Physiological Response of Two Typical Plant Species under Combined Pb and Cd Stress in Bioretention Facilities

Bioretention facilities reduce stormwater runoff and pollutants, but there is a concern that plants in bioretention may absorb heavy metal pollutants from runoff, which might impair the growth of plant species. To investigate this issue, containing various amounts Pb Cd metals was used as irrigation water facility. The low concentrations were 0.08 0.04 mg/L, high values 0.68 0.32 mg/L. content physiological indicators measured. chlorophyll (CC), net photosynthetic rate (NPR), transpiration (TR). results showed changes (CC) highly correlated with plants’ Pb. Low slightly inhibited Ginkgo biloba L. Ligustrum × vicaryi NPRs, effect more obvious at vicaryi’s NPR decreased initial 8.97 μmol CO2/(m2s) to 5.77 under concentration conditions. increased TRs, significant. Under stress, L.’s TRs reached 0.63 mmol H2O/(m2s), 1.30 H2O/(m2s). two experimental groups remained throughout experiment, no significant inhibition. study found did affect function species some extent. Different behaved differently facilities, not lead death Our provide better understanding development typical facilities.