STUDY OF COMMUNITIES OF AQUATIC VASCULAR PLANTS IN GANZHI COUNTY IN QINGHAI-XIZANG PLATEAU

Ganzhi County is located in east margin region of Qinghai-Xizhang Plateau,and located in 31°20'～32°50'N,99°10'～102°20'E.11 aquatic plant communities distribute in the area,that are Co.Triglochin palustre-Potamogeton cristatus, Co.Triglochin maratinum, Co.Hippuris vulgaris, Co.Alopecurus aequalis, Co.Polygonum sibiricum,Co.Scirpus tabernamontani, Co.Polygonum amphibium-Nymphoides pallatum, Co.Carex pamirensis, Co.Potamogeton pectinatus, Co.Potamogeton crispus, Co.Myriophyllum spicatum.Above communities contain 26 species of aquatic vascular plants.Community dominanties almost all are North Temperate plants.