Synergistic mitigation of lead accumulation in celery by magnesium polypeptide and microbially induced calcite precipitation in phosphate mining wasteland soils

Phosphate mining wasteland soils are heavily contaminated with lead (Pb), severely inhibiting plant growth and compromising ecological safety. Pot experiments were conducted to evaluate the synergistic effects of microbially induced carbonate precipitation (MICP) and magnesium polypeptide (MP) amendments on celery growth and the restructuring of rhizosphere microbial communities. The combined MICP-MP treatment significantly reduced Pb accumulation in celery, with concentrations decreasing in roots, stems, and leaves, and promoted plant growth and development. This study provides new insights into plant-microbe interactions under heavy metal stress.