水生经济植物净化受污染水体研究

A Study on Polluted Water Body Purification with Economical Aquatic Plants

在富营养化水体中 ,利用人工基质无土栽培水生经济植物净化水质的静态试验结果表明 ,在 5月～ 10月间 ,水蕹菜对TN、TP的去除率分别为 81.32 %和 71.34% ;在 11月～ 3月间 ,水芹菜对TN、TP的去除率分别为 82 .77%和 94 .77%。经重金属检测分析 ,水蕹菜和水芹菜茎叶部分的Cu、Cd、Pb和Zn含量均处于可食用范围内。结合现场试验结果 ,轮种上述两种经济植物 ,每m2 水面每年可自水中移除TN2 0 4 .80 g、TP2 4 .6 2 g,并可收获蔬菜 50kg·m- 2 ,具有显著的环境效益和经济效益。

Purification of Liwahe creek which belonged to a eutrophic water body was studied by means of soilless cultivation techniques on artificial substratum from may, 1992 to March, 1998. In the static purification test, the removal rate of TN and TP with Ipomoea aquatica were 81.32% and 71.34% from May to October, respectively. With Oenanthe javanica , the above removal rate were 82.77% and 94.77% from November to March, respectively. The heavy metal content (Cu, Cd, Pb, Zn) data revealed that the soilless cultivated economical plants were eatable. The contribution degrees of plant uptake for N and P varied with economical plant iomass productivity and the pattern of vegatation and management in the field.