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Selenium translocation in the soil-rice system in the Enshi seleniferous area, Central China
Chuanyu Chang;  Runsheng Yin;  Xun Wang;  Shuxun Shao;  Chongying Chen;  Hua Zhang
2019
Source PublicationScience of The Total Environment
Volume669Pages:83-90
Abstract

Rice is an important source of selenium (Se) exposure; however, the transformation and translocation of Se in the soil-rice system remain poorly understood. Here, we investigated the speciation of Se in Se-rich soils from Enshi, Central China and assessed which Se species is bioavailable for rice grown in Enshi. Extremely high Se concentrations (0.85 to 11.46 mg/kg) were observed in the soils. The soil Se fractions, which include water-soluble Se (0.2 to 3.4%), ligand-exchangeable Se (4.5 to 15.0%), organically bound Se (57.8 to 80.0%) and residual Se (6.1 to 32.9%), are largely controlled by soil organic matter (SOM) levels. Decomposition of SOM promotes the transformation of organically bound Se to water-soluble Se and ligand-exchangeable Se, thereby increasing the bioavailability of Se. The bioaccumulation factors (BAFs) of Se decrease in the following order: roots (0.84 ± 0.30) > bran (0.33 ± 0.17) > leaves (0.18 ± 0.09) > polished rice (0.14 ± 0.07) > stems (0.12 ± 0.07) > husks (0.11 ± 0.07). Selenium levels in rice plants are affected by multiple soil Se fractions in the soil. Water-soluble, ligand-exchangeable and organically bound Se fractions are the major sources of Se in rice tissues.

KeywordSelenium soil rice transformation translocation enshi, China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10197
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Chuanyu Chang;Runsheng Yin;Xun Wang;Shuxun Shao;Chongying Chen;Hua Zhang. Selenium translocation in the soil-rice system in the Enshi seleniferous area, Central China[J]. Science of The Total Environment,2019,669:83-90.
APA Chuanyu Chang;Runsheng Yin;Xun Wang;Shuxun Shao;Chongying Chen;Hua Zhang.(2019).Selenium translocation in the soil-rice system in the Enshi seleniferous area, Central China.Science of The Total Environment,669,83-90.
MLA Chuanyu Chang;Runsheng Yin;Xun Wang;Shuxun Shao;Chongying Chen;Hua Zhang."Selenium translocation in the soil-rice system in the Enshi seleniferous area, Central China".Science of The Total Environment 669(2019):83-90.
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