摘要
通过对雪松(Cedrus deodara)松针Pb、Cu、Zn、Cd等4种重金属含量的测定,分析洛阳市大气重金属污染空间分布状况。从洛阳市居民区、商业区、工业区、风景区等4类采样点,分10～15年生雪松松针(YS),10～15年生雪松地面落针(YD),20～30年生雪松松针(LS),20～30年生雪松落针(LD)等4种类型,采集雪松松针,测定其Pb、Cu、Zn、Cd等4种重金属含量。结果表明:洛阳城区雪松松针Pb、Cu、Zn、Cd平均含量为1.606、3.385、18.151和0.198mg·kg-1;松针类型间Cu和Zn含量差异显著,Pb和Cd含量差异不显著;采样点Pb、Cu和Zn含量差异显著,工业区>居民区>风景区,Cd含量差异不显著;采样点间雪松松针Pb、Cu、Zn含量变化主要受工业生产污染大气排放量和人为活动的影响,其含量值客观地反映出各采样点大气重金属污染状况,雪松可作为城市环境大气重金属污染的指示植物。
Based on the determination of the Pb,Cu,Zn,and Cd concentrations in cedar （Cedrus deodara） needles in Luoyang urban area,this paper analyzed the distribution of these heavy metals in the atmosphere. The needle samples were collected from 10-15 years old trees （YS）,fallen needles of 10-15 years old trees （YD）,20-30 years old trees （LS）,and fallen needles of 20-30 years old trees （LD）,and the sampling sites were at 11 different locations with different degrees of heavy metals air pollution in residential,commercial,industrial,and scenic regions. The mean values of the needles Pb,Cu,Zn,and Cd concentrations in the four regions were 1.606,3.385,18.151,and 0.198 mg·kg-1,respectively. There were significant differences in the Cu and Zn concentrations,but no significant differences in the Pb and Cd concentrations among YS,YD,LS,and LD. The Pb,Cu,and Zn concentrations in the needles differed significantly with sampling sites,and decreased in the order of industrial region commercial and residential region scenic region,while the concentration of Cd had little difference. The spatial variability of test heavy metals in cedar needles was mainly affected by the industrial discharge of the metals,and could objectively indicate the heavy metals air pollution. It was suggested that cedar could be used as the good tree species indicating the heavy metals pollution of urban air environment.
出处
《生态学杂志》
CAS
CSCD
北大核心
2010年第9期1788-1793,共6页
Chinese Journal of Ecology
基金
"十一五"国家科技支撑计划项目(2006BAD03A13)
河南科技大学博士科研基金资助项目(09001445)
关键词
雪松松针
洛阳城区
重金属含量
空间分异
cedar needle
Luoyang urban area
heavy metals concentration
spatial variability.
