Phosphorus (P) availability in calcareous forest soils is commonly low compared to siliceous soils. The main reason for this is that phosphate ions tend to precipitate with calcium (Ca). Weathering of calcareous rocks and the potential of microorganisms to dissolve calcareous parent material is not fully understood. Therefore, we examined microbial carbonate dissolution and the abundance of phosphorus-solubilizing bacteria in temperate forest soils with contrasting calcareous parent materials. We incubated soil extracts with weathered parent materials (i.e., dolomite and limestone) from two calcareous forest soils differing in P content and determined the rates of P and Ca solubilization. In addition, we determined the abundance of phosphorus-solubilizing bacteria (PSB). We found that the net Ca solubilization rate ranged from 8.8 to 511.1 nmol m⁻² d⁻¹ across both soils and depths. Calcium dissolution rates were negatively related to pH and positively related to the concentration of organic acids. The gross P solubilization rates were on average 63.6% higher from dolomite (P-poor soil) than from limestone (P-rich soil). The abundance of soil PSB ranged from 3.8 % at the limestone site (P-rich soil) to 24.4 % at the dolomite site (P-poor soil). The higher abundance of PSB in the soil derived from dolomite is in line with the high Ca and P solubilization rates at this site, indicating that PSB abundance is related to rock weathering rates from calcareous soils. Pseudomonadales and Enterobacteriales were by far the two most abundant bacterial orders in the PSB community of both soils and soil depths. In conclusion, this study shows, first, that weathering of calcareous bedrocks is strongly affected by the activity of soil microorganisms, and second, that there is likely a selective pressure in P-poor soils towards a higher abundance of PSB.

与硅质土壤相比，钙质森林土壤中磷 (P) 的可用性通常较低。其主要原因是磷酸根离子倾向于与钙 (Ca) 一起沉淀。钙质岩石的风化作用和微生物溶解钙质母体的潜力尚不完全清楚。因此，我们研究了温带森林土壤中微生物碳酸盐溶解和磷溶解细菌的丰度，以及对比钙质母体材料。我们将土壤提取物与来自两种磷含量不同的钙质森林土壤的风化母材（即白云石和石灰石）一起培养，并确定了磷和钙的溶解率。此外，我们还确定了溶磷细菌 (PSB) 的丰度。我们发现净 Ca 溶解速率范围从 8.8 到 511.1 nmol m⁻² d ⁻¹跨越土壤和深度。钙溶解速率与 pH 呈负相关，与有机酸浓度呈正相关。白云岩（贫磷土壤）的总磷溶解率平均比石灰石（富磷土壤）高 63.6%。土壤 PSB 的丰度范围从石灰岩场地（富磷土壤）的 3.8% 到白云岩场地（贫磷土壤）的 24.4%。来自白云石的土壤中 PSB 丰度较高与该地点的高钙和磷溶解率一致，表明 PSB 丰度与来自钙质土壤的岩石风化速率有关。Pseudomonadales 和 Enterobacteriales 是迄今为止土壤和土壤深度的 PSB 群落中最丰富的两种细菌目。总之，这项研究表明，首先，