武汉市新城区菜地土壤重金属含量状况及污染评价.docVIP

武汉市新城区菜地土壤重金属含量状况及污染评价 　　摘要：为了了解武汉市新城区蔬菜种植基地土壤重金属含量状况，对其主要种植区（黄陂区）的土壤进行了取样调查，测定土壤中As、Hg、Cd、Cr、Cu、Ni、Pb和Zn 8种重金属的含量，以国家土壤环境质量二级标准作为基准值，采用单因子污染指数和内梅罗综合污染指数对其进行了评价。结果表明，黄陂区菜地各项土壤重金属含量变幅均较大；采用单因子污染指数法对调查区土壤进行评价，结果显示As、Cr、Pb、Zn均处于清洁水平，Cu、Ni、Cd、Hg的超标率依次为5.20%、0.58%、15.61%、2.90%，Hg和Cd的污染普遍性及污染程度都是最大的，评价指数分别达4.47和10.94；采用内梅罗综合指数法进行评价，结果显示调查区域有10.40%的土壤处于污染水平，大部分土壤处于清洁水平。对土壤重金属与pH进行了相关性分析，结果表明Ni、As含量与pH呈极显著正相关；Pb、Hg含量与pH呈极显著负相关。 　　关键词：菜地土壤；重金属；污染评价；武汉市城区 　　中图分类号：X53 文献标识码：A 文章编号：0439-8114（2017）01-0043-04 　　DOI：10.14088/j.cnki.issn0439-8114.2017.01.012 　　Analysis and Assessment on Heavy Metal Contents of Vegetable Plantation Soils in New Urban District of Wuhan 　　GUO Cui-ying1，2，WANG Su-ping2，CHEN Gang2，HONG Juan1，2，HUANG Xiang2，DU Lei2，LIAN Zhi-cheng2 　　（1.College of Resources and Environment，Huazhong Agricultural University，Wuhan 430070，China； 　　2.Institute of Crop Sciences，WAAST，Wuhan 430345，China） 　　Abstract： To understand the situation of heavy mental pollution in Wuhan vegetable soil， some soil samples were conducted in the main vegetable bases（Huangpi region） of Wuhan， the contents of As， Hg， Cd， Cr， Cu， Ni， Pb， Zn in soil were measured， and pollution risk was assessed by single cumulative index method and Nemerow pollution index method. The results showed that the variation range of the heavy metal content of vegetable plantation soils was large. The results of pollution risk evaluated by single cumulative index indicated that the contents of As， Cr， Pb and Zn were at the level of security， but Cu， Ni， Cd and Hg were higher than standard， the percentage was 5.20%，0.58%，15.61%，2.89% respectively， and pollution levels of Hg and Cd were the biggest， the evaluation index were 4.47 and 10.94. The results of pollution risk evaluated by Nemerow pollution index showed that， only 10.40% of the soil were in the pollution level， so， most soil of the vegetable plantation was safe level. In addition， Ni content and As content were significantly positively related with pH