From tailings to soil: long-term effects of amendments on progress and trajectory of soil formation and in situ remediation in bauxite residue

摘要

Bauxite residue is an alkaline, saline-sodic byproduct of the Bayer process for alumina production. In situ remediation of bauxite residue is a cost-effective management strategy that transforms the residue into a soil-like medium; however, the effects of applied amendments on trajectories and progress of soil formation over the medium-long term are unclear. Here, we investigated how in situ remediation amendments guided the progress and trajectories of soil formation in bauxite residue over 20 years.