Abstract: Chinese cabbage, black soil and brown soil were selected to investigate the transfer characteristics of sulfadiazine (SDZ) and sulfamethazine (SMT) and the influence factors in soilplant system using leaching and pot experiments. The results showed that SDZ had higher transfer ability than SMT in soil. The transfer ability of SDZ and SMT decreased with the increase of soil depth. With prolonged leaching time and increased antibiotic concentration, the transfer ability of SDZ and SMT increased in the same soil layers. The transfer ability of sulfonamides differed with soil type. The transfer ability of SDZ and SMT was higher in brown soil than in black soil. The absorption and transfer of the sulfonamides in plants was impacted by their transfer ability in soil. Chinese cabbage took up more SDZ rather than SMT, and the sulfonamides were mainly detected in the stem and leaf of Chinese cabbage. With the increase of sulfonamide concentration, the residue concentration of sulfonamides in Chinese cabbage was increased. The concentrations of SDZ and SMT in Chinese cabbage were higher in brown than in black soil.

Key words: Larix kaempferi, amino sugars, aggregate, N-fixing tree species.