, thus is an effective way to control eutrophication in emergency conditions.While the water quality was improved distinctly during the aquatic population recovery stage, compared with that in previous years, indicating the aquatic population restoration is a sustainable and effective method for the lake management and eutrophication control.