摘要
为了解临安市雷竹林土壤重金属污染特征,采集并测定了160个土壤样品的Hg、As、Cu、Pb、Zn、Cd、Cr、Ni、Co、Mn等重金属含量,采用单因子污染指数和内梅罗综合污染指数对雷竹林土壤重金属污染程度进行分析,并应用Hankanson潜在生态风险指数法对雷竹林土壤重金属潜在生态风险进行评价.结果表明:雷竹林土壤重金属Hg、As、Cu、Pb、Zn、Cd、Cr、Ni、Co、Mn的平均含量分别为0.16、7.41、34.36、87.98、103.98、0.26、59.12、29.56、11.44、350.26 mg·kg-1,Pb、Cd、Zn和Cu平均值超过浙江省土壤背景值,分别是对应背景值的2.89、1.70、1.12、1.12倍.经单因子污染指数评价,不同重金属元素的平均污染程度大小依次为Pb>Cd>Cu=Zn>Hg>As>Ni>Co>Cr>Mn,其中Pb有中度污染,Cd、Cu和Zn有轻度污染.经内梅罗综合污染指数评价,160个样点都受到不同程度的重金属污染,轻度污染、中度污染和重度污染水平所占比率分别为55.6%、29.4%和15.0%.各重金属单因子潜在生态风险指数平均值评价结果显示,只有Cd污染达到中等生态风险,其他重金属均为轻微生态风险,而局部采样点Cd和Hg单因子潜在生态风险指数最大值分别达到256.82和187.33,存在很强生态风险.重金属综合因子潜在生态风险指数评价结果表明,临安市雷竹林土壤整体上存在轻微生态风险.
An investigation was carried out in an attempt to reveal the characteristics of heavy metals contamination in the soils of Phyllostachys praecox forest in Lin＇ an. Based on the concentra- tions of Hg, As, Cu, Pb, Zn, Cd, Cr, Ni, Co and Mn in 160 topsoil samples, the pollution status and ecological risks of heavy metals in the soils were assessed by single factor pollution index, Neme- row integrated pollution index and Hankanson potential ecological risk index. The spatial variability of heavy metal concentrations in the soils closely related to the distribution of traffic, industrial and livestock pollution sources. The average concentrations of Hg, As, Cu, Pb, Zn, Cd, Cr, Ni, Co and Mn in the soils were 0.16, 7.41, 34.36, 87.98, 103.98, 0.26, 59.12, 29.56, 11.44 and 350.26 mg · kg-1, respectively. Pb, Cd, Zn and Cu concentrations were as 2.89, 1.70, 1.12 and 1.12 times as the background values of soil in Zhejiang Province, respectively. But their concentra- tions were all lower than the threshold values of the National Environmental Quality Standard for Soil （ GB 15618-1995 ）. The average single factor pollution index revealed that the level of heavy metal pollution in the soils was in order of Pb〉Cd〉Cu = Zn〉Hg〉As〉Ni〉Co〉Cr〉Mn. Pb pollution was of moderate level while Cd, Cu and Zn pollutions were slight. There was no soil pollution caused by the other heavy metals. However, the Nemerow integrated pollution index showed that all the 160 soil samples were contaminated by heavy metals to a certain extent. Among total 160 soil samples, slight pollution level, moderate pollution level and heavy pollution level accounted for 55.6%, 29.4% and 15.0%, respectively. The average single factor potential ecological risk index （Ei） im- plied that the potential ecological risk related to Cd reached moderate level, while the others were of slight level. Furthermore, Cd and Hg showed higher potential ecological risk indices which reached up to 256.82 and 187.33 respectively, indicating Cd and Hg had a strong ecological risk and there- fore might pose the most serious ecological risk in the soils of P. praecox standsin Lin＇ an. In addi- tion, the integrated factor potential ecological risk analysis suggested a slight risk to local ecosystem originated from heavy metal contamination in the soils of P. praecox stands in Lin＇ an.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第6期1883-1891,共9页
Chinese Journal of Applied Ecology
基金
杭州市社会发展科研专项(20110533B08)
浙江农林大学人才启动项目
浙江农林大学发展基金预研项目(2010FK042)
杭州市重大科技创新项目(20122513A05)资助
关键词
雷竹林
潜在生态风险指数
单因子污染指数
内梅罗综合污染指数
Hyllostachys praecox
potential ecological risk index
single factor pollution index
Nemerow integrated pollution index.
作者简介
方晓波，男，1978年生，博士，讲师．主要从事环境规划与管理等研究．E—mail：fangxb@zafu．edu．cn
通讯作者．E-mail：sunlip1106@163．com
