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| Sites | Type | Slope (°) | Tree coverage (%) | Age (year) |
|---|---|---|---|---|
| Black locust | Planted forest | 26 | 60 | 30 |
| Oriental arborvitae | Non-typical natural forest | 10 | 35 | 50 |
| Liaodong oak | Secondary natural forest | 22 | 75 | 60 |
| Shrub land | Mixed natural shrub | 10 | 80 | >60 |
| Bare land | Un-forested | 10 | 0 | 30 |
