Table 1 Statistical summary of HMs concentrations (mg kg−1) in soil, and TN, TP, TK, OM (g kg−1) and soil pH.
Elements | Mean | S.D | Median | Min | Max | CV% | Background valuesa | Threshold valuesb | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
A | B | C | D | ||||||||
Cd | 0.221 | 0.069 | 0.210 | 0.082 | 0.83 | 31.05 | 0.25 | 0.3 | 0.3 | 0.3 | 0.6 |
Hg | 0.155 | 0.090 | 0.130 | 0.022 | 0.88 | 58.13 | 0.08 | 1.3 | 1.8 | 2.4 | 3.4 |
As | 9.76 | 2.08 | 9.43 | 4.17 | 18.0 | 21.35 | 9.11 | 40 | 40 | 30 | 25 |
Pb | 32.2 | 5.0 | 32.3 | 19.8 | 90.3 | 15.42 | 30.3 | 70 | 90 | 120 | 170 |
Cr | 91.9 | 10.0 | 92.3 | 61.7 | 264 | 10.87 | 78 | 150 | 150 | 200 | 250 |
Cu | 35.2 | 21.1 | 34.4 | 18.5 | 607 | 59.93 | 28.1 | 50 | 50 | 100 | 100 |
Ni | 37.1 | 3.7 | 37.2 | 23.6 | 56.6 | 10.07 | 33.5 | 60 | 70 | 100 | 190 |
Zn | 108.8 | 62.9 | 106.0 | 55 | 1820 | 57.80 | 82.2 | 200 | 200 | 250 | 300 |
pH | 6.17 | 1.01 | 5.96 | 4.16 | 9.04 | 16.40 | 6.14 | – | – | – | – |
TN | 1.33 | 0.26 | 1.30 | 0.70 | 2.40 | 19.6 | – | – | – | – | – |
TP | 1.16 | 0.79 | 1.11 | 0.22 | 20.8 | 68.14 | – | – | – | – | – |
TK | 23.6 | 2.4 | 24.3 | 10.3 | 28.0 | 10.15 | – | – | – | – | – |
OM | 17.7 | 5.1 | 17.6 | 2.4 | 43.8 | 28.62 | – | – | – | – | – |
