Abstract：A field experiment was conducted to investigate the effects of biochar and chicken manure on the growth and cadmium (Cd) accumulation of low Cd accumulating Brassica chinensis grown in a vegetable farmland contaminated by sewage water irrigation, and the immobilization mechanism was elucidated through fractionation of cadmium in the tested soil. Results showed that addition of these additives increased the shoot yield of tested cultivars of Brassica chinensis. The effect of combined applications of high-dose biochar and chicken manure was the most significant, where the yield increased by 174% as compared with the control. The application of these additives significantly decreased shoot Cd concentration of tested cultivars. The effect of combined application of high-dose biochar and chicken manure was the most significant, where the shoot Cd concentration decreased by 72.0% compared with the control, and the shoot Cd concentration of all tested cultivars were lower than the maximum level permitted by the National Food Safety Standard of China (GB2762-2012). The application of these additives could significantly reduce extractable Cd concentration through toxicity characteristic leaching procedure (TCLP) with a maximal reduction rate of 36.5%. The use of biochar and chicken manure could promote transformation of exchangeable Cd into organic bound or residual fractions, resulting in significant reduction of Cd bioavailability and mobility. These data revealed that a combination of planting low Cd accumulating cultivars and applications of biochar and chicken manure could meet the requirement of safe production of Brassica chinensis in Cd polluted soils.
王林, 徐应明, 梁学峰, 孙约兵, 林大松, 董如茵. 生物炭和鸡粪对镉低积累油菜吸收镉的影响[J]. 中国环境科学, 2014, 34(11): 2851-2858.
WANG Lin, XU Ying-Ming, LIANG Xue-Feng, SUN Yue-Bing, LIN Da-Song, DONG Ru-Yin. Effects of biochar and chicken manure on cadmium uptake in pakchoi cultivars with low cadmium accumulation. . CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(11): 2851-2858.
