中文摘要：

2009年开展了洱海流域水生被子植物区系研究,共发现38科、76属、100种。从科、属、种3个层面看,热带类群占显著优势,这与洱海流域所处的气候带相一致。世界分布种多为建群种和优势种。对比以前的调查结果,洱海流域水生植物资源显著退化,物种多样性显著下降,特别是特有种和珍稀濒危物种匮乏,仅有1种;外来入侵种呈进一步扩大趋势。针对以上特点,预测洱海流域水生被子植物未来从数量和种类上将进一步减少,入侵种危害程度将进一步扩大,对流域的生态保护迫在眉睫。

英文摘要：

Flora of aquatic angiosperm in wetland of Erhai Lake Basin was investigated in 2009.One hundred species of 76 genera in 38 families were found in this investingation.At family,generic and species levels,the dominant taxonomic group was tropical origin.This result was consistent with the climatic zone of this area.Besides,few endemic and endangered species but several invasive species of this area were found in the present study,indicating there was a dangerous situation of aquatic angiosperm in wetland of Erhai Lake Basin.