s The species composition, productivity and its influence factors of aquatic macrophytes were estimated in saline-alkaline ponds in Zhaodian Fish Farm, Gaoqing County, Shandong Province, during from April to September in 1998.The results indicated that 12 species of the large aquatic plants were collected in this localities, common species were Potamogeton crispus , Zannichellia palustris, Nelumbo nucifera, Ceratophyllum demersum [Emergent vascular plants]; Phragmites communis, Scirpus yagara a...