Abstract: By using solid culture media containing organic and inorganic phosphorus, six strains of phosphorous bacteria in West Lake sediment were isolated and purified,among which, two strains coded as OP₁ and OP₂ could decompose lecithin, and the other four coded as NOP₁, NOP₂, NOP₃ and NOP₄ could dissolve inorganic phosphate. OP₁, OP₂ and NOP₃ had a stronger phosphate-solubilizing capability, followed by NOP₄, while NOP₁ and NOP₂ lost this capability after isolation and purification. The water-soluble P concentration in the culture media inoculated with OP₁,OP₂ and NOP₃ increased 38.53, 64.53 and 54.06 fold, respectively, compared with the control.

Key words: Phragmites communis, Clone plant, Ramet, Biomass allocation, Heterogeneous speed growth