Despite the importance of phosphorus (P) as a macronutrient, the factors controlling the pool sizes of organic and inorganic P (OP and IP) in soils are not yet well understood. Therefore, the aim of this study was to gain insights into the pools sizes of OP, IP and organic carbon (OC) in soils and soil particle size fractions. For this purpose, I analyzed the distribution of OP, IP, and OC among particle size fractions depending on geographical location, climate, soil depth, and land use, based on published data. The clay size fraction contained on average 8.8 times more OP than the sand size fraction and 3.9 and 3.2 times more IP and OC, respectively. The OP concentrations of the silt and clay size fraction were both negatively correlated with mean annual temperature (R 2 = 0.30 and 0.31, respectively, p < 0.001). The OC:OP ratios of the silt and clay size fraction were negatively correlated with latitude (R 2 = 0.49 and 0.34, respectively, p < 0.001). Yet, the OC:OP ratio of the clay size fraction changed less markedly with latitude than the OC:OP ratio of the silt and the sand size fraction. The OC concentrations of all three particle size fractions were significantly (p < 0.05) lower in soils converted to cropland than in adjacent soils under natural vegetation. In contrast, the OP concentration was only significantly (p < 0.05) decreased in the sand size fraction but not in the other two particle size fractions due to land-use change. Thus, the findings suggest that OP is more persistent in soil than OC, which is most likely due to strong sorptive stabilization of OP compounds to mineral surfaces.

中文翻译：

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土壤粒度级分中的磷和碳：综合

尽管磷 (P) 作为常量营养素很重要，但控制土壤中有机和无机 P（OP 和 IP）池大小的因素尚不清楚。因此，本研究的目的是深入了解土壤中 OP、IP 和有机碳 (OC) 的池大小和土壤粒度分数。为此，我根据已发布的数据，分析了 OP、IP 和 OC 在不同地理位置、气候、土壤深度和土地利用的粒度级分中的分布。粘土粒度部分所含的 OP 比砂子粒度部分平均多 8.8 倍，IP 和 OC 分别多 3.9 和 3.2 倍。淤泥和粘土粒度部分的 OP 浓度均与年平均温度呈负相关（R 2 分别为 0.30 和 0.31，p < 0.001）。该o.c：粉砂和粘土尺寸部分的 OP 比率与纬度呈负相关（R 2 分别为 0.49 和 0.34，p < 0.001）。然而，粘土粒度部分的 OC:OP 比率随纬度的变化不如粉土和沙子粒度部分的 OC:OP 比率显着。在转化为农田的土壤中，所有三种颗粒大小部分的 OC 浓度都显着低于（p < 0.05），而在自然植被下的相邻土壤中。相比之下，由于土地利用的变化，OP 浓度仅在沙子粒度部分中显着降低（p < 0.05），而在其他两个粒度部分中则没有。因此，研究结果表明 OP 在土壤中比 OC 更持久，这很可能是由于 OP 化合物对矿物表面的强吸附稳定性。