FIGURE 4.

Heatmap based on the Spearman correlation matrix of the 17 variables (plant physiological and biochemical parameters) in different Pb‐treated ornamental plants. AB, above biomass of plant; Chl a + b, chlorophyll a + chlorophyll b; Chl a/b, chlorophyll a/chlorophyll b; Chla, chlorophyll a; Chlb, chlorophyll b; GB, gross biomass of plant; LA, leaf area; LN, leaf number per plant; MTI, membrane thermostability index; PH, plant height; P _n, net photosynthetic rate; Pro, proline; R/S, root biomass/aboveground biomass; RA, root activity; RB, root biomass of plant; SS, soluble sugar; TN, tiller number per plant