【摘要】 在人工模拟自然条件下,对水生植物千屈菜（Lythrum salicaria）、小香蒲（Typha minima）、水葱（Scirpus validus）、黄花鸢尾（Iris wilsonii）及其不同组合配置的水质净化效果进行了研究。结果表明:试验的各水生植物及其组合配置在总氮、硝态氮、总磷、正磷酸盐和化学耗氧量(TN、NO₃^-、TP、PO₄^3-、COD)上有净化效果,配置种植的净化效果优于单一种植。研究给出了各水质指标随时间变化的回归方程。千屈菜+黄花鸢尾组合50 d TN去除率和COD降低率分别为73.83%,77.4%,水质净化效果最佳;水葱+黄花鸢尾组合20 d NO₃^-去除率为89.41%;水葱+黄花鸢尾组合对总磷和PO₄^3-去除效果最好,50 d去除率分别达88.98%和92.39%,合理选用适应当地生态条件的水生植物及其组合配置,可用于河道水质改良。更多还原

【Abstract】 Water purification effects of aquatic plants（Lythrum salicaria, Typha minima, Scirpus validus, Iris wilsonii） and their different configurations were analyzed under artificial simulated natural conditions. The result showed that each of the aquatic plants and their configurations possessed purifying effects on the water quality indexes(TN, NO₃^-, TP, PO₄^3-and COD), and the purification effects of the configurations were better than the single. The regressions with higher correlations between removal rate and time were given. The removal rate of TN and COD reduced rate of Lythrum salicaria and Iris pseudoacorus combination were 73.83% and 77.4% in 50 days, which possessed the best effect on water purification. The NO₃^-removal rate of Scirpus and Iris pseudoacorus combination could reach 89.41% in 20 days. Scirpus and Yellow iris combination had the best effect on removing TP and PO₄^3-, with the removal rates up to 88.98% and 92.39% in 50 days. Reasonable choice of local aquatic plants and their optimal combinations can be applied in the improvement of water quality in rivers.更多还原