承德木本植物不同部位S及重金属含量特征的PCA分析

PCA analysis on sulphur and heavy metals contents in different parts of woody species in Chengde of North China

应用主分量分析（ＰＣＡ）和排序技术（ＯＡ）对承德市１０种木本植物的Ｓ及重金属含量进行了分析．结果表明，Ｚ１和Ｚ２主成份值基本代表了所有元素反应的信息，累积贡献率＞９８％．Ｓ对Ｚ１贡献最大（元素负荷量＞０．９６），Ｆｅ、Ｚｎ、Ｍｎ、Ｐｈ等对Ｚ２有较大的影响．表明承德市Ｓ污染是最主要的；重金属污染以Ｚｎ、Ｆｅ、Ｍｎ、Ｐｈ较显著，而Ｃｕ、Ｎｉ污染不明显．不同植物器官部位污染物含量的排序表明，城市木本植物的污染物以树皮为最高，其次是枝条，叶最低．

Principal component analysis(PCA) and ordination analysis(OA)on sulphur and heavy metal contents of 10 woody species in Chengde show that components Z1 and Z2 can mainly represent most of information reflected by 7 elements analysed,with an accumulative rate of >98%.Sulphur has a largest contribution to Z1,while Fe,Zn,Mn and Pb have a stronger influence to Z2.It is indicated that in the urban area of Chengde,sulphur pollution is most remarkable.Among heavy metals,Zn,Fe,Mn and Ph are serious pollutants, while Cu and Ni are not.In different parts of woody species,bark is most seriously polluted,twig is the second,and leaf is the lowest.