Effects of Emergent Hydrophytes on the Water Restoration of Wuliangsu Lake in Inner Mongolia

Abstract

In order to study the ability of emergent hydrophytes on the water restoration of Wuliangsu Lake in Inner Mongolia by chemical oxygen demand (COD), nitrogen and phosphorus, three macrophytes species (Typha latifolia L., Zizania latifolia Turcz. and Iris pseudacorus L.) were treated with various concentrations of TN/TP/COD (T1: 2.0/0.4/40 mg L−1, T2: 4.0/0.8/80 mg L−1 and T3: 320/60/8 mg L−1). The results showed that planting emergent hydrophytes were more effective at reducing concentrations of COD, total nitrogen (TN) and total phosphorus (TP) than unplanted. Under the same treatment, the removal of TN was the best after planting Zizania latifolia Turcz., and the removal of TP was the best after planting Iris pseudacorus L. The removal effect of COD on each planting emergent hydrophytes were about 50%. However, the difference between treatments is not significant.