Abstract: Investigations were carried out of quantities and compositions of soil PSM（phosphore solubilizing microorganism） and their relations with some soil chemical properties in three different ecological zones i.e.salt-affected area,heavy-metal-polluted area and phosphorus mining area.It was found that soil PSM varied in distribution from zone to zone.Population and species abundance of soil PSM was much higher in the phosphorus mining area than in the other two areas,but no big difference was observed between the areas in population of dominant species.In the heavy-metal-polluted area,soil phosphore solubilizing bacteria（PSB） accounted for a high proportion of the PSM,but was rather simple in community structure and dominated mainly with Bacillus megaterim.A significant positive relationship was found between the high proportion and the integrated heavy metals pollution index of the soil and between the abundance of PSB and soil organic matter content as well.In the salt-affected area,soil PSB was low in proportion and dominated with B.megaterium,Pseudomonas sp.and Flavobacterium sp.Their population was closely related to the content of soil organic matter and their community abundance to soil available P.

Key words: phosphate-solubilizing microbe, ecological types of soils, distribution, salt-affected area, heavy-metal-polluted area, phosphorus mining area