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

Zheng, Ruilun, Chen, Zheng, Cai, Chao, Tie, Baiqing, Liu, Xiaoli, Reid, Brian, Huang, Qiang, Lei, Ming, Sun, Guoxin and Baltrenaite, Edita (2015) Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China. Environmental Science and Pollution Research, 22 (14). pp. 11097-11108. ISSN 0944-1344

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Abstract

A field experimentwas 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 iochars 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.

Item Type: Article
Uncontrolled Keywords: biochar metal(loid),rice(oryza sativa l.),soil contamination,hazard quotient
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Pure Connector
Date Deposited: 01 Apr 2015 12:56
Last Modified: 01 Apr 2019 12:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/53009
DOI: 10.1007/s11356-015-4268-2

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