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| Ecological Risk Assessment of Heavy Metals of Pb and Cd in the Suburban Cropland Soils in Changsha |
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| KeyWord:agricultural soil; heavy metal; Pb; Cd; ecological risk assessment |
| Author Name | Affiliation | | LIU Qiong-feng | Soil and Fertilizer Institute of Hunan Province；College of Resource and Environment, Hunan Agricultural University | | LI Ming-de | Soil and Fertilizer Institute of Hunan Province | | DUAN Jian-nan | College of Resource and Environment, Hunan Agricultural University | | WEI Wen-xue | Institute of Subtropical Agriculture,the Chinese Academy of Sciences | | WU Hai-yong | Soil and Fertilizer Institute of Hunan Province |
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| Abstract: |
| The purpose of this study was to assess the ecological risk of heavy metals Pb and Cd in suburban agricultural soils in Changsha, the capital city of Hunan Province. A total of 513 surface soil samples（0~20 cm） were collected from paddy fields and upland covering whole city region, and the concentrations of Pb and Cd were analyzed. Fuzzy comprehensive evaluation and analytic hierarchy process were applied to establish ecological risk assessment models of Pb and Cd contamination, and evaluation indics（ERI） were set up based on Pb and Cd concentrations, soil physicochemical properties and soil location characteristics. The indics of soil physicochemical properties were soil pH, organic matter, alkali-hydro nitrogen and available phosphorus, while the indics of soil location characteristics were the distance from cropland to town, industrial construction land, river, and settlement. The ecological risk grade was divided to four ranks according to the values of ecological risk index, ERI>0.70, 0.6 |
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