Table 1 Categorical environmental factors collected in the field (Lower rank indicates better forest condition and higher values indicate bad forest condition; while soil depth, humus depth and erosion status were assessed into five ranks, grazing, cutting and fire incidence were ranked into four)
Factors | Ranks | ||||
|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | |
Soil Depth (cm) | > 100 | 75–100 | 50–75 | 25–50 | 0–25 |
Humus Depth (cm) | > 10 | 5–10 | 2–5 | 0–2 | 0 |
Erosion | Absent | Low | Moderate | high | Very high |
Grazing | Absent | Low | Medium | High | – |
Cutting | Absent | Low | Medium | High | – |
Fire incidence | Absent | Low | Medium | High | – |