Table 3.
Soil and plant trace element (TE) concentrations; Ca(NO3)2-extractable (extr) essential (Zn, Cu, Fe) and non-essential (Cd, Pb) TE concentrations [mg (kg dry weight)−1] measured in bulk soil and total essential and non-essential TE concentrations [mg (kg dry weight)−1] in bulk soil and B. napus plants (root, stem, leaf and seed) from the control field (CO-F) and the contaminated field (TE-F)
| Bulk soil (extr) | Bulk soil (total) | Root | Stem | Leaf | Seed | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | Error | Mean | Error | Mean | Error | Mean | Error | Mean | Error | Mean | Error | |
| CO-F | ||||||||||||
| Cd | 0.15 | 0.0073 | 0.50 | 0.00 | 0.29 | 0.054 | 0.22 | 0.021 | 0.40 | 0.012 | nd | nd |
| Zn | 4.6 | 0.023 | 89 | 4.6 | 33 | 7.4 | 22 | 3.6 | 77 | 4.0 | 39 | 0.89 |
| Pb | nd | nd | 25 | 0.85 | nd | nd | nd | nd | nd | nd | nd | nd |
| Cu | 0.20 | 0.0073 | 15 | 0.41 | 3.7 | 1.1 | nd | nd | nd | nd | 9.5 | 4.8 |
| Fe | 1.8 | 0.98 | 9141 | 223 | 354* | 97 | 27 | 3.7 | 88 | 10 | 47 | 1.4 |
| TE-F | ||||||||||||
| Cd | 1.0**** | 0.0033 | 5.1**** | 0.088 | 3.1*** | 0.32 | 4.6*** | 0.31 | 7.2** | 0.45 | 0.88 | 0.081 |
| Zn | 78**** | 0.48 | 277**** | 6.7 | 490*** | 35 | 472**** | 27 | 863*** | 70 | 96**** | 1.5 |
| Pb | 0.38 | 0.010 | 199**** | 2.7 | 8.5 | 0.63 | nd | nd | 3.4 | 0.20 | nd | nd |
| Cu | 0.18 | 0.0050 | 27**** | 0.23 | 3.2 | 0.074 | nd | nd | 3.6 | 0.22 | 4.8 | 0.27 |
| Fe | 0.58 | 0.035 | 2209**** | 64 | 43 | 2.6 | 18 | 0.28 | 89 | 6.3 | 76**** | 3.2 |
Values are mean ± standard error of three biological independent replicates. Trace element concentrations in soil and plant compartments were compared between fields (significance levels:
P < 0.05;
P < 0.01;
P < 0.001;
P < 0.0001). Trace element contents which were too high or too low to be detected are indicated by ‘saturated’ (sat) and ‘not detected’ (nd) respectively.