包裹型根际促生菌剂强化龙葵修复镉污染农田土壤

制备了一种具有镉活化功能的包裹型根际促生菌剂，用于强化镉超累积植物龙葵对镉污染农田土壤的植物修复作用。结果表明：包裹型菌剂Z16的多腔室结构适合菌株的生存，菌剂Z16的释菌浓度在24 h孵育后达到10⁶ CFU·g⁻¹；与菌液组EC相比，菌剂Z16组的龙葵地上部鲜重提高了19.81%，地上部和根部镉的富集系数分别提高了20.98%和168.97%，根际土壤碳酸盐结合态镉的浓度得到活化，龙葵对钙、锰和铁元素的吸收能力也得到增强。因此，与施用菌液EC相比，包裹型根际促生菌剂Z16通过在根际土壤持续释放菌株，可提高难溶性镉的活化效果及提高植物修复效率。本研究可为强化超累积植物-根际促生菌联用技术对镉污染农田的植物修复效率提供参考。

Enhanced remediation of cadmium contaminated farmland soil by Solanum nigrum L . with coated rhizosphere growth-promoting agent

A type of encapsulated plant growth promoting rhizobacterial inoculant with the capacity of insoluble cadmium (Cd) mobilization was developed to improve the Cd-phytoremediation efficacy of Cd-hyperaccumulator Solanum nigrum L. in Cd-contaminated farmland soil. According to the present research, encapsulated inoculant Z16 with the multi-chambered structure avail for PGPR survival. The number of bacteria released was 106 CFU·g−1 after 24 hours. When compared with EC inoculation, specifically, the fresh weight in shoots, Cd bioconcentration factor of the shoots and roots were increased by 19.81%, 20.98% and 168.97%, respectively. Insoluble Cd mobilization in rhizosphere soil and calcium, manganese, and iron absorption of Solanum nigrum L. was improved. Therefore, continuous bacteria released in rhizosphere soil by encapsulated plant growth promoting rhizobacterial inoculant makes insoluble Cd mobilization and Cd-phytoremediation more efficient, which has a great application prospect.