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Shan Zhenguang;LiJialian(Department of Biology,Yunnan Normal University)  
The Chenghai lake is located on the boundaries of yongsheng county of northwestYunnan province.There are 14 species of seed plant, amoung which there are 4 species ofsubmersedplant.Acording to the life form, dominant species and main species composition of plants,we recog-nized vegetation types as follows: 1.Veronica anagallis aquatica+Polypogon fugax community. 2.Ranunculus sceleratus+Polypogon fugax community.3.Nasturtium officinale community. 4.Potamogeton crispus community.5.Scirpus planiculmis community. 6.Scirpusplaniculmis+Myriophyllum verticillatum+Potamogeton pectinatus community.7.Potamogetonpectinatus community.8. Myriophyllum vertcillatum+Myrioplyllum certicillatum+potamogetonpectinatus community.9.Myriophyllum verticillatum community.10.Myriophyllumverticillatum+Vallisneria spiralis community.11.Vallisneria spiralis community. 12.Chara sp.com-munity.The biomass of Chenghai lake is about 4766t,among which submersed plant communitiesare 94,1%, The kinds ofseed plant is poor,biomass is low in Chenghai lake. It is because Chenghailake is the depth water lake ofalkalinity and microsalt water.
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