Effects of Cadmium-tolerant Plant Growth-promoting Bacteria on Microbial Quantity and Enzyme Activity of Cadmium Contaminated Soil in Dongting Lake
The objective of the experiment was to determine the effects of plant growth-promoting bacteria on the microbial population and enzyme activities in cadmium contaminated soil.Strains T7 and J2 were added to cadmium contaminated soil of Dongting Lake.And different indicators were measured by cultivating method.The results showed that the culturable bacteria,actinomycetes counts increased distinctly,and the culturable fungi counts declined obviously under strain J2 condition,and actinomycetes increased insignificantly by strain T7.In addition,the bacterial/fungi and actinomycetes/fungi ratios increased obviously.The amounts of ammoniating bacteria,nitrifying bacteria,denitrifying bacteria and aerobic nitrogen-fixing bacteria increased evidently by strain J2,while the quantities of ammoniating bacteria and denitrifying bacteria changed insignificantly by strain T7.Strain J2 promoted remarkably the activities of urease,catalase and phosphatase,and strain T7 promoted evidently the activities of urease and catalase.Correlation analysis showed that there were significant or highly significant correlation between different microbial groups,or enzymes activities,or microbial quantities and enzyme activities.It demonstrated that plant growth-promoting bacteria T7 and J2 improved remarkably microbial environment of cadmium contaminated soil.
NETL
NSTL
万方数据
维普
