广州近郊水生维管植物群落的组成及分布

广州近郊的水生维管植物共有８４种，将它们划分为：挺水植物（４４种）群落，再分成硕大鹿艹草、短叶茳芏、菰等１０个群丛；浮叶及浮水植物（１８种）群落，再分成凤眼莲、浮萍和紫萍、小杏艹菜等７个群丛；沉水植物（２２种）群落，再分成苦草草、菹草、南方眼子菜等９个群丛；人工种植的水生植物（９种）群落，例如水稻、莲、荸荠等９个种．由于城市的扩建、荒废的池塘、水田及沼地的复垦，使得原供水生维管植物生长、繁殖的生境愈来愈少，物种的生存受到严重的威胁

Composition and Distribution of the Aquatic Vascular Plants Community in the Suburbs of Guangzhou

There are 84 species of aquatic vascular plants in the suburbs of Guangzhou,They are divided into:1.Emersed and standing plants community (44 species),containing(1)Scirpus grossus association.(2)Cyperus malaccensis var.brevifolius association.(3)Zizania latifoliaassociation etc.totalling to 7 associations.2.F loating and floating leaf (18 species),containing(1)Eichhornia crassipes association.(2)lemn minor+Spirodela schleid association.(3)Nymphoides coreana association etc.totalling to 7 associtations.3.Submerged plants communi+ty (22 species),containing (1) Vallisneria denseserrulata +V.asiatica association.(2)Potamogeton crispus association.(3)Potamogeton octandrus association etc.totalling to 9 associations.4.Cultivated plants community (9 species)like Oryza sativa,Zizania latifolia,Eleocharis dulcis,Nelumbonucifera etc.Because of extension of the urban areas of Guangzhou city and the renewal of deserted ponds,paddy fields and marshlands,the ecological conditions for aquatic vascular plants are becoming worse and their growth and reproduction are seriousl threatened.