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Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment - a field experiment in Hunan, China

文献类型： 外文期刊

作者： Zheng, Ruilun 1 ; Chen, Zheng 1 ; Cai, Chao 3 ; Tie, Baiqing 4 ; Liu, Xiaoli 4 ; Reid, Brian J. 5 ; Huang, Qing 3 ; Lei, 1 ;

作者机构： 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Res & Dev Ctr Grasses & Environm, Beijing 100097, Peoples R China

3.Chinese Acad Sci, Inst Urban Environm, Xiamen 361003, Peoples R China

4.Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Hunan, Peoples R China

5.Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England

6.Vilnius Gediminas Tech Univ, Inst Environm Protect, LT-10223 Vilnius, Lithuania

关键词： Biochar;Metal(loid);Rice (Oryza sativa L.);Soil contamination;Hazard quotient

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： A field experiment was conducted to investigate the effect of bean stalk (BBC) and rice straw (RBC) biochars on the bioavailability of metal(loid)s in soil and their accumulation into rice plants. Phytoavailability of Cd was most dramatically influenced by biochars addition. Both biochars significantly decreased Cd concentrations in iron plaque (35-81 %), roots (30-75 %), shoots (43-79 %) and rice grain (26-71 %). Following biochars addition, Zinc concentrations in roots and shoots decreased by 25.0-44.1 and 19.9-44.2 %, respectively, although no significant decreases were observed in iron plaque and rice grain. Only RBC significantly reduced Pb concentrations in iron plaque (65.0 %) and roots (40.7 %). However, neither biochar significantly changed Pb concentrations in rice shoots and grain. Arsenic phytoavailability was not significantly altered by biochars addition. Calculation of hazard quotients (HQ) associated with rice consumption revealed RBC to represent a promising candidate to mitigate hazards associated with metal(loid) bioaccumulation. RBC reduced Cd HQ from a 5.5 to 1.6. A dynamic factor's way was also used to evaluate the changes in metal(loid) plant uptake process after the soil amendment with two types of biochar. In conclusion, these results highlight the potential for biochar to mitigate the phytoaccumulation of metal(loid)s and to thereby reduce metal(loid) exposure associated with rice consumption.

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