种植密度对绿萝浮床净化富营养水体效果的影响

eutrophication;  font-size: 10pt; ">ecological floating bed;  font-size: 10pt; ">Epipremnum aureum; planting density

为获取浮床植物治理富营养化水体的最优种植密度，在室外条件下选取有观赏价值和绿化作用的植物绿萝作为浮床植物，以自行设计组装的生态浮床作为植物载体，对由湖水加一定量营养元素配制的富营养化污水进行为期39 d的处理，考察植物生长情况和对各污染物 的净化效果。结果表明，溶解性磷（DP）、TN、TOC、电导率(COND)的下降率与种植密度呈正相关，种植密度越大，植物质量增加比例越小、水箱内叶绿素a(Chl-a)浓度和藻密度越小；Chl-a浓度与藻密度变化趋势一致，两者具有显著的相关性。试验条件下的最佳种植密度为3.13 g/L，对TN、TOC的去除率分别为96.8%和84.6%，种植密度过高，处理效果提高不明显。

In order to determine the optimal planting density of floating bed plants treating eutrophic water bodies, eutrophic wastewater prepared with lake water and a certain amount of nutrients was treated by a floating bed for 39 d, and the growth of plants and the purification effect of various pollutants were investigated. Epipremnum aureum, which has ornamental value and greening function, was selected as the floating bed plant under the outdoor conditions, and a self-designed and assembled ecological floating bed was used as a plant carrier. The decrease rates of DP, TN, TOC and conductivity (COND) had a positive correlation with the planting density. The higher the planting density was, the lower the increase rate in plant weight was observed, and the lower the chlorophyll a (Chl-a) concentration and algae densities in the water tank were detected. Profile of the algae density was consistent with that of Chl-a concentration, and a significant correlation existed between them. The optimal planting density was 3.13 g/L in the experiment, and the removal rates of TN and TOC were 96.8% and 84.6%, respectively. The improvement of treatment efficiency was not obvious if the planting density was too high.