| 杭州市郊蔬菜基地土壤和蔬菜中Pb、Zn和Cu含量的环境质量评价 |
| 摘要点击 2671 全文点击 1589 投稿时间：2005-06-15 修订日期：2005-08-22 |
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| 中文关键词 土壤 蔬菜 重金属 GIS 评价 富集系数 |
| 英文关键词 soil vegetable heavy metal GIS evaluation accumulation coefficient |
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| 中文摘要 |
| 对杭州市4个蔬菜基地土壤中Pb、Zn、Cu进行测定分析,利用不同的评价方法和标准来评价土壤重金属的环境质量状况,并在GIS软件平台下,通过克里格插值法分析了江干区蔬菜基地土壤-蔬菜重金属含量空间分布特征.结果发现蔬菜基地土壤中重金属含量超过自然背景值,未超过以国家土壤重金属环境质量标准,是符合无公害蔬菜基地的要求的;4个调查区中拱墅区土壤中重金属含量大于其它3区;江干区蔬菜基地土壤-蔬菜中重金属的空间变异很大;小白菜/小青菜中Zn和Cu的含量未超标,Pb则超标;2种蔬菜的富集系数均是Zn>Pb>Cu,小青菜Pb、Zn、Cu的富集系数和含量均大于小白菜,更易受到土壤中重金属的影响. |
| 英文摘要 |
| Contents of heavy metals(Pb,Zn,Cu) in soils from 4 main vegetable plantations in Hangzhou suburb were investigated to evaluate environmental quality of heavy metals of soils and vegetables.Different evaluation methods and evaluation standards of heavy metals were used for comparison.Kriging method was applied to study the spatial variability of heavy metals in soil-vegetable system. The distribution maps of the spatial variability of heavy metals in soil-vegetable system in Jianggan District were obtained based on GIS method.The results show that the soils were polluted with Pb,Zn,and Cu using natural background values as evaluation standard.While using National Standard as evaluation standard,the soils were not polluted.Contents of heavy metals in Gongshu District were the highest of four investigated districts.The concentration distribution of heavy metals had different spatial variability.The content of Pb in vegetables was higher than those of Zn and Cu and exceeded the national vegetable sanitation standard.The order for their enrichment coefficients was as follows: Zn>Pb>Cu.The accumulation coefficient for green vegetable was higher than that of Chinese cabbage,indicating green vegetable could easily accumulate heavy metals from soils than Chinese cabbage. |
