highly significantP < 0.05
Relationship between PSMs, phosphatases, and phosphorus forms Mantel_r analysis on soil phosphorus forms and PSMs revealed that PSMs have a highly significant positive correlation with TP, H 2 O-Pi, H 2 O-Po, NaHCO 3 -Pi, NaHCO 3 -Po, NaOH-Pi, HCl-Pi, HCl-Po, alkaline phosphatase (ALP), and Residual P ( P < 0.05), with the greatest impact ( r value) on HCl-Pi, HCl-Po, ALP, and Residual P ( Fig. 7 ).