Table 1.
Soil properties and CN content (mean ± standard error) in four sites.
| NG | REn | RPc | NV | |
|---|---|---|---|---|
| pH | 7.36 ± 0.10 a | 8.26 ± 0.03 a | 8.58 ± 0.02 a | 8.61 ± 0.06 a |
| EC (mS m−1) | 234.55 ± 10.20 a,b | 170.90 ± 4.63 b | 208.60 ± 9.31 a,b | 260.47 ± 26.43 a |
| SOM (g kg−1) | 94.46 ± 7.59 a | 32.97 ± 3.02 b | 16.85 ± 1.89 c | 18.99 ± 3.80 c |
| N (g kg−1) | 3.38 ± 0.21 a | 1.47 ± 0.12 b | 1.10 ± 0.06 b,c | 0.99 ± 0.14 c |
| P (mg kg−1) | 850.1 ± 61.2 b | 1031.6 ± 38.6 a | 811.7 ± 9.2 b | 800.6 ± 101.0 b |
| K (g kg−1) | 20.29 ± 0.35 b | 22.65 ± 0.17 a | 22.04 ± 0.41 a | 19.68 ± 0.35 b |
| S (%) | 0.057 ± 0.005 b | 0.023 ± 0.002 b | 0.018 ± 0.001 b | 0.167 ± 0.037 a |
| AN (mg kg−1) | 283.85 ± 34.84 a | 115.55 ± 10.33 b | 106.51 ± 15.38 b | 78.61 ± 20.35 b |
| AP (mg kg−1) | 464.8 ± 34.76 a | 304.2 ± 30.43 b | 266.1 ± 12.64 b | 324.3 ± 38.52 b |
| AK (mg kg−1) | 28.85 ± 1.82 a | 26.51 ± 3.14 a | 6.65 ± 0.49 b | 7.31 ± 1.40 b |
| CN (mg kg−1) | 0.088 ± 0.005 a | 0.050 ± 0.029 b | 0.027 ± 0.003 c | 0.056 ± 0.008 b |
Different letters (a, b, c) in a line indicate significant differences between the four sites (Tukey’s test, p < 0.05). NG = native grassland; REn = restoration by Elymus nutans; RPc = restoration by Picea crassifolia; NV = nonvegetated; EC = electric conductivity; SOM = soil organic matter; N = total nitrogen; P = total phosphorus; K = total potassium; AN = available nitrogen; AP = available phosphorus; AK = available potassium; CN = cyanide. Same as follows.