TABLE 1.
Basic physicochemical properties of the barren soil and rhizosphere soils under conditions of phytoremediation treatmentsa
| Propertyb | Soil | Treatment |
|||
|---|---|---|---|---|---|
| Barren land |
GHL | LCM | TCL | ||
| pH | Distal rhizosphere | 8.45 ± 0.13b | 8.62 ± 0.26b | 8.09 ± 0.42b | 9.29 ± 0.20a |
| Proximal rhizosphere | 8.89 ± 0.15a | 8.28 ± 0.01b | 8.88 ± 0.11a | ||
| EC (μs cm-1) | Distal rhizosphere | 8,260 ± 2,101a | 548 ± 141b | 914 ± 198b | 440 ± 141b |
| Proximal rhizosphere | 244 ± 72a | 193 ± 63a | 289 ± 44a | ||
| SOC (%) | Distal rhizosphere | 0.55 ± 0.08b | 0.56 ± 0.06b | 1.28 ± 0.38a | 0.87 ± 0.21ab |
| Proximal rhizosphere | 0.54 ± 0.04b | 1.08 ± 0.10a | 0.92 ± 0.10a | ||
| NH4+-N (mg kg-1) | Distal rhizosphere | 0.32 ± 0.08b | 0.10 ± 0.02b | 7.52 ± 2.23a | 2.34 ± 1.79b |
| Proximal rhizosphere | 0.20 ± 0.06b | 4.04 ± 0.32a | 3.84 ± 0.10a | ||
| NO3−-N (mg kg-1) | Distal rhizosphere | 2.70 ± 1.22c | 21.61 ± 5.20a | 14.50 ± 1.18ab | 9.99 ± 3.17b |
| Proximal rhizosphere | 2.44 ± 1.53a | 8.13 ± 0.60b | 3.40 ± 0.59a | ||
| AK (mg kg-1) | Distal rhizosphere | 126 ± 9b | 129 ± 28b | 273 ± 27a | 241 ± 49a |
| Proximal rhizosphere | 174 ± 27b | 316 ± 40a | 392 ± 30a | ||
| AP (mg kg-1) | Distal rhizosphere | 3.1 ± 0.7b | 20.3 ± 6.3b | 158.4 ± 53.5a | 3.7 ± 1.5b |
| Proximal rhizosphere | 17.3 ± 9.9a | 8.2 ± 1.7a | 2.6 ± 0.2a | ||
| TC (%) | Distal rhizosphere | 1.43 ± 0.13b | 1.88 ± 0.04ab | 3.57 ± 1.60a | 1.89 ± 0.07ab |
| Proximal rhizosphere | 1.80 ± 0.02b | 2.31 ± 0.07a | 1.92 ± 0.16b | ||
| TN (%) | Distal rhizosphere | 0.07 ± 0.01b | 0.07 ± 0.01b | 0.28 ± 0.12a | 0.12 ± 0.02b |
| Proximal rhizosphere | 1.07 ± 0.63a | 0.16 ± 0 0.01b | 0.12 ± 0.01b | ||
| C:N | Distal rhizosphere | 19.2 ± 0.38b | 28.2 ± 3.0a | 12.3 ± 0.3c | 16.1 ± 2.1bc |
| Proximal rhizosphere | 2.9 ± 2.2b | 14.2 ± 1.0a | 16.4 ± 0.4a | ||
a
Values represent means ± standard deviations (SDs) (n = 3). Values within a row followed by different lowercase letters are significantly different (P < 0.05, Duncan’s test).
b
EC, electrical conductivity; NH4+-N, ammonia nitrogen; NO3−-N, nitrate nitrogen; AK, available potassium; AP, available phosphorus; TC, total carbon; TN, total nitrogen; SOC, soil organic carbon.