Root exudates could activate heavy metals in soil,and enhance their bio-availability by dissolving,chelating,deoxidizing,decrease migration of heavy metals by fixating and inacti-vating.

• 根系分泌物可通过溶解、螯合、还原等作用活化土壤重金属,提高重金属的植物有效性,或固定和钝化重金属,降低重金属的移动性。