黄花鸢尾对富营养化水体净化的试验研究

利用黄花鸢尾(Irispseudoacorus)对含盐和氮磷较高的水体进行富营养化控制研究。结果表明,黄花鸢尾对于总氮、亚硝酸盐、硝酸盐等营养盐有较好的去除效果,水体中的硝酸盐变化趋势与溶解氧相同,氨氮变化趋势与溶解氧相反。黄花鸢尾可以有效地控制水中的叶绿素a,种植黄花鸢尾的水体中叶绿素a仅为对照的1/168,说明黄花鸢尾可以有效抑制藻类的繁殖生长。同时,种植黄花鸢尾能抑制水体pH值的提高,降低盐度,提高透明度,对改善水质有很好的效果。黄花鸢尾对营养盐的去除主要是通过植物根际微生物的作用。通过MPN(mostprobablenumber)法测定黄花鸢尾植物群落的分布可以看出,其根际的氮循环菌最为密集,由根际向外呈递减趋势。

Purification of Eutrophicated Water by Iris Pseudoacorus

Iris pseudoacorus were used to control pollution of eutrophicated water with high salinity in this study.Iris pseudoacorus were cultured in a phytoremdiation system inserted into a polyfoam plate that floated in upper tank filled with 60 L reclaimed water containing high salinity and nutriments.The contens of total nitrogen(TN),total phosphorus(TP),nitrate nitrogen,nitrous nitrogen,and ammonia nitrogen Chl-a were tested during growth of Iris pseudoacorus,compared with the tank without plants.In addition,determination of distribution and role of four nitrogen cycle bacteria employed the most probable number(MPN)method,including ammonifying bacteria,denitrifying bacteria,nitrosobacteria and nitrobacteria.The results showed that Iris pseudoacorus had a high ability to remove total nitrogen(TN),total phosphorus(TP)and nitrate nitrogen.The removal rates of TN and TP enhanced 60.3% and 107.9%,respectively,compared with the tank without plants.The removal rate of nitrate nitrogen was 94.6%.Nitrate nitrogen would have been add when DO had added,but ammonia nitrogen was reversed of DO's change.Iris pseudoacorus not only could effectively remove Chl-a,Chl-a in the water with Iris pseudoacorus was only 1/168 of the water no plants,but also could enhance transparence,keep pH and improve water quality.Most probable number(MPN)method was employed to determine the distribution of four nitrogen cycle bacteria,including ammonifying bacteria,denitrify bacteria,nitrosobacteria and nitrobacteria.The results showed the MPN values of nitrogen cycle bacteria were very dense in rhizosphere and decreased from rhizosphere to outside.