Table 2.
The contribution proportions and cumulative proportion contributions of the top 10 indicators in principle component analysis (PCA).
| Variable | Meaning | Percentage of variance (%) | Cumulative percentage (%) |
|---|---|---|---|
| ASL | Elevation (m) | 60.5 | 60.5 |
| Bio18 | Precipitation of warmest quarter (mm) | 16.6 | 77.1 |
| Bio11 | Mean temperature of coldest quarter (°C) | 3.9 | 81.0 |
| T_TEB | Topsoil TEB (cmol/kg) | 3.4 | 84.4 |
| Bio12 | Annual precipitation (mm) | 3.3 | 87.7 |
| Bio6 | Min temperature of coldest month (°C) | 2.3 | 90.0 |
| T_CASO4 | Topsoil gypsum (% weight) | 1.2 | 91.2 |
| T_CEC_CLAY | Topsoil CEC (clay) (cmol/kg) | 1.1 | 92.3 |
| Bio14 | Precipitation of driest month (mm) | 0.8 | 93.1 |
| AWC_CLASS | AWC range | 0.8 | 93.9 |