Effect of phosphatase activity on soil organic phosphorus loss in the environment of clover growth Effects of different P sources on phosphatase activity of mycorrhizosphere of red clover inoculated with AMF Microbial communities in Pinus tabulaeformis mycorrhizosphere under different ecological conditions Diversity of Culturable Bacteria Associated with Tuber panzhihuanensePinus armandii Ectomycorrhizosphere Soil Diversity of Culturable Bacteria Associated with Tuber panzhihuanensePinus armandii Ectomycorrhizosphere Soil