Abstract: Soil samples were collected from a long-term fertilized vegetable field to study the effects of different fertilization treatments on the ecological characteristics of soil microbes. Comparing with applying inorganic fertilizers alone, a combined application of organic manure and inorganic fertilizers increased the amounts of soil bacteria and actinomycetes significantly, and enhanced the fungal diversity. The amount of soil bacteria and the diversity and evenness of soil fungi were significantly higher in treatment organic manure plus low level nitrogen than in other treatments. Applying high level nitrogen alone decreased the amount of bacteria significantly, and the diversity and evenness of soil fungi were obviously lower than the control.

Key words: Red soil, Enzyme activity, Correlation analysis, Cluster analysis