贵州典型何首乌种植基地土壤重金属含量及污染评价

Evaluation on the Content of Heavy Metal in Soil of the Typical Location of Polygonum Multiflorum in Guizhou

  • 摘要: 对都匀市王司镇中药材种植基地和施秉县双井镇龙塘村何首乌种植基地的土壤进行测定,对何首乌种植基地土壤重金属含量及其单项污染指数和综合污染指数进行了分析评价.结果表明:都匀何首乌种植基地土壤pH平均值为5.5,施秉种植基地pH平均值为6.29,两地平均值为5.73,为酸性土壤;都匀何首乌种植基地土壤中,Cu、Zn、Co、As、Cr、Cd、Pb、Hg的平均值分别为52.82、202.70、10.49、31.45、80.80、0.48、64.34、0.39 mg/kg,重金属污染情况Cd > Hg > Pb > As > Zn > Cr > Cu > Co;施秉何首乌种植基地土壤中,Cu、Zn、Co、As、Cr、Cd、Pb、Hg的平均值分别为13.65、65.31、7.08、23.19、61.21、0.35、32.37、0.06 mg/kg,重金属污染情况为Cd > As > Pb > Cr > Zn > Co > Hg > Cu;都匀和施秉种植基地的土壤重金属内梅罗污染指数分别为1.41和0.89.都匀种植基地有轻度污染,施秉种植基地尚清洁.在两种植基地重金属污染因子中,重金属Cu、Co、Cr均未超标,Cd都是最主要的污染物.

     

    Abstract: The content of heavy metal in soil of the planting bases of Polygonum multiflorum as well as single pollution index and comprehensive pollution index were analyzed and evaluated based on soil testing of the two typical planting bases of Polygonum multiflorum in Guizhou——Chinese herb planting base in Wangsi town in Duyun city and the Polygonum multiflorum planting base in Longtang village in Shuangjing town, Shibing county. The results showed the average pH of soil in Duyun Polygonum multiflorum planting base was 5.5 while that in Shibing Polygonum multiflorum planting base 6.29, the average of the two pH being 5,73. The soil of these two bases were acid. For the former base, the average value of Cu、Zn、Co、As、Cr、Cd、Pb and Hg in soil were respectively 52.82, 202.70, 10.49, 31.45, 80.80, 0.48, 64.34 and 0.39 mg/kg and the heavy metal pollution condition is Cd > Hg > Pb > As > Zn > Cr > Cu > Co while for the later base, that of Cu、Zn、Co、As、Cr、Cd、Pb and Hg respectively 13.65, 65.31, 7.08, 23.19, 61.21, 0.35, 32.37 and 0.06 mg/kg and the heavy metal pollution condition Cd > As > Pb > Cr > Zn > Co > Hg > Cu.The Nemerow pollution index for evaluating the heavy metal pollution of soil in Duyun planting base and Shibing planting base respectively are 1.41 and 0.89, showing the former base is of the mild pollution and the later one still free of pollution. Among the heavy metal pollution factors of soil in these two bases, Cu、Co and Cr don't exceed the allowed standards and Cd is the most prevalent contaminant.

     

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