| Pot experiments were carried out to study the effects of cadmium levels（0, 50, 100 and 200 mg·kg-1） on the Cd absorption and accumulation of Sonchus asper L. Hill and maize（Zea mays L.） under intercropping system. The results showed that biomass of S. asper and maize increased by 4.8%~64.9% and 4%~33% under intercropping system comparing with monoculture system, respectively. Cd contents of S. asper increased by 31.4%~79.7% under intercropping, except for decreased by 5.6% when soil Cd content was 100 mg·kg-1. Cd content in maize decreased by 18.9%~49.6% under intercropping system when Cd content in the soil ranged from 50 to 200 mg·kg-1. Significantly positive correlations between Cd contents in shoot and root and soil available Cd content were observed with correlation coefficients 0.962（P<0.05） and 0.976（P<0.05） under monoculture system, respectively. Significantly positive correlations between Cd contents in root, stem and leaf and soil available Cd were observed with correlation coefficients 0.991（P<0.01）, 0.959（P<0.05） and 0.977（P<0.05） under intercropping system, respectively. The effective transfer coefficient of Cd in maize was reduced by 21%~71% under intercropping system when soil Cd content ranging from 50 to 200 mg·kg-1. Under both monoculture and intercropping systems, Cd effective transfer coefficient of S. asper was higher than that of maize. The results indicate that uptake and accumulation of Cd in S. asper under intercropping system could be promoted and content of Cd in maize could be reduced. |
