It revealed that the occurrence of HMs had prohibitive effects on
the growth of T. patula (Fig. 1b). The shoot dry weight was inhibited
and reduced by the rate of 18.0–35.0% in B[a]P–Cd treatments,
19.4–26.1% in B[a]P–Pb treatments, and 19.2–55.3% in B[a]P–Cu
treatments relative to the single treatment of 5mg B[a]P kg−1 (T1),
respectively. Although shoot biomass tended to decrease under
joint stress of HMs and B[a]P, the effect was not statistically significant
compared with the initial concentration at 5mg kg−1 B[a]P
(except T7) (P > 0.05). It was also observed that the high levels of
metal addition (T3, T5 and T7) impacted plant growth compared
with low concentrations of HMs (T2, T4 and T6), especially for the
treatments of B[a]P–Cu, shoot biomass at B[a]P5Cu500 decreased
significantly (P < 0.05) in comparison to B[a]P5Cu100
It revealed that the occurrence of HMs had prohibitive effects onthe growth of T. patula (Fig. 1b). The shoot dry weight was inhibitedand reduced by the rate of 18.0–35.0% in B[a]P–Cd treatments,19.4–26.1% in B[a]P–Pb treatments, and 19.2–55.3% in B[a]P–Cutreatments relative to the single treatment of 5mg B[a]P kg−1 (T1),respectively. Although shoot biomass tended to decrease underjoint stress of HMs and B[a]P, the effect was not statistically significantcompared with the initial concentration at 5mg kg−1 B[a]P(except T7) (P > 0.05). It was also observed that the high levels ofmetal addition (T3, T5 and T7) impacted plant growth comparedwith low concentrations of HMs (T2, T4 and T6), especially for thetreatments of B[a]P–Cu, shoot biomass at B[a]P5Cu500 decreasedsignificantly (P < 0.05) in comparison to B[a]P5Cu100
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