金华市郊杂草对土壤重金属元素的吸收与富集作用(Ⅱ)-杂草-土壤间重金属元素关系的主成分分析

通过对金华市郊土壤－杂草中Cd,Cr,Cu,Mn,Pb和Zn6种重金属元素含量的主成分分析（Principal Component Analysis,PCA)表明：（1）土壤与杂草体内6种重金属元素具有较高的相关性，在6种元素之间，Cr,Cd,Pb,Cu在含量上的相关性较大，而Zn,Mn的相关性较低；（2）在不同的杂草与土壤样品中，均以Mn,Zn的含量差异最为显著；（3） PCA排序图能够定量直观地反映出样点，杂草在6种重金属元素组成上的相似性，也反映出元素组成差异所形成的杂草生态类群与局部区域土壤元素差异的对应性。

On absorption and accumulation of six heavy metal elements of weeds in Jinhua suburb (Ⅱ)-PCA on relationship between weeds and soil in metal element content

The contents of six heavy metal elements including Mn,Zn,Cr,Cu,Pb and Cd in 51 weed samples and 33 sites collected from Jinhua suburb were studied by PCA(Principal Component Analysis,PCA). The results are as follows:(1)Obvious correlation among the concentrations of metal elements in soil and those in weeds was revealed in the PCA ordination plots;(2)Among the six elements, the concentration differences of Mn and Zn are highest both in weeds and soil;(3)PCA ordination plot could directly reveal the similarities of the element contents in sites and weeds, and also reveal the correspondence of the ecological groups of weeds in relation to the concentration of elements in sites.