The combinations of the various aquatic plants showed good maintainability in water garden . the concentrations of tp , tn were kept lower effectively in the experimental pool ii ( planted with emersed aquatic plants ) and pool en ( floating and floating leaf aquatic plants and submerged aquatics ) the concentration of tp and tn was relatively higher in pool i which only planted with potamogeton crispus 用挺水植物和浮叶、漂浮植物组成的试验池及用挺水植物、浮叶和漂浮植物、沉水植物组成的试验池比由菹草组成的单一层次结构的试验池更能有效地维持水体tp 、 tn含量，其景观也更为丰富。
