| Parameters |
Mine spoil collected from different age series coal mine overburdens |
Native Forest soil (NF) |
| OB0 |
OB2 |
OB4 |
OB6 |
OB8 |
OB10 |
| Amylase activity
(μg glucose/g/hr) |
nd |
1.253 ± 0. 124 |
2.034 ± 0.112 |
2.263± 0.171 |
3.655 ± 0.279 |
4.571 ± 0.205 |
13.124 ± 1.153 |
| Invertase activity
(μg sucrose/g/hr) |
nd |
6.642 ± 0.498 |
25.228 ± 5.211 |
83.331 ± 4.781 |
121.013 ± 7.372 |
348.331 ± 4.636 |
849.335 ± 6.389 |
| Protease activity
(μg tyrosine/g/hr) |
nd |
3.042 ± 0.058 |
8.801 ± 0.534 |
23.692 ± 1.428 |
28.437 ± 2.127 |
39.266 ± 2.574 |
215.813 ± 12.911 |
| Urease activity
(μg NH4+/g/hr) |
nd |
3.354 ± 0.027 |
5.299 ± 0.121 |
9.463 ± 0.261 |
14.317± 1.032 |
20.121 ± 1.576 |
58.451 ± 2.834 |
| Phosphatase activity
(μg PNP/g /hr) |
nd |
nd |
10.108 ± 1.005 |
26.495 ± 1.554 |
35.407 ± 2.901 |
49.617 ± 2.250 |
92.118 ± 3.107 |
| Dehydrogenase activity
(μg TPF/g /hr) |
0.056 ± 0.011 |
0.144 ± 0.039 |
0.291 ± 0.034 |
0.458 ± 0.052 |
0.948 ± 0.041 |
1.275 ± 0.043 |
4.006 ± 0.115 |
nd: Not detectable. Values are mean ± SD, calculated from seasonal (summer, rainy, winter) mean values.