南京市内秦淮河水葫芦生态修复潜力分析

对内秦淮河水质污染及水葫芦的生态修复情况。结果表明,内秦淮河总体为Ⅴ水质,以BOD、总磷、总氮污染为主,而且总磷、总氮严重超标,水体富营养化的趋势严重;在内秦淮河上游和排污口的适当地方用网隔引种水葫芦覆盖面积占水域总面积的30%,每年最低可净去除所在水体中氮11.2 t、磷1.8 t、有机质497 t、COD 396 t。另外,水葫芦还可吸收水体中金属离子、过滤水体浮游颗粒物等,总体上,水葫芦改善水质效果明显,如此连续种植数年,完全可以改善内秦淮河水体。建议在内秦淮河水体治理时,可采用生物-生态修复相结合的技术,实现内秦淮河有效的自治能力。

Potential Analysis of Restoring the Ecology of Eichhornnia crassipe in Internal Qinhuai River in Nanjing

The water pollution and the ecological restoration of Eichhornnia crassipe in Internal Qinhuai River were analyzed.The results showed that the main pollution indicators were BOD,total phosphorus and total nitrogen,and the water quality of Internal Qinhuai River belonged to Grade Ⅴ.By introducing the water hyacinth(accounting to the total water area 30%) at upper reaches and pollutant-emission outlets of Qinhuai River,the average neap quantity in year of N in water would be decreased by 11.2 t,P 1.8 t,organic matter 497 t,BOD 396 t.Also,the water hyacinth can absorb the metal ions,remove the water particle,and then improve the water quality.In order to control the water pollution in Internal Qinhuai River,it was the best way to restore the ability of water self-clean and maintain the balance of the water environment by using water plants.