Abstract: Investigations of soil enzyme activities and microbial community functional diversity were conducted in soil from the fields under a long-term fertilization experiment in the Ecological Experimental Station of Red Soil,Chinese Academy of Sciences.Results show that soil enzyme activities and microbial community functional diversity varied sharply between treatments under different fertilization pattern or rate.Soil urease and dehydrogense activities could be cited as a comprehensive index of soil fertility.After 20 years′ fertilizer application in the field under a double paddy-rice cropping system,activity and biomass of soil enzymes increased significantly,while microbial community diversity decreased as shown by BIOLOG~(TM) results.Microbial biomass and community functional diversity were higher in P treatments than in no-P ones.Microbial community uniformity was higher in straw-incorporation treatments than in no-straw ones.

Key words: red soil, paddy soil, fertilization, enzyme activity, microbial community, function diversity, BIOLOG~(TM)