Table 4 The CATREG coefficients and significance test of different factors
Influence factor | As | Cu | Mn | |||
|---|---|---|---|---|---|---|
Beta | Sig | Beta | Sig | Beta | Sig | |
Road distance | − 0.093 | 0.802 | − 0.109 | 0.954 | 0.081 | 0 |
Industrial activity | − 0.089 | 0.84 | − 0.383 | 0.179 | − 0.35 | 0 |
Air quality index | 0.289 | 0.58 | 0.007 | 0.987 | − 0.281 | 0 |
Soil parent material | − 0.443 | 0.63 | 0.329 | 0.547 | 0.46 | 0 |
Slope | 0.334 | 0.661 | − 0.402 | 0.416 | − 0.374 | 0 |
Population density | − 0.344 | 0.435 | − 0.587 | 0.281 | 0.293 | 1 |
Soil type | 0.651 | 0.414 | − 0.142 | 0.815 | − 0.388 | 0 |
NDVI | 0.235 | 0.61 | 0.098 | 0.958 | − 0.176 | 0 |
Water environment quality | − 0.619 | 0.179 | − 0.389 | 0.506 | − 0.191 | 0 |