Heavy Metal Enrichment Efficiency Of Urban Green Tree Of Cinnamomum Camphora In Different Pollution Degree

In this paper the research object was the urban green trees of Cinnamomum camphora in the city of Yongkang Zhejiang provinces,which was divided into twelve zones based on its survey region in different pollution degree.108 plant oagans samples(leaf,branch,trunk)and 36 plant rhizosphere soil samples were collected,and six kinds of heavy metal element concentration were analyzed by ICP-OES.The absorption and distribution of Cu?Zn?Pb?Cr?Mn and Ni in trees organs were analyzed,and the enrichment of heavy metal of trees organs in different pollution degree are discussed.The study results showed that:(1)Heavy metal concentration in Cinnamomum camphora leaf and branch followed the order of Mn>Zn>Cr>Cu>Pb>Ni,trunk followed the order of Mn>Zn>Cr>Pb>Ni>Cu,and the concentration of Mn in Magnolia Grandiflora Linn.in leaf and the Pb,Cr,Ni in trunk are higher than its in other organs.(2)The heavy metal enrichment coefficient of Cinnamomum camphora followed the order of Mn > Cu > Ni > Zn > Pb > Cr.The enrichment coefficient of Cinnamomum camphora organs were decreased with the increase of the concentration in soils.(3)The total of heavy metal accumulation in different organs of Cinnamomum camphora followed the order of leaf>trunk>branch,respectively of 7920.75 mg,6202.21 mg and 4812.40 mg.The enrichment efficiency of trunk are significantly higher than other organs of Cu,Zn,Pb,Cr,Ni,respectively of the total of heavy metal accumulation 59.72%,61.80%,81.62%,71.09% and 91.89%.(4)Prediction of heavy metal fix in different pollution degree of Cinnamomum camphora.trunk shows that the year of fix heavy metal pollution in Cu,Zn,Mn,Ni follow the 5a/m3,7a/m3,8a/m3,8a/m3,and Pb,Cr longer than others follow the 11a/m3,13a/m3.(5)The single factor evaluation showed the pollution degree of heavy metal in rhizosphere of Cinnamomum camphora.That Cr were moderate pollution class,Cu,Zn,Ni,Pb were light pollution class and Mn were alert class.The enrichment coefficient of Mn,Cu,Cr,Ni were decreased in Cinnamomum camphora.with the increase of the gradient in soil heavy metal pollution degrees,while Zn,Pb were increased with the increase of the gradient.