北京怀沙河、怀九河水生植物区系初步研究

对北京怀沙河、怀九河水生植被的种类组成、分布区类型以及植被类型进行了调查.结果表明:该区共有水生植物16科18属24种;分布区类型以世界广泛分布成分最多,其次为北温带分布;水生植被分为沉水、浮水和挺水3个植被亚型和香蒲群落、慈菇群落、满江红群落、水毛茛群落、豆瓣菜群落等13个群系.

Aquatic Vegetation in Huaishahe River and Huaijiuhe River of Beijing

The species compositions,distribution types and vegetation types of aquatic plants in Huaishahe River and Huaijiuhe River of Beijing were surveyed.There were 24 species of aquatic plants belonging 18 genera 16 families in the area.The genera of aquatic plants could be classified into 5 distribution types,in which cosmopolitans elements took dominate position and made account for 58.8%,north temperate elements occupied the second position and make account for 17.6%.The aquatic vegetation could be classified into emergent subtype,floating-leaved subtype and submergent subtype,including 13 main plant communities.