From: Tree regeneration characteristics in limestone forests of the Cat Ba National Park, Vietnam
Principal components | Variables | Acronym | Correlation coefficient |
---|---|---|---|
PC1 | Total site factor | L_TSF | 0.974 |
 | Gap fraction | L_GF | 0.960 |
 | Openness | L_OPN | 0.959 |
 | Indirect site factor | L_ISF | 0.922 |
 | Direct site factor | L_DSF | 0.910 |
 | pH | S_pH | − 0.279 |
 | Ellipsoidal leaf area distribution | L_ELAD | − 0.421 |
 | Leaf area index | L_LAI | − 0.794 |
PC2 | Cation exchange capacity | S_CEC | 0.852 |
 | Rock surface | T_RS | 0.822 |
 | pH | S_pH | 0.785 |
 | Soil moisture | S_SM | 0.733 |
 | Soil humus content | S_SH | 0.727 |
 | Base saturation | S_BS | 0.649 |
 | Slope | T_Sl | 0.596 |
 | Elevation | T_Ele | 0.262 |
 | Clay | S_Clay | 0.245 |
 | Footpaths | H_FP | − 0.214 |
 | Silt | S_Silt | − 0.285 |
 | Hydrolytic acidity | S_HA | − 0.329 |
 | Soil depth | S_SD | − 0.642 |
PC3 | Clay | S_Clay | 0.722 |
 | Silt | S_Silt | 0.542 |
 | Soil depth | S_SD | 0.482 |
 | Soil moisture | S_SM | 0.439 |
 | Animal traps | H_AT | 0.362 |
 | Cation exchange capacity | S_CEC | 0.280 |
 | Leaf area index | L_LAI | 0.256 |
 | Rock surface | T_RS | − 0.223 |
 | Elevation | T_Ele | − 0.235 |
 | Rock in soil | S_SR | − 0.312 |
 | Slope | T_Sl | − 0.369 |
 | Sand | S_Sand | − 0.837 |