Skip to main content

Table 11 The correlation coefficients of variables with the first three principal components (PC1, PC2, PC3) of the PCA analysis of environmental variables

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
  1. Shown correlation coefficients are significant with a p-value < 0.05