Impacted areas by iron mining may face challenges in the management of phosphate fertilization and reduced efficiency of rehabilitation practices, thus extending the time required for the rehabilitation of these areas. The objective of this study was to evaluate phosphorus (P) lability in soils of native forest and ferriferous canga areas (savanna vegetation above ironstone outcrops covering iron ore deposits) and in iron mine waste piles undergoing rehabilitation. Benches of the analysed waste pile differ in age of rehabilitation: as the initial rehabilitation stage (INI), we consider benches with fewer than 3 years of rehabilitation; the intermediate stage (INT) were benches with up to 5 years of rehabilitation; and the advanced rehabilitation stage (ADV) corresponds to benches with more than 8 years of rehabilitation activities. Organic and inorganic P fractions were analysed in these areas by chemical fractionation and were classified according to the degree of soil lability. The results show that in the canga environment, there was a predominance of inorganic fractions of moderate lability and moderate stability, with a strong dependency of the soil organic matter (SOM) on the P fractions, whereas there was a greater participation of the moderately labile organic fractions in the forest than in the canga. On the other hand, in the rehabilitation areas, there was an increase in the labile organic and inorganic fractions as the rehabilitation process advanced. The distribution of P in areas undergoing rehabilitation indicates that there is a tendency for P levels to resemble those of native environments, such as the forests.

中文翻译：

---

随着亚马逊河东部铁矿土地的恢复，磷的稳定性增加。

受铁矿开采影响的地区可能面临磷酸盐施肥管理和恢复实践效率下降的挑战，从而延长了这些地区恢复所需的时间。这项研究的目的是评估原生森林和含铁高加索地区（铁矿露头上方覆盖铁矿石矿床的热带稀树草原植被）和正在进行修复的铁矿废料堆中土壤的磷（P）不稳定性。经过分析的废料堆的长椅的恢复时间不同：作为初始恢复阶段（INI），我们考虑长于3年的长椅；中间阶段（INT）是可修复长达5年的长凳；而高级康复阶段（ADV）对应于具有8年以上康复活动的工作台。通过化学分馏对这些区域的有机和无机P组分进行分析，并根据土壤不稳定性的程度对其进行分类。结果表明，在高加环境中，主要存在中等程度的不稳定性和中等稳定性的无机级分，而土壤有机质（SOM）对P级分的依赖性强，而中等不稳定级的参与度更大。森林中的有机物含量高于甘蔗中的有机物含量。另一方面，在修复区，随着修复过程的进展，不稳定的有机和无机组分增加。磷在进行恢复的地区的分布情况表明，磷的含量与森林等自然环境相似。