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Effects of Pb treatment on chlorophyll a (a), chlorophyll b (b), chlorophyll a + b (c), and chlorophyll a/b (d) in leaves of Hemerocallis fulva, Iris germanica L., Canna generalis, Pennisetum clandestinum, and Miscanthus sinensis. Vertical bars represent ± SD of the mean (n = 3); different letters on the SD bars indicate significant differences among the Pd treatments (p < .05). Pb, Pb treatment; PS, plant species. **Significant differences at p < .01
