用电位滴定（PT）法、盐滴定（ST）法和盐滴定一电位满定（STPT）法3种方法，测定了4种可变电荷土壤的电荷零点（PZC），并对不同方法所得的结果进行了初步比较。棕红壤、红壤、赤红壤和砖红壤由PT法所得的PZC分别为3．10、3．60、3．75和4．40，ST法和STPT法所得的结果相当，PZC分别为3．4，4．1，3．9和4．5。由PT法所得的PZC低于由ST和STPT法所得的PZC，不同方法所得结果之间的差异，值得进一步研究。 Three methods of potentiometric titration (PT), salt titration (ST) and salt titration (STPT) were used to determine the charge zero (PZC) of four variable charge soils. The effects of different methods The results of a preliminary comparison. The PZC obtained by PT method were 3.10, 3.60, 3.75 and 4.40 respectively for brown red soil, red soil, latosolic red soil and brick red soil. The results obtained by ST method and STPT method are quite similar, PZC was 3.4 , 4.1, 3.9 and 4.5. PZC obtained by the PT method is lower than the PZC obtained by the ST and STPT method, the difference between the results obtained by different methods, deserves further study.