| 【Objective】The study was conducted to explore the influences of iron modified biochar on the Cadmium
（Cd）uptake, yield and quality of the Chinese cabbage in cadmium contaminated soil.【Method】A pot experiment was
designed with the Cd contaminated soil(as substrate) from the vegetable field in Shaoguan, Guangdong province. Different
proportions of biochar﹝biochar/soil weight =0 (control), 0.1%, 0.3%, 0.5%, 1%﹞ was applied to study the change of
the water soluble, exchangeable cadmium in rhizosphere/non-rhizosphere soil, and the cadmium uptake, quality and
antioxidant enzyme activity of Chinese cabbage.【Result】The results showed that the iron modified biochar treatment could
significantly reduce the water soluble cadmium content in rhizosphere soil compared with that of the control, which was
the lowest in the biochar/soil =0.5% treatment, as 58.55% of the control. And the water soluble cadmium content in non-rhizosphere soil was also decreased significantly. Howerer, there was no significant difference in the exchangeable cadmium
content between the rhizosphere and non-rhizosphere soil with the biochar application. Compared with the control, the biochar
addition could increase the biomass, Vc, soluble sugar and soluble protein content of Chinese Cabbage. And the superoxide
dismutase (SOD), peroxidase (POD) and nitrate reductase (NR) activity in Chinese cabbage were increased significantly with
biochar application While the content of nitrate and the cadmium uptake of Chinese cabbage was reduced.【Conclusion】
The biochar/soil weight =0.5% was the best treatment, which could improve the yield and quality of Chinese cabbage under
the cadmium stress, decrease the water soluble cadmium content in rhizosphere, and reduce the risk of Cd accumulation in
Chinese cabbage. |
