Table 1 Chemical properties of soil and contents of Cd and Pb at 0–20, 20–40 and 40–60 cm depths
Chemical property | Soil depth | ||
|---|---|---|---|
0–20 cm | 20–40 cm | 40–60 cm | |
pH | 6.3 ± 0.9 | 6.6 ± 0.9 | 6.6 ± 0.9 |
Organic matter (g/kg) | 28.9 ± 9.5 | 18.3 ± 7.3 | 15.3 ± 10.2 |
CEC (c mol/kg) | 10.3 ± 3.3 | 9.9 ± 2.5 | 10.2 ± 3.5 |
Free iron oxide (mg/kg) | 62.5 ± 25.2 | 53.6 ± 14.0 | 55.5 ± 16.3 |
Phosphorus (g/kg) | 1.8 ± 0.5 | 1.6 ± 0.5 | 1.7 ± 0.5 |
Total Cd (mg/kg) | 2.7 ± 1.1 | 2.3 ± 1.7 | 2.0 ± 1.1 |
Available Cd (mg/kg) | 0.9 ± 0.6 | 0.7 ± 0.8 | 0.5 ± 0.2 |
Total Pb (mg/kg) | 366.1 ± 388.5 | 401.1 ± 695.3 | 366.2 ± 523.0 |
Available Pb (mg/kg) | 90.6 ± 78.6 | 85.3 ± 72.6 | 55.2 ± 61.2 |