Table 1.
The contribution proportions and cumulative proportion contributions of the top 10 indicators in principle component analysis (PCA).
| Bioclimatic Variables |
Description | Units | Contribution Percentages | Rankings |
|---|---|---|---|---|
| alt | Elevation | m | 52.4 | 1 |
| bio12 | Annual precipitation | mm | 15.3 | 2 |
| bio7 | Temperature annual range (BIO5–BIO6) | °C | 15.1 | 3 |
| bio3 | Isothermality (BIO2/BIO7 × 100) | % | 6.6 | 4 |
| an | Available nitrogen | mg/kg | 3.9 | 5 |
| bio4 | Temperature seasonality (standard deviation × 100) | % | 2.8 | 6 |
| bio15 | Precipitation seasonality (coefficient of variation) | 1 | 2.2 | 7 |
| bio1 | Annual mean temperature | °C | 0.8 | 8 |
| tk | Total potassium | mg/L | 0.5 | 9 |
| ap | Available phosphorus | mg/kg | 0.4 | 10 |