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| Major controlling factors and prediction models of Hg transfer from different soils to Brassica chinensis |
| Received:September 06, 2018 Revised:October 23, 2018 |
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| KeyWord:Brassica chinensis;Hg;soil type;controlling factor;prediction mode |
| Author Name | Affiliation | E-mail | | GAO Yi | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHENG Xiang-qun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | zhengxiangqun@126.com | | YANG Bo | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| The bioavailability, mobility and transfer characteristics of Hg are critical to the environment and food safety. We conducted a greenhouse study, using Brassica chinensis and 18 soils, to investigate the uptake of Hg by plants and to construct a model for predicting the main factors that influence Hg bioavailability.The results showed that the different soil physical and chemical properties and different concentrations of Hg treatment showed diversity in the growth of Brassica chinensis, or promoted (yellow brown soil, black soil, bauxite, fluvoaquic soil), or inhibited (grey desert soil, Hunan paddy soil), or no significant impact (red soil, brick red soil). A stepwise multiple regression analysis was used to establish a predictive model for the determination of the correlation between Hg bioconcentration factor (BCF) and soil properties such as pH, organic matter (OM), cation exchange capacity (CEC), total nitrogen (TN), total potassium (TK)and ironaluminum oxides. The predictive model shows that pH and OM are the two most important factors that affect the transfer of Hg from soil to Brassica chinensis. |
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