Influences of Bacillus on Metabolic Functions of Microbial Communities in Fishponds

Fishponds applied with and without Bacillus were taken as research objects to study the differences of metabolic functions of microbial communities(MFMC) of different spaces in the fishpond waters and surface sludge using Biolog plate.The results showed that Bacillus improve the average activities of microbial communities metabolism(AAMCM) in the waters,as well as the utilization of carbon sources such as amino acids,amines,carboxylic acids,polymers and other carbon sources.The diversity of microbial communities metabolism(MCM) of the waters was improved(the differences of Shannon evenness,Simpson index,and McIntosh evenness were significant);and the differences of AAMCM of surface sludge in the two ponds were fairly small,and the difference of utilization the same carbon source was insignificant.Bacillus significantly improved the Simpson index of surface sludge;however,the McIntosh index of surface sludge was significantly lower than the control ponds.In brief,fishponds applied with Bacillus the influence of its waters' MFMC was greater than surface sludge,Bacillus improved the microbial degradable capability in the waters against organic pollutants though the improvement of MCM activities in the waters to better the ecological environment in ponds.