Single and combined effects of lead and cadmium on young bech trees (Fagus sivatica L.) : Air Pollution and Forest Decline. 14th International Meeting for Specialists in Air Pollution Effects on Forest Ecosystems

1989

1 Tab., 20 Lit. Ang., En, Zfsg. En

Unselbständiges Werk

9091

200034773

Based on several dose response experiments the toxicity of root-applied Pb and Cd for young plants of Fagus silvatica was evaluated. Considering root elongation of seedlings as a rather sensitive parameter, available soil concentrations of 24 ppm Pb and 3 ppm Cd must be regarded as "critical" concerning depression of root growth. Effects on growth and mineral nutrition in young beech trees shown during three vegetation periods in sand culture indicated that threshold concentrations in the long term aspect are even lower than 20 ppm Rb and 1 ppm Cd, eskpecially when applied in combination. Thus, presentday levels of Pb and 1 ppm Cd, especially when applied in combination. Thus, presentday levels of Pb and Cd accumulated in forest soils are sufficiently high to affect germination and growth of saplings. Both metals must be taken into account as a possible contributing factor to forest dieback at acidified stands.