Abstract:
In order to investigate the accumulative effect of the plants enriched Cd and the intercropping of vegetables on the content of Cd in the vegetables and soil, and select the intercropping combinations that could reduce the Cd pollution in the vegetables and soil, the six cultivars of Indian
Brassica juncea with highly enriched Cd and
Brassica napus which belonged to the same genus were selected and the field experiment was carried out by intercropping
Brassica juncea in the moderately Cd-contaminated soils. Then, the effects of the intercropping on the plant biomass, the content of Cd in the plants and soil, and the microenvironment of root soil were evaluated. The results showed that the biomass of Indian
Brassica juncea and Jiajiaduolacai was relatively small, while the biomass of five species of
Brassica napus, such as Jiangshan Jinhuang, was relatively large. The intercropping with different plants had no significant effect on the yield of
Brassica juncea. By comparing the contents of Cd, the extraction of Cd from soil and the enrichment coefficient in the tested plants, the order was Indian
Brassica juncea>
Brassica juncea>
Brassica napus>
Brassica rapa>
Brassica juncea, while for the comparison of the extraction rate of Cd from soil, the order was as follows:intercropping with Indian
Brassica juncea>intercropping with
Brassica juncea>intercropping with
Brassica napus>intercropping with
Brassica rapa>intercropping with
Brassica juncea. There was little difference in the soil pH and redox ion exchange capacity among different treatments. When the Indian
Brassica juncea was intercropped with
Brassica juncea, the content of cadmium in the soil in season decreased. And there was little difference in the content of Cd in soil in season among other combinations. The Cd content of
Brassica juncea intercropped with different plants would be increased or decreased. In conclusion, the intercropping of
Brassica juncea with Indian
Brassica juncea would reduce the content of Cd in the soil in season, while the intercropping of
Brassica juncea with Brassica napus, such as Jiangshan Jinhuang, Sanyuehuang and Zhongyou 828, would reduce the Cd content in the overground part.