Table 2.
Total and CaCl2 extractable element concentrations in vegetated soils (VS) and non-vegetated soils (NVS).
| NVS |
VS |
Statistics |
||||||
|---|---|---|---|---|---|---|---|---|
| Total (ppm) | CaCl2 extractable (ppm) | Total (ppm) | CaCl2 extractable (ppm) | Total |
CaCl2 extractable |
|||
| P-value | Test value | P-value | Test value | |||||
| Al | 2,708 ± 158 | 3,010 ± 469 | 0.309 | W = 7 | ||||
| As | 6.11 ± 1.24 | 4.13 ± 0.89 | 0.022∗ | t = −2.90 | ||||
| B | 5.13 ± 2.68 | 0.61 ± 0.21 | 3.42 ± 1.27 | 0.40 ± 0.12 | 0.015∗ | t = −3.10 | 0.101 | t = −1.91 |
| Ca | 194,267 ± 19462 | 186,187 ± 8,115 | 0.341 | t = −1.04 | ||||
| Cd | 0.21 ± 0.21 | 0.15 ± 0.21 | 0.824 | W = 14 | ||||
| Co | 16.24 ± 2.53 | 21.54 ± 4.33 | 0.077 | t = 2.11 | ||||
| Cr | 147.48 ± 43.06 | 8.26 ± 4.73 | 186.10 ± 27.67 | 3.79 ± 0.49 | 0.156 | t = 1.60 | 0.151 | W = 20 |
| Cu | 38.50 ± 2.78 | 45.78 ± 7.03 | 0.118 | t = 1.87 | ||||
| Fe | 41,559 ± 4,542 | 0.99 ± 0.24 | 52,198 ± 9,242 | 1.13 ± 0.37 | 0.088 | t = 2.04 | 0.526 | t = 0.667 |
| K | 156.23 ± 17.91 | 6.97 ± 1.53 | 113.02 ± 31.47 | 10.39 ± 4.03 | 0.041∗ | t = −2.58 | 0.136 | t = 1,774 |
| Mg | 4,063 ± 1,336 | 330.87 ± 67.62 | 1,623 ± 372.30 | 141.35 ± 71.13 | 0.001∗∗ | t = −4.88 | 0.002∗∗ | t = −4.318 |
| Mn | 3,167 ± 538.06 | 0.19 ± 0.05 | 4,228 ± 1,023 | 0.16 ± 0.05 | 0.112 | t = 1.863 | 0.409 | t = −0.872 |
| Na | 76.99 ± 24.88 | 8.70 ± 1.58 | 98.54 ± 26.59 | 7.99 ± 1.75 | 0.059 | t = 2.397 | 0.521 | t = −0.671 |
| Ni | 22.15 ± 16.81 | 24.61 ± 18.15 | 0.471 | t = 0.770 | ||||
| P | 45.57 ± 22.63 | 0.14 ± 0.01 | 47.18 ± 24.95 | 0.17 ± 0.03 | 0.758 | t = 0.322 | 0.104 | t = 1.923 |
| Pb | 19.74 ± 3.06 | 21.19 ± 2.91 | 0.841 | W = 11 | ||||
| S | 94,917 ± 32445 | 4,995 ± 233.56 | 83,238 ± 32,415 | 4,808 ± 266.14 | 0.334 | t = −1.065 | 0.272 | t = −1.180 |
| Sb | 4.72 ± 0.62 | 5.99 ± 0.65 | 0.016∗ | t = 3.157 | ||||
| Si | 276.27 ± 75.50 | 9.25 ± 3.07 | 287.06 ± 84.44 | 8.14 ± 0.60 | 0.594 | t = 0.555 | 1 | W = 12 |
| Sr | 97.70 ± 11.66 | 4.57 ± 0.88 | 107.94 ± 15.36 | 5.89 ± 0.76 | 0.151 | W = 5 | 0.035∗ | t = −2.540 |
| Ti | 5,234 ± 1,833 | 0.25 ± 0.07 | 6,564 ± 1,760 | 0.27 ± 0.05 | 0.012∗ | t = 3.306 | 0.619 | t = 3.306 |
| Zn | 83.70 ± 48.75 | 0.03 ± 0.02 | 98.21 ± 52.66 | 0.02 ± 0.00 | 0.233 | t = 1.302 | 0.786 | W = 9 |
Mean values and standard deviations are provided (n = 5). Normally distributed data were analyzed using the parametric Student’s oxt-test (t-values). Data not normally distributed were analyzed using the non-parametric Mann–Whitney–Wilcoxon (W-values). Significant differences are indicated (∗P < 0.05 and ∗∗P < 0.01).