Soils with continuous application of swine slurry (SS) may present high phosphorus (P) content and high risk for environmental pollution. The aim of this study was to characterize the forms of phosphorus accumulation in 15 fields with increasing degrees of P saturation (DPS) in a watershed with a high density of swine farming. Soil samples collected from 0 to 10 cm were chemically characterized for water soluble phosphorus (WSP), DPS, Hedley chemical fractionation, and chemical speciation by P K-edge XANES. WSP increased linearly to a value of 137% of DPS, with subsequent stabilization at 2.7 mg kg⁻¹. Only the inorganic fractions of the chemical fractionation changed with increasing DPS. Phosphorus forms considered labile increased up to 144% of DPS, with subsequent stabilization. The moderately labile fraction 0.1 M NaOH and non-labile 1 M HCl increased exponentially. Phosphorus K-edge XANES analysis demonstrated that P associated to apatite, amorphous aluminum minerals, and goethite were the main forms of P found and only the latter had a correlation with DPS (−0.57*). With increasing DPS, there are changes in the dynamics of P in the soil, with a reduction in forms associated to Fe and an increase in forms linked to Al. The forms linked to Al buffer the WSP and are recovered in the first inorganic fractions of the Hedley chemical fractionation.

连续施用猪粪（SS）的土壤中磷（P）含量高，对环境造成污染的风险也很高。这项研究的目的是表征在高密度养猪场的15个田地中磷的饱和度，随着P饱和度（DPS）的增加而增加。通过P K-edge XANES对从0到10 cm收集的土壤样品的水溶性磷（WSP），DPS，Hedley化学分馏和化学形态进行化学表征。WSP线性增加至DPS的137％，随后稳定在2.7 mg kg ^{− 1}。随着DPS的增加，只有化学级分的无机级分发生了变化。被认为不稳定的磷形式最多可增加144％的DPS，并具有随后的稳定性。适度不稳定的馏分0.1 M NaOH和非不稳定的1 M HCl呈指数增加。磷K边缘XANES分析表明，磷与磷灰石，无定形铝矿物和针铁矿有关，是发现的P的主要形式，只有后者与DPS相关（-0.57 *）。随着DPS的增加，土壤中P的动态变化，与Fe相关的形态减少，与Al相关的形态增加。与Al相连的形式缓冲WSP，并在Hedley化学分馏的第一批无机馏分中回收。