Abstract:Under the pot experiment, DBP/DEHP was added exogenously with the concentrations of 0,20,50,100,200 mg/kg respectively to study the effect of PAEs on tobacco growth and its accumulation characteristics in soil-tobacco systems. The results showed that the addition of exogenous DBP/DEHP had no significant effect on the aboveground biomass and stem diameter of tobacco, and the plant height of tobacco showed different trends with the concentration of exogenous DBP/DEHP. The plant height of tobacco remained unchanged in yellow soil, decreased in yellow brown soil, and increased in red soil. The root activity of yellow soil decreased with the increase of exogenous DBP/DEHP concentration, while there was no significant change in yellow brown soil. DBP/DEHP concentration had a significant effect on tobacco antioxidant ezyme activity in some soils, but had no effect on soil denydrogenase and urease activity. With the increase of the concentrations of PAEs, the DBP/DEHP contents in the soil increased, with the highest increase for the DBP contents in the yellow brown soil, which reached its 3.56 times that of CK under the 200 mg/kg DBP. The concentrations of DEHP in yellow brown soil and red soil increased significantly, which were 27.47 times and 27.34 times of CK, respectively when adding 200 mg/kg DEHP. Compared with CK, most tobacco leaves and roots were improved in DBP/DEHP with different degrees. With the increase of the concentration of exogenous DBP/DEHP, the accumulation of DBP/DEHP in soil and tobacco leaves will be promoted to some extent.