Research on Decontamination, Algae Inhibition, and Pollution Resistance of Emergent Plant System in Eutrophic Water

Abstract

With the development of cities and economic growth, the eutrophication of urban park landscape water has become a hot topic in environmental governance and research at home and abroad. Through the simulation experiment of water pollution, the effect of plant micro system built by aquatic plant on the ability of algae suppression in eutrophic water was studied. The results show that the micro system formed by different types of water plant can be reduced and stabilized the pH value of the rich and enriched water bodies. The pH of Lythrum salicaria L. group (Q) and Iris tectorum Maxim group (Y) group is the lowest. They are 7.34 and 7.48, which is significantly lower than the plant less group (CK). Different treatments have effectively reduced the nitrogen and phosphorus content in the water body. At the end of the experiment, the total nitrogen content of Y dropped from 9.49 to 3.21 mg∙L− 1, and the removal rate reached 66.2%; the total phosphorus removal rate of the water body phosphorus of different types of aquatic plants was 59.1%⁓81.3%, which was significantly higher than that of CK. Among them, the total phosphorus removal rate of Y treatment is the best, and it is significantly different from the CK. At the end of the experiment, chl a content in group Y was the lowest which was 6.6 mg∙L− 1. It decreased by 37.1% and 54.1% compared to the initial value and CK, respectively. It showed significant differences compared to other treatments (P < 0.05). At the same time, the content of proline and malondialdehyde in plants of Y, Q, and Nelumbo SP. group(H) significantly increased in eutrophic water, with group Y plants showing the highest increase, with increases of 28.6% and 39.8%, respectively. Different micro-systems formed by different water plants can improve water quality conditions and inhibit the reproduction of algae in the water. Among them, the effect of planting Iris tectorum Maxim group is the best.