Depletion of bioavailable As/Cd with rice plant from paddy soils of high contamination risk
文献类型： 外文期刊
作者： Yan, Lu 1 ; Wang, Xin 1 ; Ji, Xionghui 3 ; Peng, Bo 1 ;
作者机构： 1.Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China
2.Hunan Normal Univ, Key Lab Environm Heavy Metal Contaminat & Ecol Re, Changsha 410081, Hunan, Peoples R China
3.Hunan Univ, Longping Branch, Grad Sch, Changsha 410125, Peoples R China
4.Hunan Acad Agr Sci, Hunan Inst Agroenvironm & Ecol, Key Lab Prevent Control & Remediat Soil Heavy Met, Changsha 410125, Peoples R China
5.Minist Agr, Key Lab Agrienviron Midstream Yangtze River Plain, Changsha 410125, Peoples R China
关键词： Plant uptake; Arsenic; Cadmium; DGT; Rice plant
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： 2021 年 289 卷
页码：
收录情况： SCI
摘要： Co-uptake and high accumulation of As and Cd by rice is an outstanding issue threatening public health. From the viewpoint of soil cleanup, however, efficient As/Cd extraction by this paddy-adapted plant, followed by biomass removal, could provide a major pathway depleting As/Cd accumulation in paddy soils and thus inhibiting their transfer in food chain. Here a field trial was performed to identify the significance of As/Cd cleanup from paddy soil by rice. 88 % and 51 % of total extracted As and Cd were retained in root. To eliminate specifically rice-available As/Cd pool and obstruct their cycling back to soil, one crop of rice root was removed, leading to the depletion of 46 % and 69 % of plant available As (soluble & exchangeable) and Cd (exchangeable & carbonate-bound), respectively. In the following cultivation on the post-cleanup field, polished rice As fell from 0.23 mg kg(-1) to 0.12 mg kg(-1), markedly lower than the Chinese (WHO) limit (0.2 mg kg(-1)). Meanwhile, white rice Cd decreased by 24 %. This field work identified that As/Cd co-extraction by paddy-adapted rice plant, followed by root removal, as a primary step toward rice safety in areas with high contamination risk but little reserved paddy resources.
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