Dynamic Variation And Accumulation Characteristics Of Heavy Metals In Four Coniferous Tree Boles In Harbin City

To invest the concentration dynamic and the homology of correlation of heavy metals, the transfer and accumulation ability of trees, the concentration of Mn, Zn, Cu, Cr, Pb, Cd, Hg, Ag and As at different height(base, breast,1/2height and3/4height) of four species of coniferous trees(Lg:Larix gmelinii, Ps:Pinus sylvestrisvar. Mongolica, Pt:Pinus tabulaeformis var. mukd ensis, Pk:Picea asperata Mast) established in the Uthan Forestry Demonstration Researeh Base of Northeast Forestry University in the1950were collected and analysed.The results suggested:1. The concentrations of heavy metals in tree rings were increased with time as a whole, most of maximum values were in2000-2007, followed by in1990-1999. In addition to the ma-ximum amplitude of Zn in Pa was6.3and located in base of tree, the maximum amplitude at breast,1/2height and3/4height was Mn in Lg and respectively was12.1,11.6and4.9.2. Except that Pb and As(except for Ps) was concentrated in the base part of trees, the con-centrations of Hg in Lg, Mn, Cu, Cr in Ps, Mn and Cd in Pt at different height vere increased with the height, Ag in Lg, Zn, Hg and As in Ps was decreased with the height, other was in wave. The transfer ratio of Mn in Lg, Ps, Pk and Pt was the highest(maximum:19.06) and in order with Lg>Ps>Pt>Pk.3. Accumulation ratio of Hg was highest. Lg accumulated the most Mn, Cu, Cr and Cd, as Pk accumulated the most Zn, Pb and As. The order of accumulation ratio for heavy metals of Lg was Hg>Cd>Mn>Cu>Zn>Pb>Cr>As, that of Ps, Pt and Pk res-pectively was Hg>Cd>Zn>Cu=Pb>Mn>Cr=As, Hg>Cd>Zn>Cu>Pb>Mn>As=Cr, Cd>Hg>Zn>Mn>Pb>Cu=As>Cr.The order of accumulated heavy metals amount in Lg was Mn>Zn>Cu>Pb>Cr>Hg>Cd> Ag>As, that of Ps, Pt and Pk respectively was Mn>Zn>Pb>Cu>Cr>Cd>Ag>Hg>As, Mn>Zn> Pb>Cu>Cr>Cd>Hg>Ag>As, Mn>Zn>Pb>Cu>Cr>As>Cd>Ag>Hg.4. The heavy metals content of trees was mainly determined by absorption selectivity but not the growth of trees.5. There is significant positive correlation in Mn, Cd, Zn, Hg and Cr of Lg and the correlat ion index(R) was greater than or equal to0.83. There is significant positive correlation in As an d Cu of Ps and R was0.904. There is significant positive correlation in Cd and Zn of Pt and R was0.94. There is significant positive correlation in Mn, Zn, As, Hg and Cr of Pk and R wa sgreater than or equal to0.95.