关键词: 水生植物, 富营养化, 水体, 净化

Abstract: In order to study the purification effect of aquatic plants on eutrophic water body, three aquatic plants, including Cyperus involucratus (A), Myriophylium spicatum (B), and Sparganium stoloniferum (C), were selected. Plant combinations of single, 2 or 3 species were used by simulating eutrophication water body in laboratory. The eutrophication indexes of total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) were measured. The results showed that the removal rates of ABC combination on TN, TP and COD in eutrophic water were 98.64%, 98.36% and 95.49%, respectively. With the increase of treatment time, the removal rates of TN, TP and COD in eutrophic water increased. With the increase of treatment time, the removal rates of TN,TP and COD in eutrophic water increased. At 36 d, the removal rates of TN, TP and COD in eutrophic water were significantly higher in ABC combination than those in AB,AC and BC combinations, and the later were significantly higher than those in A, B and C combinations. There were significant differences between AB, BC and AC groups in TN unit removal ability and COD unit removal ability. The results showed that under the same planting density, the removal of total nitrogen, total phosphorus and chemical oxygen demand in eutrophic water by three different aquatic plant combinations was higher than that of two different aquatic plant combinations. The purification effect of two different aquatic plant combinations was better than that of single aquatic plant. The results provided theoretical reference and application guidance for eutrophication purification of aquatic plants.

Key words: aquatic plants, eutrophication, water, purification