| 基于改进物元可拓模型的鄱阳湖区耕地土壤重金属污染评价 |
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| 引用本文： | 赵杰,罗志军,赵弯弯,赵越,宋聚.基于改进物元可拓模型的鄱阳湖区耕地土壤重金属污染评价[J].农业环境科学学报,2019,38(3):521-533. |
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| 作者姓名： | 赵杰 罗志军 赵弯弯 赵越 宋聚 |
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| 作者单位： | 江西农业大学国土资源与环境学院, 南昌 330045;江西省鄱阳湖流域农业资源与生态重点实验室, 南昌 330045,江西农业大学国土资源与环境学院, 南昌 330045;江西省鄱阳湖流域农业资源与生态重点实验室, 南昌 330045,江西农业大学国土资源与环境学院, 南昌 330045;江西省鄱阳湖流域农业资源与生态重点实验室, 南昌 330045,江西农业大学国土资源与环境学院, 南昌 330045;江西省鄱阳湖流域农业资源与生态重点实验室, 南昌 330045,江西农业大学国土资源与环境学院, 南昌 330045;江西省鄱阳湖流域农业资源与生态重点实验室, 南昌 330045 |
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| 基金项目： | 国家自然科学基金项目（41561107）；江西省科技重大专项（20114ABG01100） |
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| 摘 要： | 为了解鄱阳湖区耕地土壤重金属污染状况,采集252个耕地表层土壤样品,分析测定了Hg、As、Pb、Cd、Cu、Cr、Zn7种重金属元素的含量。鉴于土壤重金属污染的模糊性和不确定性,尝试运用物元可拓模型并对其进行改进,同时引入Hakanson毒性响应系数修正传统超标倍数赋权法权重,建立了基于改进物元可拓模型的耕地土壤重金属污染评价模型,并将其评价结果与传统评价方法结果进行对比。结果表明:样品中7种重金属的平均含量均超过当地背景值,并有不同程度累积,超标率CrCuCdHgZnPbAs;运用改进后的物元可拓模型得到的鄱阳湖区耕地土壤重金属总体污染情况为尚清洁状态,都昌县、湖口县、共青城市的污染等级均为清洁级,其余地区均为尚清洁状态;改进物元可拓法与传统评价方法得到的评价结果基本一致,表明改进物元可拓模型在土壤重金属污染评价中同样适用,且更为合理。
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| 关 键 词： | 改进物元可拓模型 耕地土壤 重金属 污染评价 鄱阳湖区 |
| 收稿时间： | 2018/6/3 0:00:00 |
Assessment of heavy metal pollution in arable soils in the Poyang Lake area based on the improved matter-element extension method |
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| ZHAO Jie,LUO Zhi-jun,ZHAO Wan-wan,ZHAO Yue and SONG Ju.Assessment of heavy metal pollution in arable soils in the Poyang Lake area based on the improved matter-element extension method[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2019,38(3):521-533. |
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| Authors: | ZHAO Jie LUO Zhi-jun ZHAO Wan-wan ZHAO Yue and SONG Ju |
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| Institution: | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China;Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China,College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China;Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China,College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China;Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China,College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China;Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China and College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China;Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China |
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| Abstract: | To examine the contamination status of heavy metals in arable soils in the Poyang Lake area, a total of 252 top soil samples were collected from this area. Contents of the heavy metals Hg, As, Pb, Cd, Cu, Cr and Zn were determined using standard methods. Taking into consideration the fuzziness and uncertainty of soil heavy metal pollution, we used the improved matter-element extension model to assess soil heavy metal pollution. We also applied Hakanson toxic response coefficients to modify the weights determined by the traditional multiple super-scale weighting method. Having thus established an assessment model for heavy metal pollution in arable soils based on the improved matter-element extension model, we compared the evaluation results with the results obtained using traditional evaluation methods. We accordingly found that the average contents of the seven examined heavy metals in soil samples exceeded the local background values, and accumulated to different degrees, with the order of over-standard rates being Cr > Cu > Cd > Hg > Zn > Pb > As. On the basis of the results obtained using the improved matter-element extension model, we could conclude that the heavy metal contamination of soil in the Poyang Lake area was generally at a safe level. The heavy metal content in soils from Duchang County, Hukou County, and Gongqingcheng City was at a safe level, whereas that of soils from other areas was at alert level. The evaluation results obtained using the improved matter-element extension model were essentially consistent with those obtained using the traditional evaluation methods, thereby indicating that the improved matter-element extension model can be applied for the evaluation of soil heavy metal pollution and yields reliable results. |
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| Keywords: | improved matter-element extension model arable soil heavy metal pollution assessment Poyang Lake area |
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