Fig. 5
From: Tree regeneration characteristics in limestone forests of the Cat Ba National Park, Vietnam
Correlation circle of variables with the highest loading on first (PC1) and second principal component (PC2). Names of variables are defined in Table 5. The length of the vectors shows the strength of the correlation between PC scores and environmental variable. The angle of the vectors with each axis is the level of correlation of variables to each principal component. Vectors pointing in the same direction illustrate a positive correlation among variables. In contrast, vectors pointing in opposite directions indicate negative correlations among variables