Figure 1.
Effect of different levels of Cu-contaminated soil mixed with natural soil on net photosynthesis (a), stomatal conductance (b), transpiration rate (c) and intercellular CO2 in the leaves of C. capsularis. Values in the figures are just one harvest. Bars sharing different lowercase letters denote significant statistical differences among the treatments at p < 0.05 according to least significant difference (LSD) test. Data shown are the average of three replications (n = 3). Ck (soil without addition of Cu-contaminated soil), T1 (Cu-contaminated soil is mixed with natural soil by 1:4), T2 (Cu-contaminated soil is mixed with natural soil by 1:2), T3 (Cu-contaminated soil is mixed with natural soil by 1:1) and T4 (Cu-contaminated soil is mixed with natural soil by 1:0).