Table 2.
Effects of simulated acid rain on soil physicochemical properties of Alternanthera philoxeroides and Alternanthera sessilis.
| Species | A. philoxeroides | A. sessilis | ||||
|---|---|---|---|---|---|---|
| Treatment | pH 2.5 | pH 4.5 | CK | pH 2.5 | pH 4.5 | CK |
| pH | 6.30 ± 0.02b | 6.79 ± 0.09a | 6.93 ± 0.06a | 6.05 ± 0.09b | 6.57 ± 0.12a | 6.82 ± 0.05a |
| EC μs/cm | 597.4 ± 66.2a | 261.4 ± 34.4b | 207.3 ± 14.7b | 602.4 ± 67.0a | 305.8 ± 23.9b | 289.4 ± 9.4b |
| OM g/kg | 647.9 ± 4.3b | 689.7 ± 12.0a | 701.3 ± 5.9a | 633.9 ± 12.0b | 710.6 ± 16.2a | 724.5 ± 5.9a |
| TN g/kg | 11.5 ± 0.05c | 12.1 ± 0.05a | 11.8 ± 0.07b | 11.7 ± 0.14b | 12.3 ± 0.18a | 11.9 ± 0.09ab |
| TP g/kg | 2.7 ± 0.06a | 2.9 ± 0.04a | 2.9 ± 0.13a | 2.4 ± 0.11b | 2.8 ± 0.19ab | 3.3 ± 0.11a |
| TK g/kg | 7.5 ± 0.5a | 7.8 ± 0.3a | 8.3 ± 0.3a | 8.1 ± 0.2b | 8.7 ± 0.1ab | 9.2 ± 0.2a |
| AN mg/kg | 28.0 ± 0.8b | 33.8 ± 1.8a | 31.3 ± 0.5ab | 23.4 ± 0.8c | 28.7 ± 0.6b | 31.7 ± 0.8a |
| AP mg/kg | 75.5 ± 1.4c | 102.0 ± 3.8a | 84.3 ± 2.6b | 77.0 ± 2.1b | 108.5 ± 1.3a | 101.0 ± 4.8a |
EC, electrical conductivity; OM, organic matter; TN, total nitrogen; TP, total phosphorus; TK, total potassium; AN, ammonium nitrogen; AP, available phosphorus. Data are the average values ± standard error. Different letters in the same row indicate significant differences among the different treatments (p < 0.05).