Abstract: Rhizosphere and nonrhizosphere soils were sampled from corn field at harvest time.Total number and genus of the bacteria mineralizing lecithin or dissolving phosphate were measured.It was found that the number of either organic or inorganic phosphobacteria in the rhizosphere soil was 10 to 20 times higher than those in the nonrhizosphere soil.The community structure was much more complicated in the rhizosphere than in the nonrhizosphere.Pseudomonas and Flavobacteria were advantageous orgainc phosphobacteria in the rhizosphere, but Erwinia for inorganinc phosphobacteria.In nonrhizosphere, most of organic phosphobacteria were Bacillus. However, no advantageous genus of inorganic phosphobacteria were found in the nonrhizosphere soil.

Key words: Zoysia matrella, lawn, weed community, power law, spatial heterogeneity.