Beziehungen von Schwermetallgehalten in Böden und Eibennadeln städtischer Standorte

Abstract

At 44 urban habitats (enclosed three park-sites) and two control sites in forests near Darmstadt we examined the contents of the heavy-metals Pb, Cu, Cd, Ni, Cr and Hg as well in the soils as in the needles of Taxus baccata L Furthermore we tested p H-values, CaCO 3 -contents, and organic substances of the soils. CaCO 3 -contents and p H-values are higher at urban habitats than at the controls, whereas the organic substances resulted maximum values at the controls. Although all heavy-metals (except Ni) reach high concentrations in the soils of urban area, this is not true for the needles of Taxus baccata . Only Pb, Cu and Cr are reaching higher concentrations here, but Cd, and Ni are showing maximum levels at the control sites. A statistical analysis resulted no significant correlation between the heavy-metal-contents of the soils, and the corresponding metals of the needles. There exists a negative-significant correlation between the p H-value of the soils, and the Cd-content of the needles (α < 0.05), and a positive correlation (α < 0,05) between organic substances of the soils and Cd- and Hg-content of the needles. Soils seem to be long-term-indicators for heavy-metal contamination while the needles of Taxus baccata cover about two-year-periods.