ALPase Activity and the Distribution of Phosphate Solubilizing Bacteria and the Relationship Between Them in Sediments of Lake Taihu
太湖沉积物中解磷细菌分布及其与碱性磷酸酶活性的关系

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 0.001mmol?(g?min)-1 to 0.006mmol?(g?min)-1 and it varies with different sites and seasons and declines with the increasing depth. ALPase activity varies widely above 12cm, and stabilizes round about 0.001mmol?(g?min)-1 under 12cm 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.