The Sources Apportionment of Heavy Metal Pollution Base on Tree Ring in Jinan

Heavy metal pollution is becoming a growing global problem in Jinan, tree is a useful bio indicators which record annual impressions of the pollution environment. With the economic development in 80s to 90s, higher value of Pb, Cd, Mn and Cr contamination in tree rings are close relate to pollution emissions of a large number of serious pollution small and medium-sized enterprise, last century, higher value of Pb contamination of JQ sample point, near the outer ring road, is closely related to rapidly increased traffic capacity, At the beginning of this century, As nutrient element of plant, Mn, Ca are higher in juvenile stage and no obvious fluctuation in other stage because of young-age effect of trees, After correlation analysis and principal component analysis, found that coal, iron and steel smelting, cement production and motor vehicle exhaust emission are main contributor of heavy metal pollution both in SZ point and JQ point.