Enhancing remediation potential of heavy metal contaminated soils through synergistic application of microbial inoculants and legumes

作者：Kang Zheng, Zexun Liu, Chao Liu, Jiayi Liu, Jiayao Zhuang · 发表于：Frontiers in Microbiology · 年份：2023 · DOI：10.3389/fmicb.2023.1272591 · 被引用次数：32 · 研究领域：Heavy metals in environment、Chromium effects and bioremediation、Microbial Community Ecology and Physiology

Soil microorganisms play a crucial role in remediating contaminated soils in modern ecosystems. However, the potential of combining microorganisms with legumes to enhance the remediation of heavy metal-contaminated soils remains unexplored. To investigate this, we isolated and purified a highly efficient cadmium and lead-tolerant strain. Through soil-cultivated pot experiments with two leguminous plants ( Robinia pseudoacacia L. and Sophora xanthantha ), we studied the effects of applying this microbial agent on plant nutrient uptake of soil nutrients, heavy metal accumulation, and the dynamics of heavy metal content. Additionally, we examined the response characteristics of inter-root microbial and bacterial communities. The results demonstrated that microorganisms screened from heavy metal-contaminated soil environments exhibited strong survival and adaptability in heavy metal solutions. The use of the Serratia marcescens WZ14 strain-phytoremediation significantly increased the soil’s ammonium nitrogen (AN) and organic carbon (OC) contents compared to monoculture. In addition, the lead (Pb) and cadmium (Cd) contents of the soil significantly decreased after combined remediation than those of the soil before potting. However, the remediation effects on Pb- and Cd-contaminated soils differed between the two legumes following the Serratia marcescens WZ14 inoculation. The combined restoration altered the composition of the plant inter-rhizosphere bacterial community, with the i...