Figure 7 | Scientific Reports

Figure 7

From: Extraction of heavy metals from copper tailings by ryegrass (Lolium perenne L.) with the assistance of degradable chelating agents

Figure 7

Principal component analysis (PCA) of physiological, biochemical parameters under the application of CA、FA and PASP (a). Heat map generated from Pearson’s correlation coefficients of different indices (b). EC, electrical conductivity; SOC, soil organic matter; CEC, cation exchange capacity; Eh, redox potential; root Cu, Stem Cu, root Cd, stem Cd represent the concentrations of Cu and Cd in ryegrass root and stem, respectively. Values are means ± SD (n = 3). Different letters indicate significant differences at p ≤ 0.05 according to the Tukey’s HSD test; values are in the order a > b > c.

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