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. 2020 Jul 10;11:1574. doi: 10.3389/fmicb.2020.01574

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.