摘要
以尉氏桃园为研究对象,对桃园土壤重金属来源进行污染评价及来源解析.通过对表层土壤中4种重金属(Cr、Pb、Zn、As)主成分分析,探讨桃园的土壤重金属形成原因,以无公害果园产地的土壤环境质量标准为依据,应用单因子污染指数法对土壤环境质量进行评价.分析结果表明,研究区重金属元素Cr的含量超出标准限值,且部分样点达到中度污染,此土壤环境质量不符合无公害水果生产的土壤环境质量标准,应给予严格的控制和治理.另外个别样点中类金属元素As的单项污染指数超出了0.7,达到了警戒限状态.主成分分析结果表明,土壤中4种重金属的富集原因存在差异,其中重金属As和Cr主要源于化肥、农药、有机肥的过量施用以及灌溉用水受污染;Zn和Pb主要源于粉尘及汽车轮胎磨损所产生有害气体中的重金属.
This study aimed to investigate the pollution degree and source apportionment of heavy metals in peachorchard soil. On the basis of soil environmental quality standard of nuisanceless orchard origin,Pb,Cr,As and Znwas conducted using principal component analysis（PCA）for the source investigation of soil heavy metal. Single factorindex method were used to evaluate the soil environment quality. The average content of Cr in peach orchard soil werehigher than the standard limit value,and the single factor index of soil heavy metal Cr in some sampling area reachedthe moderate pollution levels. The soil environmental quality doesn＇t live up to the standard of soil environmentalquality pollution-free fruit production. It should be controlled and governed. In addition,single pollution index ofthe metalloid element As exceeded 0.7 and reached the alert limit. The principal component analysis showed thatthere were obvious accumulations of these heavy metals in surface soils. The heavy metals As and Cr mainly comesfrom chemical fertilizer and pesticide,fertilizer application and irrigation water pollution;The source of Zn and Pbmay be affected by a large number of harmful gas and dust emitted from vehicle and automobile tire wear.
出处
《河南科学》
2017年第9期1432-1438,共7页
Henan Science
基金
国家科技支撑计划课题(2013BAD01B06)
国家大学生创新创业训练计划(1402103020)
关键词
桃园
土壤重金属污染
单因子污染指数
主成分分析
peach orchard
heavy metals pollution of soil
single factor pollution index
principal component analysis
