贾鲁河梯级河滩湿地冬季植被构建及净化效果研究

在地处黄河之滨的河南郑州建设运行梯级河滩湿地净化贾鲁河水，技术示范工程在2009年夏、秋季节取得了良好的水质净化效果，为了验证冬季沉水植物对水质净化的效果，用菹草、伊乐藻、西伯利亚鸢尾等耐低温植物组建冬季湿地植被，研究了冬季植被的发育情况和水质净化效果.结果表明，菹草和伊乐藻这两种沉水植物能够在冬季湿地中成活并发育形成...

Winter vegetation composition and the purification effect of a cascaded wetland along the Jialu River

A cascaded surface-flow constructed wetland with a total area of 7400 m², was constructed along the Jialu River floodplain in Zhengzhou city of Henan province. The substrate was high viscosity silt loam. The purification effect of the cascaded wetland was excellent in summer and autumn of 2009, then winter vegetation was composed with Potamogeton crispus, Elodea canadensis and Iris sibirica and the vegetation development and purification effect were observed continuously. Potamogeton crispus and Elodea canadensis survived and vegetation coverage stood at 50%. Iris sibirica all survived and issued new leaves. Our results indicated that the average removal rates of nitrogen, phosphorus, ammonia and COD_Cr were 32%, 67%, 55% and 29% respectively with hydraulic loading of 140 mm · d^-1. The purification effect was strengthened with the gradual development of the vegetation. This study demonstrated that a wetland with reasonable winter aquatic plants and species composition can ultimately improve the purification effectiveness of wetlands in north China. Heat in urban drainage can provide favorable conditions for growth of winter vegetation in a cascaded wetland, so it is feasible to increase appropriate water depth to build submerged vegetation with Potamogeton crispus and Elodea canadensis.