Cation exchange capacity (CEC) is one of the most important properties of soils. The NH 4 OAc (pH = 7.0) exchange method is usually recommended to determine CEC (CEC 1 ) of all soils with different pH values, particularly for studies on soil taxonomy. But comparatively the BaCl 2 -MgSO 4 forced-exchange method is more authentic in determining CEC (CEC 2 ) of tropical and subtropical highly-weathered acid soils. But so far little is known about the difference between CEC 1 and CEC 2 . In this study, the physiochemical data of 114 acid B horizon soils from 112 soil series of tropical and subtropical China were used, CEC 1 and CEC 2 were determined and compared, the influencing factors were analyzed for the difference between CEC 1 and CEC 2 , and then a regression model was established between CEC 1 and CEC 2 . The results showed that CEC 2 was significantly lower than CEC 1 (p < 0.01), CEC 2 was 14.76% - 63.31% with a mean of 36.32% of CEC 1 . In view of the contribution to CEC from other properties, CEC 2 was mainly determined by pH (45.92%), followed by silt (21.05%), free Fe 2 O 3 (17.35%) and clay contents (12.76%), CEC 1 was mainly decided by free Fe 2 O 3 content (40.38%), followed by pH (28.39%) and silt content (27.29%; and the difference between CEC 1 and CEC 2 was mainly affected by free Fe 2 O 3 (50.92%), followed by silt content (26.46%) and pH (21.80%). The acceptable optimal regression model between CEC 2 and CEC 1 was established as CEC 2 = 2.3114 × CEC 1 1.1496 (R 2 = 0.410, P < 0.001, RMSE = 0.15). For the studies on soil taxonomy, the BaCl 2 -MgSO 4 forced-exchange method is recommended in determining CEC of the highly-weathered acid soils in the tropical and subtropical regions.
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