DISTRIBUTION OF CD, PB, AND ZN IN ABOVE GROUND PARTS OF A 55-YEAR-OLDSPRUCE TREE (PICEA-ABIES [L.] KARST.)

Concentrations and total quantities of Cd, Pbl and, Zn were determined in a Norway spruce tree (Picea abies [L.] KARST.) grown in the northw estern part of Germany. Above ground parts of the tree were harvested completely and were separated into needles, stem wood, branch wood, st em back, and branch bark. The total dry matter of these parts its well as their element concentrations were measured, From element concentra tions and the biomass distribution, quantities of the elements in diff erent parts of the tree were calculated. In the above ground portion o f the tree total element quantities were 0.31 g Cd, 0.92 g Pb, and 9.4 7 g Zn. The wood of stem and branches was a major storage pool for Cd, containing 87 % of the total above ground Cd of the tree, In the case of Pb, 43 % were found in wood and 46 % in bark. Also Zn was more eve nly distributed; 52 % were stored in wood and 43 % in bark. Needles co ntained only small portions of the metals, rangng from 3.2 % of Cd to 10.9 % of Pb, The total element quantities of the tree were projected on the level of the whole spruce stand, Based on an estimated number o f 1150-1330 trees per hectare the calculated element quantities in the above ground tree biomass were 357-412 g Cd ha(-1), 1058-1224 g Pb ha (-1) and 10891-12595 g Zn ha(-1).