STUDY OF COMMUNITIES OF AQUATIC VASCULAR PLANTS IN HONGYUAN COUNTY OF SICHUAN PROVINCE

Hongyuan County is located in east margin region of Qinghai-Xizhang Plateau, and located in 31°5l'～33°20'N, 101°51'～103°2l'E, 12 aquatic plant communities distribut in the area. They are Co,Carex muliensis,Co. Carex pamirensis,Co. Equisetum flaviatile,Co Sparganium stoloniferum,Co.Catabrosa aquatica,Co.Beckmannia syziachne,Co.Myriophyllum spicatum, Co. Potamogeton crispus,Co. Potamogeton pectinatus, Co. Callitriche palustris. The above communities contain 45 species of aquatic vascular plants,North Temperate communities are main community in the area.