Table 2.
Soil chemical properties of copper tailings dam.
| Physical and chemical factors | Spring | Summer | Autumn | Winter |
|---|---|---|---|---|
| SWC | 10.52 ± 0.337b | 0.84 ± 0.036c | 86.16 ± 0.213a | 9.10 ± 1.675b |
| pH | 8.20 ± 0.028b | 8.20 ± 0.017b | 8.11 ± 0.029b | 8.89 ± 0.038a |
| NH4 +-N/mg·kg−1 | 0.40 ± 0.109 | 0.23 ± 0.086 | 0.43 ± 0.075 | 0.19 ± 0.105 |
| NO3 −-N/mg·kg−1 | 0.15 ± 0.064 | 0.07 ± 0.008 | 0.13 ± 0.007 | 0.11 ± 0.018 |
| NO2 −-N/mg·kg−1 | 0.01 ± 0.000b | 0.01 ± 0.000b | 0.01 ± 0.002a | 0.01 ± 0.001ab |
| TN/g·kg−1 | 0.04 ± 0.003b | 0.08 ± 0.005a | 0.05 ± 0.005b | 0.05 ± 0.006b |
| TC/g·kg−1 | 0.92 ± 0.033b | 6.10 ± 0.969a | 1.03 ± 0.041b | 1.04 ± 0.116b |
| C/N | 24.48 ± 2.024b | 81.02 ± 16.746a | 22.06 ± 1.474b | 21.37 ± 2.060b |
| TS/g·kg−1 | 0.06 ± 0.006 | 0.46 ± 0.295 | 0.14 ± 0.017 | 0.05 ± 0.002 |
| ST/°C | 16.83 ± 1.354b | 24.27 ± 0.318a | 26.87 ± 0.484a | 8.10 ± 1.002c |
| Salinity/mg·L−1 | 14.33 ± 3.712b | 0.00 ± 0.000c | 31.67 ± 1.202a | 4.00 ± 1.000c |
| EC/μs·cm−1 | 26.33 ± 6.766b | 0.00 ± 0.000c | 57.67 ± 1.667a | 7.33 ± 1.856c |
Values represent mean with standard error in parenthesis. Significant differences between sites (Duncan test, p < 0.05) are denoted with letters (a > b > c). SWC, soil water content; NH4 +-N, ammonium nitrogen; NO3 −-N, nitrate nitrogen; NO2 −-N, nitrite nitrogen; TN, total nitrogen; TC, total carbon; TS, total sulfur; C/N, the ratio of carbon and nitrogen; ST, soil temperature; EC, electrical conductivity.