Forest style | Single factor pollution index | Composite pollution index | Composite pollution level | ||
Cr | Cu | Zn | |||
P. massoniana | 0.62 | 1.29 | 0.37 | 1.06 | light pollution |
S. superba | 0.85 | 1.30 | 0.42 | 1.10 | light pollution |
L. formosana | 0.66 | 1.38 | 0.40 | 1.13 | light pollution |
P. massoniana × L. formosana | 0.79 | 1.36 | 0.40 | 1.13 | light pollution |
P. massoniana × S. superba | 1.13 | 1.57 | 0.51 | 1.34 | light pollution |
Mean | 0.81 | 1.38 | 0.42 |
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Individual pollution grade | early warning | light pollution | Non- pollution |
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