Table 1.
Soil characteristics of Pb-Zn-tailings-contaminated karst soil in Sidi Village.
| Land-use type | CK | Corn field | Citrus field | Paddy field |
|---|---|---|---|---|
| Total-Pb | 28.02 ± 8.38B∗ | 1262.5 ± 188.80A | 719.41 ± 185.64 A | 1388.42 ± 213.24 A |
| Total-Zn | 137.85 ± 16.31 B | 1523.22 ± 129.69 A | 1291.11 ± 217.19 A | 1789.40 ± 190.05 A |
| Total-Cu | 24.58 ± 9.69 B | 196.93 ± 28.79 AB | 215.73 ± 50.54 A | 245.81 ± 27.80 A |
| Total-Cd | 29.37 ± 17.78 B | 59.12 ± 5.10 AB | 50.77 ± 12.06 AB | 81.37 ± 10.34 A |
| DTPA-Pb | 7.98 ± 0.69 B | 527.62 ± 66.89 A | 355.98 ± 24.46 A | 477.36 ± 44.11 A |
| DTPA-Zn | 9.38 ± 0.23 B | 326.81 ± 22.38 AB | 280.09 ± 49.65 AB | 569.14 ± 22.59 A |
| DTPA-Cu | 0.31 ± 0.03 B | 30.55 ± 3.53 A | 21.14 ± 2.47 A | 35.48 ± 3.90 A |
| DTPA-Cd | 4.48 ± 0.13 C | 4.64 ± 0.04 BC | 4.83 ± 0.06 AB | 4.99 ± 0.04 A |
| TN | 0.60 ± 0.09 A | 1.17 ± 1.79 A | 0.60 ± 0.14 A | 0.78 ± 0.24 A |
| AN | 92.47 ± 7.00 B | 100.56 ± 6.44 AB | 92.81 ± 5.59 B | 121.87 ± 8.41 A |
| CEC | 8.50 ± 0.64 A | 8.20 ± 1.33 A | 7.81 ± 1.54 A | 10.03 ± 2.60 A |
| pH | 5.20 ± 0.88 B | 5.60 ± 0.51 AB | 5.18 ± 0.49 B | 5.91 ± 0.38 A |
| SOC | 23.01 ± 3.34 AB | 19.37 ± 2.17 BC | 14.08 ± 2.99 C | 26.84 ± 2.40 A |
| DOC | 165.35 ± 29.39 B | 209.97 ± 19.72 B | 145.78 ± 8.200 B | 223.19 ± 33.41 A |
| POC | 4.13 ± 1.18 B | 4.76 ± 0.38 AB | 4.73 ± 0.50 AB | 7.35 ± 0.82 A |
| MBC | 477.42 ± 41.34 A | 412.31 ± 11.00 AB | 268.37 ± 13.40 B | 249.36 ± 6.54 B |
| Bacteria | 9.28 × 1010 ± 1.36 × 1010 AB | 1.13 × 1011 ± 4.64 × 1010 A | 1.93 × 1010 ± 1.06 × 1010 B | 1.64 × 1011 ± 1.12 × 1010 A |
| Fungi | 8.95 × 107 ± 8.81 × 106 A | 4.34 × 107 ± 1.23 × 106 AB | 5.05 × 107 ± 6.29 × 106 AB | 2.44 × 107 ± 1.25 × 106 B |
∗Data are means ± standard deviations (13 paddy soil samples, 13 corn field soil samples, 14 citrus field soil samples, and 4 CK soil samples). Statistical pairwise multiple comparisons of homogenous data were carried out by the Tukey test: means with the same letter in the same line are not significantly different at P < 0.05. The unit for AN; DOC; POC; MBC; total Pb, Zn, Cu, and Cd; and available Pb, Zn, Cu, and Cd is mg kg−1. The unit for TN and SOC is g kg−1. The unit for CEC is cmol kg−1. The unit for bacteria and fungi is copies g−1 of dry soil. DTPA, DTPA-extractable.