Study on Establishment of Water Ecosystem of Outflow and Drainage Channels in Yanling Wetland

Mao Xuehui;Li Jing;Li Helong;Shenzhen Biyuan Environmental Protection Technic Co.Itd.;

water ecology construction;;rivers;;constructed wetland;;biomanipulation;;restoration of submerged plants

In view of the imperfect ecosystem of the Yanling artificial wetland in Dongguan City and the poor self-purification ability of the water body, based on the investigation of the water quality and water ecosystem of the wetland drainage channel, combined with the actual situation of the site, the technical plan was formulated. By setting up a dam, the water level of the river was reduced by pumping water;the snail removal project was controlledthe water ecosystem of the constructed wetland drainage channel was constructed by submerged plant planting project. The fish control and snail removal project has adopted the techniques of artificial fishing, setting fishing nets, tea platinum clearing ponds, biological manipulation, etc., each with advantages and disadvantages. The submerged plants adopt three kinds of planting methods, namely, planting trays, planting bags, and transplanting planting, and the growth of water plants with transplanting method and planting trough method is very good. After half a year of growth, the water quality of the wetland canal has been significantly improved; the submerged vegetation has been basically established; the foxtail algae have been covered with rivers and the roots of the bitter grass have spread and the water is clear and transparent. After the implementation of the project, the transparency of the river water body increased significantly, and the aquatic biodiversity and abundance increased significantly. The research results can provide reference for ecological management work similar to rivers.