污水净化湿地模拟系统中细菌和藻类的生态分布研究

THE ECOLOGICAL DISTRIBUTIONS OF BACTERIA AND ALGAE IN THE STIMULATING WETLAND SYSTEM

以湿地土壤－微生物模拟系统为基础，研究了细菌和藻类在不同处理单元中的生态分布和种类变化。随着系统中微生物的净化作用，污水中污染物浓度下降，污染负荷降低，细菌和藻类的种类和数量也发生相应的变化。系统中，藻类种类由耐污种类向喜清种类过渡，显示了藻类是良好的水质评价和监测的指示生物。细菌总量降低，第４单元中的细菌总量比第１单元要低２个数量级。Ｍａｒｇａｌｅｆ多样性指数逐渐升高，第１单元为０．３８，第２单元为０．６０，第３单元为０．６９，第４单元为０．８７。系统中的反硝化率在第２单元处最高，在第４单元处最低，垂直分布以２ｃｍ深度处最高。

With a stimulated wetland system,the ecological distributions and species changes of bacteria and algae in the different treatment blocks were studied.The species and numbers of bacteria and algae changed according to the concentration decline of pollutants.In the different treatment blocks,the bacteria species of the biofilms and algae changed from pollution tolerant ones to more diverse species.It was found that that algae were good biological indicators of water quality.The Margalef diversity index increased gradually along the treatment system.It was 0 38 in the 1st block,0 60 in the 2nd,0 69 in the 3rd and 0 87 in the 4th.The denitrification rate in the 2nd block was the highest among the four blocks and it was the highest in the depth of 2cm along the soil profile,while the rate was the lowest in the 4th block.