Adaptability of submerged macrophytes to water environment in Beijing rivers

Submerged macrophytes are important ecosystem founders for the restoration of degraded aquatic environment.The investigation of submerged macrophytes adaptabilities to the environment in rivers with different pollution degrees is of great value for the establishment of vegetation restoration strategies.Field surveys for submerged macrophytes were carried out at 36 different rivers sites in Beijing.A total of 15 submerged macrophytes species was recorded.Principal component analysis(PCA) indicated that ammonia nitrogen,total nitrogen and total phosphorus in the water body were the most important influence factors for the distribution of submerged macrophytes.Canonical correspondence analysis(CCA) illustrated that the distributions of submerged macrophytes was mainly influenced by the chemical nutrients concentration and the transparency of water body.Comprehensive analysis determined that submerged macrophytes had different adaptation ranges to water quality.Charophyceae,Hydrilla verticillata and Potamogeton malaianus were usually adaptive to clean water,Ceratophyllum demersum was widely distributed species,and Potamogeton pectinatus and Potamogeton crispus were tolerant species.