Toxic components of motor vehicle emissions for the spruce Picea abies.
Six-year-old Norway spruce trees were exposed for 30 min under standardised conditions to the exhaust from an Otto engine running on lead-free petrol. Gas-exchange measurements in an open system using an infrared gas analyser showed a sudden, severe drop in CO(2) assimilation and transpiration rates. By using filters which absorbed different fractions of the exhaust it could be demonstrated that the toxic effects can be attributed to the NO(x) fraction.
Kammerbauer
H
H
Department of Botany, Technical University of Munich, D-8050 Freising 12, Federal Republic of Germany.
Selinger
H
H
Römmelt
R
R
Ziegler-Jöns
A
A
Knoppik
D
D
Hock
B
B