A study on the mixture repairing effect of biochar and nano iron oxide on toxicity of Cd toward muskmelon

文献类型： 外文期刊

第一作者： Zou, Zhengkang

作者： Zou, Zhengkang;Huang, Jiali;Lei, Zhen;Wan, Fengting;Li, Junli;Wang, Yunqiang;Dai, Zhaoyi;Yi, Licong;Wang, Yunqiang;Dai, Zhaoyi;Yi, Licong

作者机构：

关键词： Biochar; Nano iron oxide; Cd toxicity; Muskmelon

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 266 卷

页码：

收录情况： SCI

摘要： Soil contamination with cadmium (Cd) has become a serious problem, adversely affecting food safety and human health. Effective methods are urgently needed to alleviate toxicity of Cd in plants. In this study, a nine-week continuous pot experiments was conducted to explore the effectiveness of the different nano iron oxide (alpha-Fe2O3, gamma-Fe2O3, Fe3O4) alone and combined with biochar in muskmelon grown on a Cd-contaminated soil. The antioxidant system, chlorophyll, soluble protein, other physiological indexes of muskmelon leaves and the distribution of Cd in matrix soil, leaves and fruit were detected. The results showed that Cd was readily absorbed by plants and caused oxidative stress on plants, while biochar, alpha-Fe2O3 nanoparticles (NPs) and their mixture group (BFe1 group) could significantly improve it. Specifically, the three treatments reduced the Cd content of the fruit by 19.51-78.86%, reduced the Cd content of leaves by 15.44-36.23% and 22.36-31.77% in weeks 3 and 5, respectively. For the activity of enzymes, three treatments decreased superoxide dismutase (SOD) activity and catalase (CAT) activity by 3.41-38.57% and 24.27-30.33% in week 7, respectively. So BFe1 group application immobilized Cd in soil and reduced Cd partitioning in the aboveground tissues. Overall the combination of biochar and alpha-Fe2O3 NPs can alleviate Cd toxicity in muskmelon and can protect human beings from Cd exposure. (C) 2020 Elsevier Ltd. All rights reserved.

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