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《China Environmental Science》 2014-11
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Effects of biochar and chicken manure on cadmium uptake in pakchoi cultivars with low cadmium accumulation

WANG Lin;XU Ying-ming;LIANG Xue-feng;SUN Yue-bing;LIN Da-song;DONG Ru-yin;Key Laboratory of Original Agro-environmental Quality, Ministry of Agriculture, Tianjin Key Laboratory of Agro-environment and Agro-product Safety, Department of Pollution Control,Agro-environmental Protection Institute, Ministry of Agriculture;  
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.
【Fund】: 国家自然科学基金项目(40901154 21177068 21107056);; 农业科技成果转化资金项目(2012GB23260546);; 公益性行业(农业)科研专项(201203045);; 天津市自然科学基金项目(14JCYBJC30300)
【CateGory Index】: X173
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