3.4 Correlation analysis
Significant and positive correlations were observed for DOC vs. pH, TP, MOC, PLFA, BAC, ACT, PRO, and OB, while the opposite correlations were found for DOC vs. BW, C:N, C:P, N:P, and COPC. For SOC, positive correlations were found with BW, C:N, C:P, and CPOC, while negative correlations were observed with SWC, FOPC, MOC, PLFA, PRO, and OB to a significant level (Fig.2).