Purification Ability of Different Grasses to Eutrophic Water During the Cold Season Study on Purification Effect of Paspalum distichum L. on Swine Wastewater Biological response of Iris pseudacorus leaf and its effect on water purification Ecosystem services’ spatial characteristics and their relationships with residents’ well-being in Miyun Reservoir watershed Cutting effects on growth and wastewater purification of Cyperus alternifolius in constructed wetland Design and purification performance of vertical flow constructed wetland