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Concentrations of zinc (Zn) (A), lead (Pb) (B), mercury (Hg) (C), chromium (Cr) (D), cadmium (Cd) (E), arsenic (As) (F) in four sites. Different lowercase letters (a, b, c, d) indicate a significant difference under different sites based on ANOVA (p < 0.05). NG = native grassland, RPc = restoration by Picea crassifolia, REn = restoration by Elymus nutans, NV = non-vegetated.
