highly significantp < 0.01
Overall, compared with the pure plantation (P), the mixed plantation (M) experienced significant ( p < 0.05) or highly significant ( p < 0.01) increases in the contents of NH 4 + , TN, TP, AK, AP, and SOC, while the pH and NO 3 − concentration were significantly lower ( p < 0.05 or p < 0.01).