Abstract: Both the present state and long-term changes of aquatic plant diversity in Changhu Lake, the third largest lake of Hubei Province in China, were studied in the paper. The reasons for the diversity loss and effective approaches to restore the degraded aquatic plant diversity and lake ecosystem were discussed.

Key words: Aquatic plants

摘要： 研究了湖北省第三大湖泊长湖水生植物多样性的现状及其长期变化，并探讨了多样性丧失的机理及多样性恢复与保护的有效途径。主要结论：(1)长湖现有水生植物98种，多度最大的是微齿眼子菜(Potamogeton maackianus)、密齿苦草(Vallisneria denseserrulata)、野菱(Trapa incisa)、双角菱(T.bispinosa)、菹草(Potamogeton crispus)、紫萍(Spirodela polyrhiza)、穗花狐尾藻(Myriophyllum spicatum)、轮叶黑藻(Hydrilla verticillata)、满江红(Azolla imbricata)。(2)长湖现有水生植物群丛类型14个，群落物种多样性指数最高的是芡实+野菱+双角菱群丛 (Euryale ferox+Trapa incisa+T.bispinosa Ass.)，其次为轮叶黑藻+密齿苦草+大茨藻群丛 (Hydrilla verticillata+Vallisneria denseserrulata+Najas marioa Ass.) 与竹叶眼子菜+穗花狐尾藻群丛 (Potamogeton malaianus+Myriophyllum spicatum Ass.)。

关键词: 水生植物, 物种多样性, 群落多样性