The dynamic characteristics of enzyme activities and bacteria species groups in the substrate of stream banks have been studied through the construction of a special riverine ecosystem

in which the ecological embankments are made up of prefab spherical bricks with porous concrete. The microbial biomass

three kinds of bio-enzymes and five types of bacteria species groups in the substrate of ecological embankments were scouted. Results showed that there are significantly distribution differences (p<0. 05) in the microbial biomass and bio-enzyme activities in the ecological embankments. The activities of dehydrogenase

urease and cellulase are significantly higher in June and September than those in March and December

and the activities of these bio-enzymes in aquatic plants district of the ecological embankments are also higher than those of other places. Microbial biomass appears a peak in June

and its spatial characteristic is similar with the enzyme activities

which all have an accumulated ecological effect on the hydrophyte rhizosphere. The performance indexes of microorganism in the water level fluctuation zone are all superior to those in other places. Aerobic bacteria (cellulose decomposing bacteria

ammonifying bacteria

nitrosation bacteria and nitrobacteria) and anaerobic bacteria (denitrifying bacteria) have the same distribution in the ecological embankments

the quantity of bacterium also appears a peak in June and September

and the dynamic characteristics of each type of bacteria in the special riverine ecosystem are consistent with the biomass and bio-enzyme activities.