Abstract:Tub experiment was carried out to investigate the influence of conditioners on the soil pH, cation exchange capacity (CEC), the distribution and migration of soil Cd concentration, and soil Cd fraction when exposed to high Cd pollution (40 mg/kg). Four conditioners were organic-inorganic composite conditioner, inorganic polymer compound conditioner, polyacrylate compound conditioner, and organic polymer compound conditioner. The results showed that:(1) Four conditioners increased the soil pH and CEC,and the inorganic polymer compound conditioner worked the best in the 0-20 cm soil layer, increased by 0.43 units and 4.43 cmol/kg respectively. (2) The use of four conditioners improve the transformation of exchangeable Cd to other forms. Correlation analysis showed that there was a significant negative correlation between carbonate and exchangeable Cd (P<0.01), and showed particularly prominent effect at 0-20 cm and 20-40 cm soil layer. The use of inorganic polymer compound conditioner showed the best reduction of the soil exchangeable Cd, reduced 3.61 mg/kg. (3) Soil pH and CEC were negatively correlated with the concentration of soil exchangeable Cd in all soil layers and positively correlated with other forms. That is, the conditioners affect the soil cadmium distribution and migration by changing the soil pH and soil CEC, thereby reducing the effectiveness of cadmium, and improving the soil environment.