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Purification efficiency of three aquatic macrophytes on Jialu river

Three aquatic macrophytes including Rumex dentatus Linn., Ranunculus sceleratus Linn. and Rorippa palustris Leyss (Bess.) were selected as materials for investigating their purifiction efficiencies by analyzing pH value, total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (CODCr) of the eutrophicated water from Jialu river. The results indicated that the three species had different degrees of purification efficiency of Jialu river. The magnitude order of the ability of reducing the water pH value and total removal rates of TN, TP and CODCr was R. dentatus > R. sceleratus > R. palustris. The biomass increment of the three plants closely related to the purification efficiency. In spring R. dentatus and R. sceleratus had a stronger comprehensive decontamination ability than R. palustris, which were the dominant species of in-situ remediation in Jialu river.