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Accumulation and distribution of zinc in rice plants (Oryza sativa L.) growing in zinc contaminated paddy soils with biochar

文献类型： 外文期刊

作者： Li, Honghong 1 ; Li, Zhou 3 ; Xie, Shengcong 1 ; Huang, Yongxin 1 ; Chen, Miaofen 1 ; Xie, Tuanhui 1 ; Wang, Guo 1 ;

作者机构： 1.Fujian Agr & Forestry Univ, Coll Resources & Environm, Fujian Prov Key Lab Soil Environm Hlth & Regulat, Fuzhou 350002, Fujian, Peoples R China

2.Minnan Normal Univ, Sch Hist & Geog, Zhangzhou 363000, Fujian, Peoples R China

3.Fujian Acad Agr Sci, Subtrop Agr Res Inst, Zhangzhou 363000, Fujian, Peoples R China

关键词： Biochar; Rice; Zinc; Iron plaque; Subcellular distribution

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.968； 五年影响因子：7.317 ）

ISSN： 2213-2929

年卷期： 2022 年 10 卷 1 期

页码：

收录情况： SCI

摘要： At low concentrations zinc (Zn) is essential for plants and animals, but it becomes toxic when it exceeds a critical level. This study aimed to explore the effects of biochar on the remediation of Zn-polluted soil and the distribution of Zn in rice plants using pot experiments. Various amounts of biochar (0% (control), 2.5%, and 5% w/w) derived from rice straw were mixed with Zn-contaminated soil collected from farmland near a mine. The results showed that biochar enhanced the biomass of rice tissues and significantly reduced the concentration of Zn in brown rice. These results could be attributed to the combination of several effects: (1) Biochar increased the soil pH and organic carbon content, resulting in a reduction in the concentration of soil available Zn and transforming forms of immobilized Zn from acid soluble to reducible. (2) Biochar addition decreased the amorphous iron and complex iron concentrations in the soil solution and reduced the formation of root Fe plaques as well as the storage of Zn in iron plaques, thus diminishing the probability of Zn transfer from root surfaces to tissues. (3) Biochar played a key role in abating the toxic effect of Zn in rice plants as it decreased the transfer of Zn from roots to leaves and promoted Zn storage in the vacuoles of root cells. These results suggest that the application of biochar to Zn-contaminated soil is effective in reducing Zn accumulation in rice grains and can enhance rice production.

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