Arsenic and cadmium load in rice tissues cultivated in calcium enriched biochar amended paddy soil

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;Arafat, Md Yasir;Khan, Zulqarnain Haider;Ma, Jie;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： Eggshell-corncob biochar; Paddy soil; Bioavailability; Arsenic; Cadmium; Rice yield

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2021 年 283 卷

页码：

收录情况： SCI

摘要： Arsenic (As) and cadmium (Cd) are unnecessary metal(loids) toxic at high concentration to plants and humans, hence lessening their rice grain accumulation is crucial for food security and human healthiness. Charred eggshell (EB), corncob biochar (CB), and eggshell-corncob biochar (ECB) were produced and amended to As and Cd co-polluted paddy soil at 1% and 2% application rates to alleviate the metal(loids) contents in rice grains using pot experiments. All the amendments increased paddy yields at 1%, while EB at 2% significantly reduced the yields compared to untreated control. The resulting yield loss in 2%EB was from the combined effects of its high CaCO3 supplementation, and the increment of rhizosphere soil pH which could insolubilize plant nutrients. The amendments were inefficient in decreasing rice grain As (As-Grain), but all the treatments significantly reduced the rice grain Cd (Cd-Grain) at both 1% (44.4-77.1%) and 2% (79.8-91.5%) application rates compared to that of control. Regression analysis for contribution weights of control factors revealed that rhizosphere soil Eh and pH were vital influential factors regulating the As-Grain, whereas porewater Cd was main factor controlling Cd-Grain, accumulation. These investigations indicated that the Ca-enriched eggshell-corncob biochar even at high application rate (i.e., 2%ECB) could be a potential tactic for grain accumulation remediation of the cationic pollutant (i.e., Cd) from the paddy soil to rice grain scheme with concurrent increase in rice yields.

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