Molecular Soil Biology 2026, Vol.17, No.1, 26-37 http://bioscipublisher.com/index.php/msb 28 Figure 1 Network analysis of microbial communities and soil physicochemical properties under different fertilization treatments (Adopted from Shu et al., 2025) 3 Community Diversity Analysis of Phosphate-solubilizing Bacteria 3.1 Classification and functional groups of phosphate-solubilizing bacteria Phosphate-solubilizing bacteria are not a single phylogenetic unit but a diverse collection of microorganisms with the functional phenotype of "promoting phosphorus release/mineralization" (Li et al., 2024). They are commonly found in several groups such as the Proteobacteria and Firmicutes, and may also include fungal groups (Pan et al., 2023). Roughly classified by functional processes, they can be summarized into three categories: the first is the inorganic phosphorus dissolution type, which achieves mineral phosphorus dissolution by secreting organic acids to lower pH and complexing metals such as Ca/Fe/Al; the second is the organic phosphorus mineralization type, which secretes alkaline/acidic phosphatases or phytases to hydrolyze organic phosphorus; the third is the
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