生态悬床技术对白洋淀水环境修复效果的研究

Effect of ecological suspended bed measures on water environment restoration in Baiyangdian Lake

为解决白洋淀深水区沉水植被恢复的问题,开发了一种由水生植物、绳索及支撑杆构建的生态悬床。生态悬床可根据水位变化调整在水体中的上下位置,2019年7月—2019年11月连续测定悬床周围水体中水质状况,研究了悬床种植沉水植物对湖泊深水区氮磷营养盐的净化效果。结果显示:狐尾藻在悬床上生长良好,并能有效地降低水体中的氮磷营养盐;试验开始一个月后,悬床周围水体总氮、总磷、亚硝酸盐氮去除率分别为40.54%、53.45%、99%;试验结束时,悬床周围水体总氮、亚硝酸盐氮和化学需氧量(COD)质量浓度分别比试验开始时下降了12.43%、33.93%、17.09%。研究表明:悬床种植沉水植物可有效解决沉水植物生长光照不足的问题,是北方藻型湖泊恢复沉水植被的有效措施之一。

In order to solve the problem of submerged vegetation restoration in deep water area of Baiyangdian Lake,an ecological suspended bed constructed by aquatic plants,ropes and supporting rods was developed.The position of the ecological suspended bed can be adjusted according to the change of water level.Through monitoring of water quality around the suspended bed from July 2019 to November 2019,the purification effect of submerged plants on the suspended bed on nitrogen and phosphorus nutrients in deep water area of lake was studied.The results showed that Myriophyllum grows well on the suspended bed,and could effectively reduce the nitrogen and phosphorus nutrients in the water body.One month after the start of the experiment,the removal rates of total nitrogen,total phosphorus and nitrite nitrogen in the water around the suspended bed were 40.54%,53.45%a nd 99%,respectively.At the end of the experiment,the total nitrogen,nitrite nitrogen and COD decreased by 12.43%,33.93%and 17.09%respectively compared with those at the start of the experiment.The study shows that submerged plants on the suspended bed can effectively solve the problem of insufficient light for submerged plant growth,making it one of the effective measures to restore submerged vegetation in northern algal lakes.