FIGURE 3.
Multivariate statistical analysis based on the concentration of PLFAs. Scores plot of principal component analysis (a). Scores along the two principal components (PC1: 55.5% and PC2: 28.0%) explained 83.5% of the total variability. Results of cluster analysis (b). Y1‐Y50 represents 1‐, 5‐, 20‐, 50‐year Zaopeis (ZPs), respectively. U, M, and L represents upper‐layer, middle‐layer, and lower‐layer ZPs, respectively