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| Contents and Sources of Cadmium in Farmland Soils of Chengdu Plain, China |
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| KeyWord:cadmium; soils; risk assessment; influencing factors; Chengdu plain |
| Author Name | Affiliation | | LI Qi-quan | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | ZHANG Shao-yao | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | DAI Tian-fei | Chengdu Testing Center of Soil and Fertilizer, Chengdu 610041, China | | GAO Xue-song | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | ZHANG Xin | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | WANG Chang-quan | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | YUAN Da-gang | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | LI Kun-rong | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China |
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| Abstract: |
| Heavy metal pollution in farmland soils in the Chengdu plain is threatening the security of agricultural products. Here we examined contents and sources of cadmium（Cd） in farmland soils in Chongzhou area of the Chengdu plain. Cadmium contents in the farmland soils ranged from 0.16 mg·kg-1 to 0.77 mg·kg-1, with an average of 0.33 mg·kg-1, which exceeded the GradeⅡ limit of the National Soil Environmental Quality Standard（GB 15618—1995）. There were 30.43% of soil samples in which Cd contents exceeded the standard. Assessments of potential ecological and human health risks indicated that Cd in the soils had moderate potential ecological risk. The carcinogenic risks of Cd in these soils were within the acceptable range, which showed a range from 5.67E-07 to 2.77E-06 for adult and from 1.42E-06 to 6.93E-06 for children. Agricultural land uses, parent materials, soil types, rivers and highways respectively contributed to 12.62%, 20.71%, 24.70%, 25.68% and 10.58% of soil Cd variability. This implied that both natural geological and human activity factors determined the heterogeneity of soil Cd, with natural geological factors playing greater roles. Rivers and highways had impacts on soil Cd up to 4.0 km and 1.5 km, respectively. In soils more than 4 km away from rivers, agricultural land use became a dominant factor affecting soil Cd. These findings provide useful information about understanding of soil Cd pollution and sources in the farmland of the Chengdu plain. |
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