Paddy periphyton reduced cadmium accumulation in rice (Oryza sativa) by removing and immobilizing cadmium from the water-soil interface
文献类型： 外文期刊
作者： Lu, Haiying 1 ; Dong, Yue 1 ; Feng, Yuanyuan 1 ; Bai, Yanchao 2 ; Tang, Xianjin 3 ; Li, Yuncong 4 ; Yang, Linzhang 1 ; Li 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Salt Soil Agr Ctr, Inst Agr Resource & Environm, Key Lab Agr Environm Lower Reaches Yangtze River, 50 Zhongling Rd, Nanjing 210014, Peoples R China
2.Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou, Jiangsu, Peoples R China
3.Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Hangzhou 310058, Peoples R China
4.Univ Florida, Trop Res & Educ Ctr, Inst Food & Agr Sci, Dept Soil & Water Sci, Homestead, FL 33031 USA
5.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, 71 East Beijing Rd, Nanjing 210008, Peoples R China
关键词： Periphytic biofilm; Cadmium fractionation; Bioavailability; Immobilization; Paddy field
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 261 卷
页码：
收录情况： SCI
摘要： Periphyton plays a significant role in heavy metal transfer in wetlands, but its contribution to cadmium (Cd) bioavailability in paddy fields remains largely unexplored. The main aim of this study was to investigate the effect of periphyton on Cd behavior in paddy fields. Periphyton significantly decreased Cd concentrations in paddy waters. Non-invasive micro-test technology analyses indicated that periphyton can absorb Cd from water with a maximum Cd2+ influx rate of 394 pmol cm(-2) s(-1) and periphyton intrusion significantly increased soil Cd concentrations. However, soil Cd bioavailability declined significantly due to soil pH increase and soil redox potential (Eh) decrease induced by periphyton. With periphyton, more Cd was adsorbed and immobilized on organic matter, carbonates, and iron and manganese oxides in soil. Consequently, Cd content in rice decreased significantly. These findings give insights into Cd biogeochemistry in paddy fields with periphyton, and may provide a novel strategy for reducing Cd accumulation in rice. (C) 2020 Elsevier Ltd. All rights reserved.
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