Effect of calcium and iron-enriched biochar on arsenic and cadmium accumulation from soil to rice paddy tissues

文献类型： 外文期刊

第一作者： Islam, Md Shafiqul

作者： Islam, Md Shafiqul;Magid, Abdoul Salam Issiaka Abdoul;Chen, Yali;Weng, Liping;Ma, Jie;Arafat, Md Yasir;Khan, Zulqarnain Haider;Li, Yongtao;Li, Yongtao;Islam, Md Shafiqul;Magid, Abdoul Salam Issiaka Abdoul;Arafat, Md Yasir;Khan, Zulqarnain Haider;Weng, Liping

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关键词： Corncob-eggshell biochar; As; Cd; Paddy soil; Rice yield

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 785 卷

页码：

收录情况： SCI

摘要： Arsenic (As) and cadmium (Cd) are nonessential toxic metal(loids) that are carcinogenic to humans. Hence, reducing the bioavailability of these metal(loids) in soils and decreasing their accumulation in rice grains is essential for agroecology, food safety, and human health. Iron (Fe)-enriched corncob biochar (FCB), Fe-enriched charred eggshell (FEB), and Fe-enriched corncob-eggshell biochar (FCEB) were prepared for soil amelioration. The amendment materials were applied at 1% and 2% application rates to observe their alleviation effects on As and Cd loads in rice paddy tissues and yield improvements using pot trials. The FCEB treatment increased paddy yields compared to those of FCB (9-12%) and FEB (3-36%); this could be because it contains more plant essential nutrients than FCB and a lower calcite content than that of FEB. In addition, FCEB significantly reduced brown rice As (AsBR, 29-60%) and Cd (CdBR, 57-81%) contents compared to those of the untreated control (CON). At a 2% application rate, FCEB reduced the average mobility of As (56%) and Cd (62%) in rhizosphere porewater and enhanced root Fe-plaque formation (76%) compared to those of CON. Moreover, the enhanced Fe-plaque sequestered a substantial amount of As (171.4%) and Cd (90.8%) in the 2% FCEB amendment compared to that of CON. Pearson correlation coefficients and regression analysis indicated that two key mechanisms likely control AsBR and CdBR accumulations. First, rhizosphere soil pH and Eh controlled As and Cd availabilities in porewaters

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