The abundance of phosphate solubilizing bacteria, together with the alkaline phosphatase (ALPase) activity in the sediment samples of Lake Taihu in different seasons, sites and depths, was analyzed. And the relationship between the distribution of phosphate solubilizing bacteria and the ALPase activity was discussed. Results show that phosphate solubilizing bacteria is universally detected in surface sediments. With the increasing depth, the amount of phosphate solubilizing bacteria decreases. The number of phosphate solubilizing bacteria strains reaches the maximum in autumn while the minimum in winter. ALPase activity ranges from 0.001 mmol (g x min)(-1) to 0.006 mmol (g x min)(-1) and it varies with different sites and seasons and declines with the increasing depth. ALPase activity varies widely above 12cm, and stabilizes about 0.001 mmol x (g x min)(-1) under 12 cm in each site. There is a correlation between ALPase activity and the number of phosphate solubilizing bacteria and the correlation coefficients range from 0.50 to 0.85.
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