Phytoremediation effect of Scirpus triqueter inoculated plant-growth-promoting bacteria (PGPB) on different fractions of pyrene and Ni in co-contaminated soils

Few reveal the mechanism of inoculation plants with PGPB to remediate PAH-metal co-contaminated soil by analyzing the chemical speciations of contaminants. This literature investigated the influence of inoculation plants with PGPB on different fractions of pyrene and Ni in rhizospheric and non-rhizospheric soil. FDA activities were studied to determine the activities of soil microorganisms. In addition, plant dry weight was studied to reflect the resistance of the inoculated plants to environmental stress. The addition of PGPB increased the tolerance of plants in Ni and Ni-pyrene contaminated soil, especially in single Ni-contaminated soil, but not increased the plant biomass in single pyrene-contaminated soil. Compared to single pyrene contaminated soil, the presence of Ni significantly promoted the degradation of pyrene in both rhizospheric and non-rhizospheric soil. On the contrary, the presence of pyrene hindered the inoculated plant from accumulating Ni to some extent.