Effects of pot simulated heavy metal stress on growth and heavy metal accumulation of <i>Brassica chinensis L.</i> in greenhouse

The effect of heavy metal migration, accumulation, and growth of Brassica chinensis L. were studied by the pot experiment. The results had shown that cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn), and nickel (Ni) had inhibitory effects on the growth of Brassica chinensis L., but chromium (Cr) did not. The highest inhibitory degree was observed for Ni and Cu, relative growth rate was 0.21–0.35 and 0.32–0.42 g d−1, stress tolerance index was 22.44–31.77 and 29.88–36.55%, and leaf area and root length were the lowest. The main accumulation organs of Cd, Cu, and Zn are edible parts, and Pb, Cr, and Ni are in the roots. The bioconcentration factor of Cd (0.212–7.064) is the highest and that of Ni and Cr are the lowest. The accumulation of Cd and Pb, Cd and Zn, and Cd and Ni in Brassica chinensis L. showed mutual inhibition effects, and the accumulation of Pb and Cr in Brassica chinensis L. showed synergistic effects. In the production of leaf vegetables, attention should be given to the pollution of Cd in soil. Brassica chinensis L. has a high cumulative capacity for Cd, which has a certain application prospect in the implementation of green technology remediation of Cd-contaminated soil.