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| Ecological Hazard Concentration（HC5） of Cadmium（Cd） to Rice Cultivars Under Hydroponic Culture as Determined with Species Sensitivity Distribution Model（Burr-Ⅲ） |
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| KeyWord:Burr-Ⅲ model; cadmium; rice cultivars; phytotoxicity; ecological hazard concentration（HC5）; species sensitivity distributions（SSD） |
| Author Name | Affiliation | | SUN Cong | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 | | CHEN Shi-bao | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 | | MA Yi-bing | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 | | LIU Ji-fang | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 |
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| Abstract: |
| Burr type Ⅲ distribution is a continuous distribution model and could best describe species sensitivity distributions（SSD） of chemical pollutants to organisms. A hydroponic culture experiment was conducted to investigate dose-responses of cadmium（Cd） to 17 different rice cultivars. Bur-Ⅲ was employed to determine ecological hazard concentrations（HC5: protection of 95% rice species） of Cd to rice cultivars. With increasing Cd levels（0.30 mg·L-1 to 6.0 mg·L-1）, biologic concentration factors（BCFs） of Cd to rice species generally decreased, while transfer factors（TFs） of Cd increased. Higher TFs of Cd were found in hybrid rice than in traditional rice cultivars. Effective concentration（EC50） of Cd at 50% inhibition of rice responses ranged from 0.552~24.01 mg·L-1 in solution, and EC10 from 0.033~1.624 mg·L-1. The Burr-Ⅲ model predicted that HC510% of Cd at 10% inhibition was 0.045 mg·L-1 and HC550% was 0.594 mg·L-1. These results provide useful information for ecological risk assessment of Cd to rice. |
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